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Strain localization-controlled rock failure using digital volume correlation technology: In situ compression tests on 3D-printed rocklike samples with a single initial flaw 认领 引用 被引量：2
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作者 Yulong Shao Jingwei Yang +4 位作者 Jineon Kim Chen He Jae-Joon Song Hong Yin Junsu Leem 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第7期4329-4348,共20页
The study of rock failure mechanisms is fundamental to geotechnical engineering,as it enhances design quality and mitigates disaster risks.This research employed in situ compression tests on 3D-printed rocklike sample... The study of rock failure mechanisms is fundamental to geotechnical engineering,as it enhances design quality and mitigates disaster risks.This research employed in situ compression tests on 3D-printed rocklike samples with a single flaw,combining Micro-CT scans and a specialized loading device to analyze their behavior.Mechanical properties and failure modes of these printed samples were compared to those of natural flawed sandstones,demonstrating the capability of 3D printing to replicate natural rock characteristics.By reconstructing 3D crack evolution from 2D CT images and applying digital volume correlation(DVC),the study visualized internal strain fields and established a relationship between strain patterns and rock failure.The results reveal that crack initiation consistently occurs at the flaw,advancing into tensile and secondary shear or mixed cracks.For flaw angles(α)ranging from 0°to 45°,the 3D-printed samples exhibited a higher number of newly formed cracks and a faster increase in crack volume with strain.In contrast,for flaw angles of 45°≤α≤90°,the opposite trend was observed.The internal strain field exhibited significant strain localization,with this uneven distribution playing a critical role in sample failure.When the flaw angle was in the range of 0°≤α≤30°,failure was primarily driven by tensile cracks,forming distinct tensile bands.Conversely,for 30°<α≤90°,a combination of tensile and shear cracks dominated the failure,producing both shear and tensile bands in the sample.Additionally,the strain field component εyy showed a strong correlation with the evolution of internal damage,providing valuable insights into the underlying rock failure mechanisms. 展开更多
关键词 3D printing In situ compression test CT scanning Digital volume correlation(DVC) Damage evolution Strain localization Failure mechanism
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Numerically and Experimentally Establishing Rheology Law for AISI 1045 Steel Based on Uniaxial Hot Compression Tests 认领 引用
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作者 Josef Walek Petr Lichy 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第3期3135-3153,共19页
Plastometric experiments,supplemented with numerical simulations using the finite element method(FEM),can be advantageously used to characterize the deformation behavior of metallic materials.The accuracy of such simu... Plastometric experiments,supplemented with numerical simulations using the finite element method(FEM),can be advantageously used to characterize the deformation behavior of metallic materials.The accuracy of such simulations predicting deformation behaviors of materials is,however,primarily affected by the applied rheology law.The presented study focuses on the characterization of the deformation behavior of AISI 1045 type carbon steel,widely used e.g.,in automotive and power engineering,under extreme conditions(i.e.,high temperatures,strain rates).The study consists of two main parts:experimentally analyzing the flow stress development of the steel under different thermomechanical conditions via uniaxial hot compression tests and establishing the rheology law via numerical simulations implementing the experimentally acquired flow stress curves.The numerical simulations then not only serve to establish the rheology law but also to verify the reliability of the selected experimental process.The results of the numerical simulations showed that the established rheology law characterizes the behavior of the investigated steel with sufficient accuracy also at high temperatures and/or strain rates,and can,therefore,be used for practical purposes.Last but not least,supplementary microstructure analyses performed for the samples subjected to the highest deformation temperature provided a deeper insight into the effects of the applied(extreme)thermomechanical conditions on the behavior of the investigated steel. 展开更多
关键词 Rheology law numerical simulation finite element method hot compression test deformation behavior microstructure
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Finite element analysis of small-scale hot compression testing 认领 引用
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作者 Patryk Jedrasiak Hugh Shercliff 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第17期174-188,共15页
This paper models hot compression testing using a dilatometer in loading mode.These small-scale tests provide a high throughput at low cost,but are susceptible to inhomogeneity due to friction and temperature gradient... This paper models hot compression testing using a dilatometer in loading mode.These small-scale tests provide a high throughput at low cost,but are susceptible to inhomogeneity due to friction and temperature gradients.A novel method is presented for correcting the true stress-strain constitutive response over the full range of temperatures,strain-rates and strain.The nominal response from the tests is used to predict the offset in the stress-strain curves due to inhomogeneity,and this stress offsetΔσis applied piecewise to the data,correcting the constitutive response in one iteration.A key new feature is the smoothing and fitting of the flow stress data as a function of temperature and strain-rate,at multiple discrete strains.The corrected model then provides quantitative prediction of the spatial and temporal variation in strain-rate and strain throughout the sample,needed to correlate the local deformation conditions with the microstructure and texture evolution.The study uses a detailed series of 144 hot compression tests of a Zr-Nb alloy.While this is an important wrought nuclear alloy in its own right,it also serves here as a test case for modelling the dilatometer for hot testing of high temperature alloys,particularly those with dualα-βphase microstructures(such as titanium alloys). 展开更多
关键词 Finite element analysis Process modelling Hot compression testing Upsetting Zr alloys Ti alloys
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Constitutive relationship of IN690 superalloy by using uniaxial compression tests 认领 引用 被引量：15
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作者 SUN Chaoyang LIU Jinrong +2 位作者 LI Rui ZHANG Qingdong DONG Jianxin 《Rare Metals》 SCIE EI CAS CSCD 2011年第1期81-86,共6页
The hot deformation behavior of IN690 superalloy was characterized in a temperature range of 1273-1473 K and a strain rate range of 0.01-10 s^-1 using uniaxial compression tests on process annealed material.The consti... The hot deformation behavior of IN690 superalloy was characterized in a temperature range of 1273-1473 K and a strain rate range of 0.01-10 s^-1 using uniaxial compression tests on process annealed material.The constitutive relations between flow stress and effective strain,effective strain rate as well as deformation temperature were studied.It can be concluded that the flow stress significantly reduces with the deformation temperature of IN690 superalloy increasing.Whereas,there is a significant increase of flow stress when the strain rate increases from 0.1 s^-1 to 10 s^-1.Based on the hyperbolic-sine Arrhenius-type equation,a constitutive equation considering compensation of strain was developed.The activation energy and the material constants（Q,n and ln A） decrease as the deformation strain increases.The strain dependent term is successfully incorporated in the constitutive equation through a quartic equation.A good agreement between the experimental data and the predicted results has been achieved,indicating that the proposed constitutive equation and the methods of determing the material constants are suitable to model the high temperature deformation behavior of IN690 superalloy. 展开更多
关键词 superalloys compression testing constitutive equations activation energy
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Stress-strain behavior of plastic concrete using monotonic triaxial compression tests 认领 引用 被引量：15
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作者 Y.Pashang Pisheh S.M.Mir Mohammad Hosseini 《Journal of Central South University》 SCIE EI CAS 2012年第4期1125-1131,共7页
The mechanical behavior of plastic concrete used in the cut-off walls of earth dams has been studied. Triaxial compression tests on the specimens in various ages and mix designs under different confining pressures hav... The mechanical behavior of plastic concrete used in the cut-off walls of earth dams has been studied. Triaxial compression tests on the specimens in various ages and mix designs under different confining pressures have been done and the stress-strain behavior of such materials and their strength parameter changes have been experimentally investigated. It has been observed that increasing the confining pressures applied on the specimens causes the material behavior to be alike the more ductile materials and the compressive strength increases considerably as well. Moreover, a parametric study has been carded out to investigate the influence of essential parameters on the shear strength parameters of these materials. According to the research, increasing the coarse to fine aggregates ratio leads to the increase of compressive strength of the specimens as well as the increase of the cohesion and internal friction angle of the materials. Furthermore, the bentonite content decrease and the cement factor increase result in an increase of the cohesion parameter of plastic concretes and decrease of the internal friction angle of such materials. 展开更多
关键词 plastic concrete stress-strain behavior triaxial compression test strength elastic modulus
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Mechanical Performance and Deformation Mechanisms of Additively Manufactured Lattice Structures under Quasi-Static Compression and Finite Element Analysis 认领 引用
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作者 Izzat bin Mat Samudin Muhammad Adam Johan bin Muhammad Affindy +1 位作者 Quanjin Ma Nabilah Afiqah binti Mohd Radzuan 《Journal of Polymer Materials》 SCIE CAS 2026年第2期436-455,共20页
Lattice structures fabricated through additive manufacturing(AM)offer exceptional strength-to-weight ratios,as their geometries allow them to carry high loads with far less material than solid components.When paired w... Lattice structures fabricated through additive manufacturing(AM)offer exceptional strength-to-weight ratios,as their geometries allow them to carry high loads with far less material than solid components.When paired with polylactic acid(PLA),they combine biodegradability with ease of processing,allowing the structures to be produced efficiently while also offering an environmentally friendly material option.However,comparative studies across different lattice types under uniform conditions remain limited,as many existing studies only focus on a single geometry type.Therefore,this study investigates the compressive performance of PLA lattice structures,which include body-centered cubic(BCC),honeycomb and gyroid,fabricated using fused deposition modelling(FDM).To ensure consistent mechanical performance and mitigate variability from commercial filaments,the PLA filaments used were produced in-house from raw pellets.This approach enhances material homogeneity and repeatability,which is critical for reliable comparative analysis.Quasi-static compression tests and finite element analysis(FEA)were conducted to evaluate the mechanical properties and deformation mechanisms.Results revealed that the gyroid structure outperformed the other structures,showing a 44%higher elastic modulus(199.56 MPa)and 60%higher compressive strength(6.64 MPa).The continuous topology of the gyroid structure enabled a uniform stress distribution throughout the lattice and enhanced energy absorption by promoting progressive deformation under load.Simulation results aligned with experimental trends,though slight overestimations occurred due to idealized modelling such as perfect geometry and material homogeneity.This work provides validated numerical models and practical insights for designing sustainable lightweight components in engineering applications. 展开更多
关键词 Polymer lattices fused deposition modelling compression test finite element analysis mechanical properties
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Variation of the friction conditions in cold ring compression tests of medium carbon steel 认领 引用 被引量：7
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作者 Dawei ZHANG Bingkun LIU +2 位作者 Jingxiang LI Minchao CUI Shengdun ZHAO 《Friction》 SCIE EI CAS CSCD 2020年第2期311-322,共12页
Lubrication and friction conditions vary with deformation during metal forming processes.Significant macro-variations can be observed when a threshold of deformation is reached.This study shows that during the cold co... Lubrication and friction conditions vary with deformation during metal forming processes.Significant macro-variations can be observed when a threshold of deformation is reached.This study shows that during the cold compression processing of#45(AISI 1045)steel rings,the magnitude of friction and surface roughness(Ra)changes significantly upon reaching a 45%reduction in ring height.For example,the Ra of compressed ring specimens increased by approximately 55%immediately before and after reaching this threshold,compared to an 18% or 25%variation over a 35%-45%or a 45%-55%reduction in height,respectively.The ring compression test conducted by this study indicates that the Coulomb friction coefficient and Tresca friction factor mare 0.105 and 0.22,respectively,when the reduction in height is less than 45%;and 0.11 and 0.24,respectively,when the reduction in height is greater than 45%. 展开更多
关键词 friction condition ring compression test friction calibration curve surface topography
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Evaluation of granule structure and strength properties of green packed beds in iron ore sintering using high-resolution X-ray tomography and uniaxial compression testing 认领 引用 被引量：2
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作者 Mingxi Zhou Hao Zhou 《Particuology》 SCIE EI CAS CSCD 2021年第4期157-166,共10页
The strength properties of green sinter beds,including the Young’s modulus and maximum bed strain,were evaluated using uniaxial compression tests.The green-sinter-bed samples were scanned using X-ray computed tomogra... The strength properties of green sinter beds,including the Young’s modulus and maximum bed strain,were evaluated using uniaxial compression tests.The green-sinter-bed samples were scanned using X-ray computed tomography(XCT),and the geometry characteristics of the granules were quantified by XCT image analysis.The orthogonal array method was applied to determine the concomitant effects of the moisture,hydrated lime,and concentrate contents on the bed strength characteristics.Less bed strain was observed when the granules had a thin adhering layer and increased interlock contacts,which had a great capacity to resist the applied load collectively.The optimal combination for decreasing the bed maximum strain was 5.8%moisture,2%hydrated lime,and 0%concentrate.The moisture and concentrate contents were the most significant factors determining the green bed strength.Increasing the moisture and concentrate contents produced granules with a thicker and more deformable adhering layer,resulting in a more compact bed.The addition of hydrated lime inhibited rearrangement,deformation,and fracture of the granules in green sinter bed during compression. 展开更多
关键词 Packed bed strength Iron ore sintering X-ray computed tomography Uniaxial compression test Granule properties
Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression 认领 引用 被引量：6
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作者 Qian Yin Fan Wen +7 位作者 Zhigang Tao Hai Pu Tianci Deng Yaoyao Meng Qingbin Meng Hongwen Jing Bo Meng Jiangyu Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第2期311-324,共14页
The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious materials.Consequently,the true triaxial compressio... The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious materials.Consequently,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(PCNT)that satisfied fractal theory for the PSD of aggregates.The mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically analyzed.The results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at PCNTof 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σp),axial peak strain(ε1,p),elastic strain energy(Ue),and dissipated energy(Ud)increased by 12.76%,29.60%,19.05%,and90.39%,respectively.However,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρp,ε1,p,and the volumetric strain increment(Δεv)when PCNTincreases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the aggregates.Theσpand Udfirstly increase and then decrease with increasing D,and porosity shows the opposite trend.Theε1,pandΔεvare negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε1,p=0.05079,Δεv=0.01990)due to the frictional slip effect caused by coarse aggregates.With increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure. 展开更多
关键词 cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes
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Progressive failure of frozen sodium sulfate saline sandy soil under uniaxial compression 认领 引用 被引量：1
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作者 Dongyong Wang Bo Shao +2 位作者 Jilin Qi Wenyu Cui Liyun Peng 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第7期4646-4656,共11页
The progressive failure characteristics of geomaterial are a remarkable and challenging topic in geotechnical engineering.To study the effect of salt content and temperature on the progressive failure characteristics ... The progressive failure characteristics of geomaterial are a remarkable and challenging topic in geotechnical engineering.To study the effect of salt content and temperature on the progressive failure characteristics of frozen sodium sulfate saline sandy soil,a series of uniaxial compression tests were performed by integrating digital image correlation(DIC)technology into the testing apparatus.The evolution law of the uniaxial compression strength(UCS),the failure strain,and the formation of the shear band of the frozen sodium sulfate saline sandy soil were analyzed.The test results show that within the scope of this study,with the increase of salt content,both the UCS and the shear band angle initially decrease with increasing salt content before showing an increase.In contrast,the failure strain and the width of the shear band exhibit an initial increase followed by a decrease in the samples.In addition,to investigate the brittle failure characteristics of frozen sodium sulfate saline sandy soil,two classic brittleness evaluation methods were employed to quantitatively assess the brittleness level for the soil samples.The findings suggest that the failure characteristics under all test conditions in this study belong to the transition stage between brittle and ductile,indicating that frozen sodium sulfate saline sandy soil exhibits certain brittle behavior under uniaxial compression conditions,and the brittleness index basically decreases and then increases with the rise in salt content. 展开更多
关键词 Frozen sodium sulfate saline sandy soil Uniaxial compression test Digital image correlation Progressive failure Brittleness index
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Mechanical response and failure mechanism of inclined rough jointed rock under true triaxial compression loading 认领 引用
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作者 LIU Han-xiang JING Hong-wen +3 位作者 YUAN Yong YIN Qian WEN Fan LI Bo 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第10期4012-4034,共23页
Rock-like specimens containing a joint with different inclination angles and roughness were prepared using 3D printing technology.Then,true triaxial compression loading experiments were conducted on those jointed spec... Rock-like specimens containing a joint with different inclination angles and roughness were prepared using 3D printing technology.Then,true triaxial compression loading experiments were conducted on those jointed specimens.The increase in roughness leads to an increase in the axial strength and peak strain.With the increasing inclination angle,the axial strength initially decreases from 30°to 60°and then increases from 60°to 90°.While the peak strain first rises from 30°to 45°and then declines from 45°to 90°.The variation in failure mode results from differences in lateral stress on the joints under different strike directions.Specimens with joint strike parallel to the intermediate principal stress predominantly showed matrix or matrix-joint mixed shear failure,whereas those parallel to the minimum principal stress exhibited matrix shear failure.The analysis results of acoustic emission signals indicate the crack number and shear crack percentage increase with the increasing roughness and first decrease(30°to 60°),then increase(60°to 90°)with the increasing inclination angle.The research results can provide some guidance for the design and support of underground engineering with jointed surrounding rock. 展开更多
关键词 jointed rock true triaxial compression test mechanical response failure mechanism
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Modeling compression behaviors of freeze-thaw-impacted soils extending the disturbed state concept 认领 引用
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作者 Pan Zhang Sai K.Vanapalli Zhong Han 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第10期6606-6620,共15页
This study investigates the volumetric behaviors of various soils during freeze-thaw(FT)cycles and subsequent one-dimensional(1D)compression from experimental and theoretical studies.Experimental studies were performe... This study investigates the volumetric behaviors of various soils during freeze-thaw(FT)cycles and subsequent one-dimensional(1D)compression from experimental and theoretical studies.Experimental studies were performed on saturated expansive soil specimens with varying compaction conditions and soil structures under different stress states.Experimental results demonstrate that the specimens expand during freezing and contract during thawing.All specimens converge to the same residual void ratio after seven FT cycles,irrespective of their different initial void ratio,stress state,and soil structure.The compression index of the expansive soil specimens increases with the initial void ratio,whereas their swelling index remains nearly constant.A model extending the disturbed state concept(DSC)is proposed to predict the 1D compression behaviors of FT-impacted soils.The model incorporates a parameter,b,to account for the impacts of FT cycles.Empirical equations have been developed to link the key model parameters(i.e.the normalized yield stress and parameter b)to the soil state parameter(i.e.the normalized void ratio)in order to simplify the prediction approach.The proposed model well predicts the results of the tested expansive soil.In addition,the model’s feasibility for other types of soils,including low-and high-plastic clays,and high-plastic organic soils,has been validated using published data from the literature.The proposed model is simple yet reliable for predicting the compression behaviors of soils subjected to FT cycles. 展开更多
关键词 Initial state Freeze-thaw(FT)cycle test One-dimensional(1D)compression test Disturbed state concept(DSC) Compression model
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Temperature-controlled triaxial compression/creep test device for thermodynamic properties of soft sedimentary rock and corresponding theoretical prediction 认领 引用 被引量：3
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作者 Sheng Zhang Hirotomo Nakano +2 位作者 Yonglin Xiong Tomohiro Nishimura Feng Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 EI 2010年第3期255-261,共7页
In deep geological disposal of high-level nuclear waste,one of the most important subjects is to estimate long-term stability and strength of host rock under high temperature conditions caused by radioactive decay of ... In deep geological disposal of high-level nuclear waste,one of the most important subjects is to estimate long-term stability and strength of host rock under high temperature conditions caused by radioactive decay of the waste.In this paper,some experimental researches on the thermo-mechanical characteristics of soft sedimentary rock have been presented.For this reason,a new temperature-controlled triaxial compression and creep test device,operated automatically by a computer-controlled system,whose control software has been developed by the authors,was developed to conduct the thermo-mechanical tests in different thermal loading paths,including an isothermal path.The new device is proved to be able to conduct typical thermo-mechanical element tests for soft rock.The test device and the related testing method were introduced in detail.Finally,some test results have been simulated with a thermo-elasto-viscoplastic model that was also developed by the authors. 展开更多
关键词 temperature control soft sedimentary rock thermal triaxial compression test thermal triaxial creep test
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ADVANCED FREQUENCY-DIRECTED RUN-LENTH BASED CODING SCHEME ON TEST DATA COMPRESSION FOR SYSTEM-ON-CHIP 认领 引用 被引量：1
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作者 张颖 吴宁 葛芬 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2012年第1期77-83,共7页
Test data compression and test resource partitioning （TRP） are essential to reduce the amount of test data in system-on-chip testing. A novel variable-to-variable-length compression codes is designed as advanced fre... Test data compression and test resource partitioning （TRP） are essential to reduce the amount of test data in system-on-chip testing. A novel variable-to-variable-length compression codes is designed as advanced fre- quency-directed run-length （AFDR） codes. Different [rom frequency-directed run-length （FDR） codes, AFDR encodes both 0- and 1-runs and uses the same codes to the equal length runs. It also modifies the codes for 00 and 11 to improve the compression performance. Experimental results for ISCAS 89 benchmark circuits show that AFDR codes achieve higher compression ratio than FDR and other compression codes. 展开更多
关键词 test data compression FDR codes test resource partitioning system-on-chip
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An Efficient Test Data Compression Technique Based on Codes 认领 引用
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作者 方建平 郝跃 +1 位作者 刘红侠 李康 《Journal of Semiconductors》 CAS 北大核心 2005年第11期2062-2068,共7页
This paper presents a new test data compression/decompression method for SoC testing,called hybrid run length codes. The method makes a full analysis of the factors which influence test parameters：compression ratio,t... This paper presents a new test data compression/decompression method for SoC testing,called hybrid run length codes. The method makes a full analysis of the factors which influence test parameters：compression ratio,test application time, and area overhead. To improve the compression ratio, the new method is based on variable-to-variable run length codes,and a novel algorithm is proposed to reorder the test vectors and fill the unspecified bits in the pre-processing step. With a novel on-chip decoder, low test application time and low area overhead are obtained by hybrid run length codes. Finally, an experimental comparison on ISCAS 89 benchmark circuits validates the proposed method 展开更多
关键词 test data compression unspecified bits assignment system-on-a-chip test hybrid run-length codes
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Reverse size effect on unconfined compressive strength of red-bed rocks using micro-CT technique 认领 引用 被引量：1
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作者 Qinyuan Liang Hengxing Lan +3 位作者 Yu Zhou Bo Li Shijie Liu Han Bao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3425-3446,共22页
This study integrates unconfined compression tests with high-resolution computed tomography(CT)to analyze the pore heterogeneity,crack propagation,and failure modes of red sandstone specimens with diameters ranging fr... This study integrates unconfined compression tests with high-resolution computed tomography(CT)to analyze the pore heterogeneity,crack propagation,and failure modes of red sandstone specimens with diameters ranging from 10 mm to 100 mm.Key findings include:(1)With increasing specimen size,crack initiation stress(CI),damage stress(CD),and unconfined compressive strength(UCS)initially increase and then decrease;(2)In smaller specimens,stress concentration due to pore heterogeneity leads to splitting failure and lower strength;(3)In medium-sized specimens,friction dominates crack propagation,causing shear failure,while increased fragment rotation enhances energy dissipation,yielding highest strength;(4)In larger specimens,cracks tend to propagate along bedding planes,reducing energy dissipation and then weakening strength.These results provide insights into the reverse size effect on sandstone strength and have implications for engineering applications. 展开更多
关键词 Red sandstone Reverse size effect Unconfined compression test Pore heterogeneity Crack propagation Computed tomography(CT)
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Mechanical properties, deformation response, energy evolution and failure pattern of stratified cemented tailings backfill under triaxial compression 认领 引用 被引量：2
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作者 Wenbin Xu Yalun Zhang +1 位作者 Kangqi Zhao Tong Sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第10期2391-2405,共15页
The backfill should keep stable in the primary stope when mining an adjacent secondary stope in subsequent open stoping mining methods,and the large-size mined-out area is usually backfilled by multiple backfilling be... The backfill should keep stable in the primary stope when mining an adjacent secondary stope in subsequent open stoping mining methods,and the large-size mined-out area is usually backfilled by multiple backfilling before the recovery of a secondary stope,resulting in a layered structure of backfill in stope.Therefore,it is significant to investigate the deformation responses and mechanical properties of stratified cemented tailings backfill(SCTB)with different layer structures to remain self-standing as an artificial pillar in the primary stope.The current work examined the effects of enhance layer position(1/3,1/2,and 2/3)and thickness ratio(0,0.1,0.2,and 0.3)on the mechanical properties,deformation,energy evolution,microstructures,and failure modes of SCTB.The results demonstrate that the incorporation of an enhance layer significantly strengthens the deformation and strength of SCTB.Under a confining pressure of 50 kPa,the peak deviatoric stress rises from 525.6 to 560.3,597.1,and 790.5 kPa as the thickness ratio of enhance layer is increased from 0 to 0.1,0.2,and 0.3,representing a significant increase of 6.6%,13.6%,and 50.4%.As the confining pressure increases,the slopes of the curves in the elastic stage become steep,and the plastic phase is extended accordingly.Additionally,the incorporation of the enhance layer significantly improves the energy storage linit of SCTB specimen.As the thickness ratio of the enhance layer increases from 0 to 0.1,0.2,and 0.3,the elastic energy rises from 0.54 to 0.67,0.84,and 1.00 MJ·m-3,representing a significant increase of 24.1%,55.6%,and 85.2%.The internal friction angles and cohesions of the SCTB specimens are higher than those of the CTB specimens,however,the cohesion is more susceptible to enhance layer position and thickness ratio than the internal friction angle.The failure style of the SCTB specimen changes from shear failure to splitting bulging failure and shear bulging failure with the presence of an enhance layer.The crack propagation path is significantly blocked by the enhance layer.The findings are of great significance to the application and stability of the SCTB in subsequent stoping backfilling mines. 展开更多
关键词 stratified cemented tailings backfill enhance layer triaxial compressive tests mechanical properties energy evolution
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System-on-Chip Test Data Compression Based on Split-Data Variable Length (SDV) Code 认领 引用
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作者 J. Robert Theivadas V. Ranganathan J. Raja Paul Perinbam 《Circuits and Systems》 2016年第8期1213-1223,共11页
System-on-a-chips with intellectual property cores need a large volume of data for testing. The large volume of test data requires a large testing time and test data memory. Therefore new techniques are needed to opti... System-on-a-chips with intellectual property cores need a large volume of data for testing. The large volume of test data requires a large testing time and test data memory. Therefore new techniques are needed to optimize the test data volume, decrease the testing time, and conquer the ATE memory limitation for SOC designs. This paper presents a new compression method of testing for intellectual property core-based system-on-chip. The proposed method is based on new split- data variable length (SDV) codes that are designed using the split-options along with identification bits in a string of test data. This paper analyses the reduction of test data volume, testing time, run time, size of memory required in ATE and improvement of compression ratio. Experimental results for ISCAS 85 and ISCAS 89 Benchmark circuits show that SDV codes outperform other compression methods with the best compression ratio for test data compression. The decompression architecture for SDV codes is also presented for decoding the implementations of compressed bits. The proposed scheme shows that SDV codes are accessible to any of the variations in the input test data stream. 展开更多
关键词 Test Data Compression SDV Codes SOC ATE Benchmark Circuits
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Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression 认领 引用 被引量：15
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作者 Kun Du Xuefeng Li +4 位作者 Rui Su Ming Tao Shizhan Lv Jia Luo Jian Zhou 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2022年第2期347-362,共16页
Isolated pillars in underground mines are subjected to uniaxial stress,and the load bearing cross-section of pillars is commonly rectangularly shaped.In addition,the uniaxial compression test(UCT)is widely used for de... Isolated pillars in underground mines are subjected to uniaxial stress,and the load bearing cross-section of pillars is commonly rectangularly shaped.In addition,the uniaxial compression test(UCT)is widely used for determining the basic mechanical properties of rocks and revealing the mechanism of isolated pillar disasters under unidimensional stress.The shape effects of rock mechanical properties under uniaxial compression are mainly quantitatively reflected in the specific shape ratios of rocks.Therefore,it is necessary to study the detailed shape ratio effects on the mechanical properties of rectangular prism rock specimens and isolated pillars under uniaxial compressive stress.In this study,granite,marble and sandstone rectangular prism specimens with various height to width ratios(r)and width to thickness ratios(u)were prepared and tested.The study results show that r and u have a great influence on the bearing ability of rocks,and thin or high rocks have lower uniaxial compressive strength.Reducing the level of r can enhance the u effect on the strength of rocks,and increasing the level of u can enhance the r effect on the strength of rocks.The lateral strain on the thickness side of the rock specimen is larger than that on the width side,which implies that crack growth occurs easily on the thickness side.Considering r and u,a novel strength prediction model of isolated pillars was proposed based on the testing results,and the prediction model was used for the safety assessment of 179 isolated pillars in the Xianglu Mountain Tungsten Mine. 展开更多
关键词 Uniaxial compression test Isolated pillar Rectangular prism Shape ratio effect Failure property
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Triaxial creep tests of weak sandstone from fracture zone of high dam foundation 认领 引用 被引量：22
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作者 张玉 徐卫亚 +1 位作者 顾锦健 王伟 《Journal of Central South University》 SCIE EI CAS 2013年第9期2528-2536,共9页
The lithology of fracture zone which was developed at the dam foundation of a hydropower station is weak sandstone with poor integrity and pore cementation contact.Its creep properties have a significant impact on the... The lithology of fracture zone which was developed at the dam foundation of a hydropower station is weak sandstone with poor integrity and pore cementation contact.Its creep properties have a significant impact on the deformation and stability of the dam.Based on the characteristics of loose organizational structure,high moisture content and poor mechanical properties,the triaxial compression tests and creep tests were carried out,respectively.The results show significant non-linear,low strength and no obvious strength peaks.Both axial and lateral strains are achieved more than 3%when the tests are failed.The weak sandstone has a significant creep property,but only transient and steady state appear under low stress.Increased stress causes creep intensified and lateral strain gradually exceeds axial strain.In the failure stage,it has characteristics of large axial plastic deformation,obvious volumetric ductility dilation and large steady creep rate.The accelerated creep appears shortly after transient loading under confining of pressures 1.0 MPa and 1.5 MPa.Therefore,an improved Burgers creep model considering the non-linear characteristics of weak sandstone is built based on hyperbolic equation and the creep parameters are identified.This model can well describe the creep properties of weak sandstone. 展开更多
关键词 hydropower station weak sandstone creep properties triaxial compression tests triaxial creep tests improved Burgers creep model
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