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Nonlinear Stress Relaxation of End-associative Hydrophobically Modified Ethoxylated Urethane(HEUR)Solutions under Step Strain 认领 引用 被引量：1
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作者 Yu-Xuan Pei Quan Chen Hiroshi Watanabe 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第6期1790-1803,I0014,共14页
Nonlinear stress relaxation under step strainγwas examined for aqueous solutions of an end-associative telechelic polymer,hydrophobically modified ethoxylated urethane(HEUR)having hexadecyl groups at the two ends of ... Nonlinear stress relaxation under step strainγwas examined for aqueous solutions of an end-associative telechelic polymer,hydrophobically modified ethoxylated urethane(HEUR)having hexadecyl groups at the two ends of the chain.At 20℃ where the end hexadecyl groups were in the molten liquid state,the solutions with the HEUR concentrations c=1 wt%and 5 wt%commonly exhibited strain-hardening at short time t and the strain-softening(damping)at long t.In the terminal relaxation zone at sufficiently long t,the nonlinear relaxation modulus G(t,γ)was found to obey the time-strain separability.These nonlinear features were discussed in relation to strain-induced changes in the associative network structure.In the aqueous HEUR solutions,aggregates of the precipitated end-groups should be stabilized by loops of dissolved HEUR backbones to form so-called flower micelles.At low c,most of those micelles would connect HEUR chains into a long linear sequence referred to as superbridge,thereby forming a sparse network.At higher c,those superbridges would become shorter to densify the network accordingly.Immediately after imposition of the large step strain,the flower micelles in the superbridge backbone would fuse each other to form a denser network thereby exhibiting the hardening.This micelle fusion would be more significant for longer superbridges to enhance the strain hardening at lower c.After this fusion,the micelles having liquid cores would be opened up because of the enhanced tension of the deformed superbridge,and then split to disconnect the superbridge if this tension overwhelms the micelle strength.This opening/splitting process possibly resulted in the partial breakage of the network and the corresponding softening.Finally,the surviving part of the network would relax on thermal dissociation of the remaining micelles thereby exhibiting the time-strain separable damping at long t.These features were semi-quantitatively described by a simple model that considered the strain-induced fusion followed by mechanical opening/breakage of the transient crosslinks. 展开更多
关键词 Telechelic polymer Nonlinear stress relaxation Strain hardening Strain softening Time-strain separability
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Electrically controlled strain tuning of spin defects in a hybrid 4H-silicon carbide-on-lithium niobate integrated platform 认领 引用
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作者 BINGCHENG YANG YUANHAO QIN +10 位作者 BOWEN CHEN XUQIANG WANG WEIRAN ZHOU TIANYAO YANG JIAN ZHANG XINJIAN KE MIN ZHOU CHENGLI WANG AILUN YI JIAXIANG ZHANG XIN OU 《Photonics Research》 SCIE EI CAS CSCD 2026年第6期2389-2396,共8页
We realized a wafer-scale hybrid quantum platform by integrating 4H-silicon carbide(SiC)thin films with lithium niobate-on-insulator(LNOI)substrates.Wafer bonding combined with precision grinding established a void-fr... We realized a wafer-scale hybrid quantum platform by integrating 4H-silicon carbide(SiC)thin films with lithium niobate-on-insulator(LNOI)substrates.Wafer bonding combined with precision grinding established a void-free interface to harness the strong piezoelectric response of LN for efficient strain transfer.By generating controlled local strain via surface electrodes,the optically detected magnetic resonance(ODMR)frequency of the negatively charged silicon vacancy(V2)centers was tuned by 1.36 MHz.The applied strain significantly enhanced spin properties,improving the spin readout contrast by roughly 30%while increasing the inhomogeneous dephasing time(T2*)by 75%and the intrinsic coherence time(T2)by nearly 50%.These results position the 4HSiC-on-LNOI architecture as an integrable and strain-controllable platform for high-sensitivity quantum sensing applications. 展开更多
关键词 piezoelectric response generating controlled local strain detected magnetic efficient strain transferby electrically controlled strain tuning spin defects quantum platform precision grinding
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Anisotropic Strain at Atomic Steps in SnTe(111)/Au(111)Heterostructures Revealed by Moire Superlattices 认领 引用
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作者 Rui-Qi Cao Jeison Fischer +2 位作者 Dirk Sander Stuart S.P.Parkin Kai Chang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期113-118,共6页
Topological crystalline insulator SnTe(111)thin films offer a promising platform for strain-engineered topological phases and proximityinduced superconductivity,yet their structural response to local strain remains po... Topological crystalline insulator SnTe(111)thin films offer a promising platform for strain-engineered topological phases and proximityinduced superconductivity,yet their structural response to local strain remains poorly understood.Here,we use scanning tunneling microscopy to investigate the strain landscape of SnTe(111)films grown on Au(111).We observe a coexistence of pristine and(3×3)reconstructed surfaces,along with a spontaneously formed moirésuperlattice originating from interlayer twist between adjacent SnTe layers.Remarkably,the moiréperiod exhibits pronounced spatial variations near atomic steps on both SnTe and Au(111)surfaces.Quantitative strain mapping reveals a strain gradient of up to several percent that develops primarily perpendicular to the step direction,while the parallel component remains uniform.These findings establish the moirésuperlattice as a sensitive local probe of anisotropic strain and identify few-layer SnTe(111)as a highly strain-tunable van der Waals system.Our work provides a pathway toward strain engineering of topological surface states and the design of SnTe-based quantum devices. 展开更多
关键词 local strain strain landscape proximityinduced superconductivityyet topological crystalline insulator interlayer twist spontaneously formed scanning tunneling microscopy anisotropic strain
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Self-correction-iterative method enabled 15,000μεultra-large dynamic range distributed strain sensing system 认领 引用
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作者 TENGHUA AI CUNZHENG FAN +4 位作者 YUEJUAN LV WEILIANG ZHAO HAO LI ZHIJUN YAN QIZHEN SUN 《Photonics Research》 SCIE EI CAS CSCD 2026年第6期2553-2563,共11页
Distributed optical fiber strain sensors based on optical frequency domain reflectometry(OFDR)are increasingly utilized in applications including medical diagnostics and geological exploration,where both high spatial ... Distributed optical fiber strain sensors based on optical frequency domain reflectometry(OFDR)are increasingly utilized in applications including medical diagnostics and geological exploration,where both high spatial resolution and a large strain measurement range are required.However,the performance of OFDR is limited by positional and spectral mismatches,resulting in an inherent trade-off between the dynamic range and spatial resolution.Here,a distributed strain sensing system with an ultra-large dynamic range is proposed.By introducing the self-correction-iterative algorithm for high-precision positional compensation,the system achieves high spatial resolution and an ultra-large strain measurement range simultaneously.In addition,an active contour model is employed to nondestructively extract the strain profile from the position-corrected demodulation image.Experimental results show that the proposed scheme achieves the up to 15,000μεstrain demodulation with a high spatial resolution of 0.8 mm and a relative error of only 0.16%,offering a groundbreaking solution for distributed strain sensing applications that require a large dynamic range and high resolution. 展开更多
关键词 distributed strain sensing system optical frequency domain reflectometry geological explorationwhere optical frequency domain reflectometry ofdr distributed strain sensing self correction iterative method medical diagnostics distributed optical fiber strain sensors
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Decoupling strength-damage trade-offs in additively manufactured alloys via engineered strain gradient 认领 引用
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作者 Jing PENG Hui FENG +2 位作者 Hong WU Jia LI Qihong FANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第5期1041-1064,共24页
The strength and damage tolerance of additively manufactured(AM)alloys are significantly influenced by their heterogeneous microstructures.However,establishing quantitative relationships between these microstructural ... The strength and damage tolerance of additively manufactured(AM)alloys are significantly influenced by their heterogeneous microstructures.However,establishing quantitative relationships between these microstructural characteristics and the resulting mechanical properties remains a challenge.Here,a microstructure-based mechanical model is established based on the heterogeneous grain distribution within the melt pool,with particular emphasis on the strain gradient effect arising from the deformation incompatibility between distinct grain regions.The strengthening mechanisms and local deformation response of AM alloys are elucidated with the finite element method(FEM).The strain gradient effect generated by the deformation incompatibility between the columnar and equiaxed grain regions enhances the local stress near the equiaxed-columnar interface,which is an important reason for the overall work hardening.Concurrently,the local stress concentration makes it easier to reach the critical stress for microcrack nucleation at the interface,leading to failure and a lack of synergy between the strength and damage tolerance.The prediction of the crack initiation location based on the simulation results is consistent with the previous experiments.By further quantitatively predicting the comprehensive effects of melt pool size on strength,strain hardening,and damage rate,small-melt-pool structures produce high strength,but microcracks originate early,whereas large-melt-pool structures have weak strengthening effects but fast damage evolution in the later stages of deformation.This study provides a pathway to predict the optimal melt pool size for achieving superior combinations of strength and damage tolerance in AM alloys. 展开更多
关键词 additive manufacturing strain gradient strain hardening damage tolerance microcrack nucleation
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Independence verification of peak-strength strain energy storage index from rock specimen shape effects 认领 引用
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作者 Zhichao He Fengqiang Gong +2 位作者 Li Ren Da Huang Weimin Yang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3526-3538,共13页
The strain energy storage index(WET)is a crucial index for evaluating rockburst proneness.Interestingly,when conducting tests to obtain WET,variations exist in the shape of coal or rock specimens.However,whether shape... The strain energy storage index(WET)is a crucial index for evaluating rockburst proneness.Interestingly,when conducting tests to obtain WET,variations exist in the shape of coal or rock specimens.However,whether shape factors affect WET has not been theoretically and experimentally verified.In this study,to investigate the independence of WET from specimen shape effects,its rationality was first theoretically derived based on the linear energy storage(LES)laws of rock,indicating that WET is influenced by the energy storage coefficient(ESC)of the rock.Two typical rock materials(granite and red sandstone)with different rockburst proneness were selected to verify the migration effect of cubic and cylindrical specimens on WET via uniaxial compression tests.The experimental results revealed that the mechanical behavior characteristics of rocks were affected by the shape of cylindrical and cubic specimens,whereas the WET and ESC were opposite.Furthermore,the practical WET values closely approximate the theoretical values of energy storage-dissipated ratio predicted by the LES law,converging to the peak-strength strain energy storage index(WPET).Based on the LES law,the influence of specimen shape on WET and WPET was further discussed,concluding that WET and WPET are independent of specimen shape effects.Furthermore,the WPET is more stable than WET and reflects the relative magnitude of energy storage and dissipation during the entire pre-peak of rock.Thus,the peak-strength strain energy storage index can be used as a substitute for WET in evaluating the rockburst proneness of rock. 展开更多
关键词 Rock mechanics Rockburst Strain energy storage index Linear energy storage(LES)law Energy storage coefficient Peak-strength strain energy storage index
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Compressive Stress-Strain Behavior of Seawater Sea-Sand Recycled Aggregate Concrete under Different Strain Rates and Replacement Ratio of Aggregates 认领 引用
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作者 ZHANG Kaijian ZHOU Kunjie +1 位作者 LIN Wenqiang ZHANG Qingtian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期658-673,共16页
The stress-strain curves of seawater sea-sand recycled aggregate concrete(SSRAC)with different replacement ratios of recycled coarse aggregate(RCA)or sea-sand under different strain rates were studied.The effects of d... The stress-strain curves of seawater sea-sand recycled aggregate concrete(SSRAC)with different replacement ratios of recycled coarse aggregate(RCA)or sea-sand under different strain rates were studied.The effects of different replacement ratios of RCA or sea-sand,and ages on the characteristic parameters of the stress-strain curve and corresponding dynamic increasing factor(DIF)of SSRAC were analyzed.Scanning electron microscopy(SEM)and nanoindentation tests were used to explain the variation of the characteristic parameters from the microscopic point of view.The results show that,when the replacement ratio of RCA or seasand is 50%,the strain rate sensitivity of elastic modulus is higher than that of peak stress;the DIF of peak stress exhibits a pattern of initially decreasing and then increasing with the increasing replacement ratio of RCA or sea-sand.Conversely,the DIF of elastic modulus initially shows an increase followed by a decrease.The introduction of seawater and sea-sand promotes hydration,resulting in a denser microstructure for SSRAC as compared to that of recycled aggregate concrete,which influences its strain rate sensitivity.Finally,a stressstrain prediction model of SSRAC is proposed,which can provide a theoretical basis for its experimental research and engineering application. 展开更多
关键词 seawater sea-sand recycled aggregate concrete(SSRAC) replacement ratio dynamic increase factor(DIF) strain rate sensitivity stress-strain curve model
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Strain-based modeling and analysis for rock blasting and geomechanics applications 认领 引用
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作者 Ruilin Yang 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期28-42,共15页
Predicting rock blasting outcomes in mining has been crucial since its inception.Blasting remains the most energy-and cost-efficient method for rock breaking and is often the only practical option.However,the mechanis... Predicting rock blasting outcomes in mining has been crucial since its inception.Blasting remains the most energy-and cost-efficient method for rock breaking and is often the only practical option.However,the mechanism is complex,influenced by various rock properties,explosives,and blast design parameters,making their effects difficult to quantify.Traditional stress-based models struggle with many parameters,such as stress and Poisson's ratio,which are challenging to measure in the field.Empirical models,though simpler,often oversimplify blast conditions.Both types of models are limited to simulating a few blastholes and cannot handle full-scale blasts involving hundreds of blastholes.However,modeling full-scale blasts with all blast design parameters is most required for modern mining applications.This paper presents a novel strain-based modeling approach for blasting and geomechanical applications,utilizing measurable variables such as particle velocity,strain,and displacement.By bypassing complex constitutive relations,strain-based models capture critical blasting trends and simulate full-scale blasts with full-blast design parameters with minimal calibration.The framework encompasses field strain measurements,model construction based on measurable variables,and laboratoryderived strain-failure criteria,each offering potential for future enhancement.Additionally,a standardized field test for site characterization is recommended.The approach is demonstrated through the Multiple Blasthole Fragmentation model,which simulates rock fragmentation and fragment strain during blasting,highlighting the practicality and effectiveness of strain-based modeling for multiple blasthole blasts.Moreover,this approach extends beyond blasting,with potential applications in highwall stability monitoring and other geomechanical applications.Strain-based modeling provides a simplified yet effective solution,avoiding the complexities of rock constitutive relations and field stress measurements while enabling full-blast design simulations for large-scale field blasts. 展开更多
关键词 field strain measurement lab-derived strain-failure criteria model full-scale blasts near-field blast vibration standardized field test strain-based modeling
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Mechanical response and deformation mechanism of Zr-Ti-Nb-Ta-Al refractory high-entropy alloy under the synergistic effects of temperature and strain rate 认领 引用 被引量：2
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作者 Zhanxuan Wang Yongkang Zhou +7 位作者 Heling Zheng Mingyang Wang Xintian Li Xiancheng Li Zhengkun Li Zhonghua Du Lizhi Xu Zhengwang Zhu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2026年第1期65-79,共15页
This study synthesized a high-strength Zr42Ti15Nb20Ta20Al3(at.%)refractory high-entropy alloy(RHEA)via vacuum induction melting.The mechanical behavior of the Zr42Ti15Nb_(2 n)Ta_(2 n)Al3RHEA wa... This study synthesized a high-strength Zr42Ti15Nb20Ta20Al3(at.%)refractory high-entropy alloy(RHEA)via vacuum induction melting.The mechanical behavior of the Zr42Ti15Nb_(2 n)Ta_(2 n)Al3RHEA was systematically investigated through a universal testing machine and split Hopkinson pressure bar system at strain rates up to 5100 s−1,and the temperature change is from 193 K to 673 K.By integrating theoretical derivation and microstructural characterization,we examined the mechanical behavior and deformation mechanisms of the Zr42Ti15Nb_(2 n)Ta_(2 n)Al3RHEA under the synergistic effects of temperature and strain rate.The results demonstrate that the Zr42Ti15Nb_(2 n)Ta_(2 n)Al3RHEA exhibits a significant positive strain rate effect.The dominant deformation mechanism changes with increasing strain rate:cross-slip→localized shear→adiabatic shear.When the strain rate reaches 5100 s−1,the yield strength increases from 1151 MPa to 2112 MPa,and an adiabatic shear band forms.Simultaneously,the microstructure undergoes severe localized deformation,dominated by shear bands,and dynamic recrystallization(DRX)is activated to counteract the deformation.At 193 K,the yield strength is 2241 MPa.Kink bands have appeared,enhancing the ductility of RHEA:the yield strength and the temperature sensitivity coefficient decrease with increasing temperature.However,as the temperature increases,atomic mobility is enhanced,which promotes grain boundary sliding and migration,activating DRX,and effectively mitigating shear localization.This study deepens our understanding of the mechanical properties and deformation mechanisms of the Zr42Ti15Nb20Ta20Al3RHEA.It reveals the microstructure evolution process of the alloy under different strain rates,the synergistic effect of strain rate and temperature,and the influence of strain rate and temperature on the deformation mechanisms of the material.This research lays a theoretical foundation for applying the Zr42Ti15Nb20Ta20Al3RHEA in extreme environments. 展开更多
关键词 Refractory high entropy alloy Temperature effect Strain rate Mechanical properties Deformation mechanism
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Soil desiccation cracking triggered by surface defects:Insight and mechanism based on strain/displacement analysis using DIC 认领 引用 被引量：2
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作者 Tao Wang Chao-Sheng Tang +3 位作者 Luan Lin Zhixiong Zeng Qing Cheng Zhengtao Shen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期651-661,共11页
Soil desiccation cracking is a prevalent natural phenomenon that poses significant geotechnical and geoenvironmental challenges.Cracks typically initiate at surface defects such as air bubbles,large aggregates,tiny pi... Soil desiccation cracking is a prevalent natural phenomenon that poses significant geotechnical and geoenvironmental challenges.Cracks typically initiate at surface defects such as air bubbles,large aggregates,tiny pits,or uneven surfaces,where localized stress concentrations are readily induced.This study conducted a series of laboratory desiccation tests on slurry samples to investigate the initiation and propagation of desiccation cracks in the presence of varying types and quantities of surface defects.Digital image correlation(DIC)technology was employed to monitor the strain and displacement fields on the soil surface during the desiccation process.The results reveal that strain and displacement data derived from DIC can precisely predict the initiation sites and propagation directions of desiccation cracks.In samples with internal defects,cracks predominantly propagate through the defect,whereas external defects tend to initiate cracks along their edges.In samples with multiple defects,Y-shaped crack patterns generally form initially,followed by T-shaped and straight cracks,driven by the evolving stress field.The dynamic interplay between crack formation and tensile stress redistribution governs the initiation and propagation of desiccation cracks. 展开更多
关键词 Desiccation cracking Digital image correlation(DIC)technology Defect Strain/displacement field Stress concentration
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Multi-scale modeling of ultra-thin commercially pure titanium sheet for fuel cell bipolar plates:Plastic anisotropy and distortional strain hardening 认领 引用 被引量：1
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作者 Kyung Mun Min Seonghwan Choi +2 位作者 Xiaohua Hu Jinwoo Lee Hyuk Jong Bong 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第5期1637-1651,共15页
This study presents a multi-scale modeling framework to describe the mechanical behavior of a 0.1 mm-thick commercially pure titanium(CP-Ti)sheet developed for fuel cell bipolar plates.Since standardized methods for c... This study presents a multi-scale modeling framework to describe the mechanical behavior of a 0.1 mm-thick commercially pure titanium(CP-Ti)sheet developed for fuel cell bipolar plates.Since standardized methods for characterizing ultra-thin sheets under complex stress states are lacking,a virtual modeling approach was employed.At the grain scale,a crystal plasticity finite element(CPFE)model was constructed to incorporate the relevant slip and twinning systems,enabling prediction of responses under diverse loading conditions.Extending to the continuum scale,the CPFE results,combined with tensile data,were used to calibrate an advanced constitutive model based on the evolutionary Yld2000-2d yield function,capable of capturing anisotropic behavior.Validation against independent limiting dome height tests confirmed the predictive accuracy of the framework.The proposed approach provides a basis for simulating the forming behavior of ultra-thin CP-Ti sheets and supports precise manufacturing of bipolar plates in fuel cell systems. 展开更多
关键词 commercially pure titanium sheet crystal plasticity plastic anisotropy distortional strain hardening multi-scale modeling
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Analysis-Oriented Stress–Strain Models for Ultra-High-Performance Concrete Confined with Fiber-Reinforced Polymer 认领 引用 被引量：1
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作者 Shishun Zhang Junjie Wang +1 位作者 Guan Lin Xuefei Nie 《Engineering》 SCIE EI CSCD 2026年第6期265-281,共17页
The use of fiber-reinforced polymer(FRP)jackets or tubes as confining devices can significantly improve the compressive performance of ultra-high-performance concrete(UHPC).For FRP-confined UHPC,an analysis-oriented s... The use of fiber-reinforced polymer(FRP)jackets or tubes as confining devices can significantly improve the compressive performance of ultra-high-performance concrete(UHPC).For FRP-confined UHPC,an analysis-oriented stress–strain model is essential for a comprehensive understanding of its compressive behavior and the development of design models.Although several analysis-oriented stress–strain models have been developed for FRP-confined normal-strength concrete(NSC),such models for FRP-confined UHPC are still lacking.In this study,an experiment is conducted to investigate the failure mechanism of UHPC confined with FRP under concentric compression,and the stress–strain behavior of the FRP-confined UHPC is analyzed using the stress–strain models of actively-confined UHPC.Results showed that the stress-path-independency assumption,which has been proven to apply to FRP-confined NSC,was inapplicable to FRP-confined UHPC.By modifying the confining pressure to consider the influence of stress-path dependency,an analysis-oriented model was proposed.The proposed model was verified using a collected test database.The results show that the proposed model accurately predicted the stress–strain behavior of FRP-confined UHPC. 展开更多
关键词 Ultra-high-performance concrete(UHPC) Fiber-reinforced polymer(FRP) Confinement mechanism Stress-path dependency Stress–strain model
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Structural design and strain transfer mechanism of fiberBragg grating–3D-printed geogrid 认领 引用
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作者 Wentao Zhong Mengxi Zhang +1 位作者 Yajun Wu Chengchun Qiu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4831-4842,共12页
This study integrates fiber Bragg grating(FBG)sensing technology with three-dimensional(3D)printing to develop a geogrid with strain-sensing capabilities.Polylactic acid(PLA)was used as the printing material,and the g... This study integrates fiber Bragg grating(FBG)sensing technology with three-dimensional(3D)printing to develop a geogrid with strain-sensing capabilities.Polylactic acid(PLA)was used as the printing material,and the geogrid was fabricated using fused deposition modeling(FDM).FBG sensors were embedded within the printed structure to achieve both reinforcement and real-time deformation monitoring.A theoretical model for strain transfer between the FBG sensors and the geogrid was proposed,considering both fiber grating and adhesive layer parameters.The model was validated through laboratory tensile tests on geogrids.The results indicate that the proposed strain transfer model aligns well with the experimental data,with a maximum relative error of less than 3%,demonstrating its effectiveness in monitoring geogrid deformation.A parametric analysis shows that increasing the grating sensing length enhances strain transfer performance by expanding the distribution range of interfacial shear strain.The shear modulus of the adhesive layer directly regulates interfacial slip resistance,while the Young's modulus influences strain response indirectly through structural stiffness.The effectiveness of both is constrained by the adhesive layer radius.Based on gray relational analysis(GRA),the mean gray relational grade(GRG)value of geometric parameters is 0.433,significantly higher than that of material parameters(0.381),confirming that optimizing structural design is a priority for improving sensing performance.The study provides theoretical support and technical guidance for the design and application of embedded optical fiber sensors in intelligent geotechnical engineering. 展开更多
关键词 Fiber Bragg grating(FBG) Geogrid Strain monitoring Strain transfer coefficient(STC)
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Physics-and position-aware GNNs for explosion-induced strain field reconstruction 认领 引用
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作者 Wei Xiao Hao Liu Lei Zhang 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2026年第2期149-156,共8页
High-fidelity strain measurements of plate and shell structures are crucial for elucidating failure mechanisms and deformation evolution.These data provide the basis for quantitative damage detection,design optimizati... High-fidelity strain measurements of plate and shell structures are crucial for elucidating failure mechanisms and deformation evolution.These data provide the basis for quantitative damage detection,design optimization,and structural health monitoring.However,laboratory constraints often preclude the acquisition of high-resolution full-field strains,limiting observations to a sparse set of discrete points.Reconstructing complete strain fields from these sparse measurements has therefore become a pressing challenge,for which few effective solutions exist.Motivated by the spatial correlations exhibited under blast loading,we develop a position-and physicsaware graph neural network(PPA-GNN)to recover transient strain fields in plate structures subjected to explosive impacts.The model employs graph-based message passing to encode both spatial topology and governing physical constraints among sensor nodes,markedly improving reconstruction fidelity.To cope with severe data sparsity in practice,we further devise a curriculum-learning schedule that gradually transitions training from dense to extremely sparse sampling,thereby enhancing robustness.The experimental results indicate that the PPA-GNN achieves an R2 value of 0.903 when only eight observation points are used,thereby demonstrating its capability for reliable full-field reconstruction under minimal sensing conditions. 展开更多
关键词 Full-field strains Reconstructed strain field Graph neural network Curriculum learning schedule
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Enhancing crack-based strain sensors for future wearables and robotics 认领 引用
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作者 Xing Chen Dongchan Li Desheng Kong 《Journal of Semiconductors》 EI CAS CSCD 2026年第8期5-9,共5页
Flexible sensors have become foundational components in the advancement of next-generation electronics,owing to their low elastic modulus,minimal bending stiffness,and inherent capacity to conform intimately to non-pl... Flexible sensors have become foundational components in the advancement of next-generation electronics,owing to their low elastic modulus,minimal bending stiffness,and inherent capacity to conform intimately to non-planar,dynamically deforming surfaces[1,2].These mechanical attributes fundamentally distinguish them from conventional rigid sensors,unlocking unique possibilities for seamless integration with soft biological tissues and curved robotic structures.Among the diverse sensing modalities,strain sensors are particularly essential.They transduce mechanical deformation into quantifiable electrical signals,enabling precise monitoring of motion,force,and subtle structural changes across multiple applications. 展开更多
关键词 sensing modalitiesstrain sensor crack based strain sensors wearables mechanical attributes flexible sensors soft biological tissues robotics conformability
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Highly Elastic Composite Aerogel based on Functionalized Cotton Fibers for Strain Sensing at Cryogenic Temperature 认领 引用
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作者 Meng Li Gui-Wen Huang +3 位作者 Na Li Yu Liu Si-Zhe Li Yong Huang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第3期706-718,I0011,共13页
With the development of electronic technologies,piezoresistive sensors have attracted increasing attention.Among them,aerogels with high elasticity,as a type of three-dimensional porous material,are widely used in the... With the development of electronic technologies,piezoresistive sensors have attracted increasing attention.Among them,aerogels with high elasticity,as a type of three-dimensional porous material,are widely used in the field of piezoresistive sensors.Nowadays,with the extension of science and technology areas,fields involving low-temperature environments have emerged,which has led to an increasing demand for piezoresistive sensors that can serve at cryogenic temperatures.However,most studies on aerogels have only focused on their sensing performance at room temperature,and there is a lack of research on aerogel sensors that can work at low temperatures.In this work,piezoresistive sensors based on cotton fibers were proposed for applications at 77 K.As one of the most important natural polymers,cotton fibers have the ability to maintain elasticity at very low temperatures.Cotton fiber-based aerogels with high elasticity and cyclic stability were obtained by controlling the freeze-casting parameters and size distribution of cotton fibers,and they showed excellent pressure sensing properties,including a wide sensing range and remarkable long-term stability.This study bridges the gap in cryogenic sensing materials and provides insights into microstructure-property relationships,advancing applications in aerospace and cryogenic engineering. 展开更多
关键词 Cotton fiber Aerogel Strain sensor Low temperature
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Highly Tough,Anti-freezing,Sensitive Polyvinyl Alcoholbased Organic Hydrogel for Wearable Flexible Strain Sensor 认领 引用
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作者 LIU Peng SHI Qiangfei +7 位作者 SUN Qilin LIU Feicong YANG Yuli SHANG Zhongdan DU Xiangrong CHEN Changxiu LI Yuanhang ZHANG Hanzhi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第4期1123-1133,共11页
A novel PVA/EG/GE/LiCl(PEGL)multifunctional hydrogel was developed by using a binary of ethylene glycol(EG)/water as solvent,with gelatin(GE)and PVA as the skeletons and lithium chloride(LiCl)for conductivity.The expe... A novel PVA/EG/GE/LiCl(PEGL)multifunctional hydrogel was developed by using a binary of ethylene glycol(EG)/water as solvent,with gelatin(GE)and PVA as the skeletons and lithium chloride(LiCl)for conductivity.The experimental results indicate that,compared to four other hydrogels,the PEGL hydrogel exhibits the best tensile strength(3.92±0.12 MPa),a good elongation at break(375.22±11.25%),and excellent anti-freezing properties,being able to withstand approximately 6500 times its own weight without breaking.Moreover,the PEGL organic hydrogel sensor has high sensitivity and rapid response characteristics,capable of transforming body movements into repeatable and stable electrical signals.This study provides new ideas for the development of new types of high-performance wearable flexible strain sensors. 展开更多
关键词 strain sensor hydrogel polyvinyl alcohol anti-freezing
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The tensile strain effect on multi-coverage structures of hydrogen adsorption at Pt(111)electrocatalyst surfaces:DFT calculation study 认领 引用
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作者 Qibo Deng Rui Huang +5 位作者 Longhui Wang Cuihua An Bo Yang Jun Xu Junsheng Li Ning Hu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期182-210,共29页
Understanding the adsorption behavior of hydrogen on catalyst surfaces is critical to a comprehensive analysis of the kinetics of the hydrogen evolution reaction(HER).While strain engineering to enhance single hydroge... Understanding the adsorption behavior of hydrogen on catalyst surfaces is critical to a comprehensive analysis of the kinetics of the hydrogen evolution reaction(HER).While strain engineering to enhance single hydrogen adsorption on catalysts is well-established,the mechanisms governing multiple hydrogen adsorption under strain remain unclear.In this study,we systematically investigate different adsorption structures of multi-coverage hydrogen on the Pt(111)catalyst’s surface by first-principles calculations.We propose two dimensions,“ke”and“kε”,to quantitatively describe the relationship between adsorption energy and d-band center with stress under different coverage levels.The results indicate that the above two values undergo dynamic changes under different coverage levels,proving that there are differences in the effect of stress under different H coverage conditions.Especially under high coverage,stress has a significant enhancement effect on H adsorption.Although the enhancement effect slightly decreases when hydrogen molecules are produced,there is still a significant overall enhancement,effectively suppressing the weakening of the original Pt-H adsorption caused by high coverage.We conducted theoretical verification from the perspectives of changes in adsorption energy and d-band center using these two dimensions,confirming that stress can effectively alter the d-band structure of Pt,optimize its interaction with adsorbed hydrogen,and provide a theoretical basis for further improving the HER performance of Pt catalysts under high current density by applying external stress. 展开更多
关键词 Multi-hydrogen adsorption Electrocapillary coupling Strain engineering First-principles calculation d-band center
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A rescued virus from the infectious clone of a PRRSV NADC34-like strain exhibits high pathogenicity for nursery pigs 认领 引用
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作者 Zhenbang Zhu Zhengqin Ye +5 位作者 Wenqiang Wang Yanhua Li Zhe Sun Xiuling Yu Kegong Tian Xiangdong Li 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第5期2041-2050,共10页
NADC34-like porcine reproductive and respiratory syndrome virus(PRRSV) has been circulating in China for several years and became the dominant field strain in some provinces.Current commercial vaccines could not provi... NADC34-like porcine reproductive and respiratory syndrome virus(PRRSV) has been circulating in China for several years and became the dominant field strain in some provinces.Current commercial vaccines could not provide complete crossprotection to NADC34-like PRRSV infection,which led to huge economic losses on pig farms.Co-infections of NADC34-like PRRSV with some other PRRSV strains are commonly found in many clinical cases,and successful isolation of NADC34-like PRRSV strain from the clinical samples has been a challenge to study its biological characters and perform animal experiments to evaluate its pathogenicity.In this study,we constructed a NADC34-like PRRSV infectious clone derived from the isolated JS2021 NADC34 PRRSV strain using the reverse genetics technique and investigated its virulence and pathogenicity for nursery pigs.The rescued(rNADC34) strain could proliferate well in porcine alveolar macrophages(PAMs),and the viral copy number and titers were comparable to parental strain.For pathogenicity,the rNADC34 straininfected pigs showed high body temperature and body weight loss.The histopathological results presented interstitial pneumonia and severe hemorrhage,infiltration of neutrophils and lymphocyte in lungs,lymph nodes,and tonsils.The viral proteins were also detectable in rNADC34 strain-infected pigs using immunohistochemistry staining.Moreover,the trends of PRRSV-specific antibody and viremia in PRRSV rNADC34-infected pigs were similar with the parental strain-infected pigs.These data indicated that rNADC34 strain manifested strong virulence and high pathogenicity for nursery pigs. 展开更多
关键词 PRRSV NADC34-like strain infectious clone pathogenicity
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Flow characteristics and deformation mechanism of Al-Mg-Si alloy under coupled conditions of cryogenic temperature and high strain rate 认领 引用
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作者 Fei DONG Xiao-qiang PENG +3 位作者 Tao LAI Chao-liang GUAN Hao HU Yi-fan DAI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1428-1443,共16页
The flow characteristics and deformation mechanism of Al-Mg-Si alloy were studied at various temperatures(77-298 K)and strain rates(900−7000 s-1)using the Hopkinson pressure bar method,electron backscattered diffra... The flow characteristics and deformation mechanism of Al-Mg-Si alloy were studied at various temperatures(77-298 K)and strain rates(900−7000 s-1)using the Hopkinson pressure bar method,electron backscattered diffraction(EBSD),and transmission electron microscopy(TEM).The results showed that increasing the strain rate and decreasing the deformation temperature significantly enhanced the work hardening ability of Al-Mg-Si alloy,thereby markedly improving the plasticity.A dislocation density-based constitutive model for the Al-Mg-Si alloy was established,incorporating dislocation accumulation and dynamic recovery mechanisms,which accurately described the flow behaviors under different conditions.Microstructural observation revealed that the combination of cryogenic temperature and high strain rate significantly suppressed dislocation cross-slip,which led to the formation of numerous slip bands.As strain accumulated,these slip bands interacted and facilitated recrystallization,thereby obviously accelerating the grain refinement process. 展开更多
关键词 flow characteristics deformation mechanism Al-Mg-Si alloy cryogenic temperature high strain rate grain refinement
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