期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到128篇文章
< 1 2 … 7 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Finite element analysis of small-scale hot compression testing 认领 引用
1
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
暂未订购 下载PDF
Mechanical Performance and Deformation Mechanisms of Additively Manufactured Lattice Structures under Quasi-Static Compression and Finite Element Analysis 认领 引用
2
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
暂未订购 下载PDF
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
3
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
4
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
暂未订购 下载PDF
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
5
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
暂未订购 下载PDF
Progressive failure of frozen sodium sulfate saline sandy soil under uniaxial compression 认领 引用 被引量：1
6
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
暂未订购 下载PDF
Mechanical response and failure mechanism of inclined rough jointed rock under true triaxial compression loading 认领 引用
7
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
暂未订购 下载PDF
Modeling compression behaviors of freeze-thaw-impacted soils extending the disturbed state concept 认领 引用
8
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
暂未订购 下载PDF
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
9
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
暂未订购 下载PDF
Numerically and Experimentally Establishing Rheology Law for AISI 1045 Steel Based on Uniaxial Hot Compression Tests 认领 引用
10
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
暂未订购 下载PDF
Reverse size effect on unconfined compressive strength of red-bed rocks using micro-CT technique 认领 引用 被引量：1
11
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)
暂未订购 下载PDF
Experimental and Numerical Study on Mechanical Properties of Three-dimensional Plate-frame and Truss Honeycomb 认领 引用
12
作者 LI Qian-ning XU Lin-zhi +6 位作者 ZHANG Yi-heng HU Peng-cheng WU Wen-hua LI Chun-bao CHEN Wei LI Pu LI Xiao-bin 《船舶力学》 EI CSCD 北大核心 2026年第6期970-983,共14页
With in-depth research on honeycomb structures for ship protection,diverse 3D honeycomb configurations have emerged.This paper aims to explore the traits of different 3D honeycomb designs and offer ideas for the futur... With in-depth research on honeycomb structures for ship protection,diverse 3D honeycomb configurations have emerged.This paper aims to explore the traits of different 3D honeycomb designs and offer ideas for the future structural layouts.Both experimental tests and numerical analysis on the mechanical properties of 3D plate-frame and truss honeycombs were carried out.The test samples,made of nylon via laser sintering in an additive manufacturing process,underwent quasi-static compression tests to uncover the disparities in deformation patterns between the two honeycombs.By closely examining typical cell deformations during compression,the differences in failure modes were revealed.Because the load-bearing capacity of a structure and its density,the authors while studying these two types of honeycombs,also explored the relationship between the specific stiffness and nominal density of various typical 2D and 3D structures.Finally,a parametric analysis was performed to assess the impact of internal concavity angles,cell thicknesses,and materials on mechanical properties. 展开更多
关键词 cellular solids compression testing additive manufacturing negative Poisson's ratio plateframe and truss honeycomb
暂未订购 下载PDF
Particle simulation of the failure process of brittle rock under triaxial compression 认领 引用 被引量：21
13
作者 Ming Xia Ke-ping Zhou 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 2010年第5期507-513,共7页
In order to investigate the failure process of brittle rock under triaxial compression through both experimental and numerical approaches, the particle simulation method was used in numerical simulations and the simul... In order to investigate the failure process of brittle rock under triaxial compression through both experimental and numerical approaches, the particle simulation method was used in numerical simulations and the simulated results were compared with those of the experiment. The numerical simulation results, such as fracture propagation, microcrack distribution, stress-strain response, and damage patterns, were discussed in detail. The simulated results under various confining pressures （0-60 MPa） are in good agreement with the experimental results. The simulated results reveal that rock failure is caused by axial splitting under uniaxial compression. As the confining pressure increases, rock failure occurs in a few localized shear planes and the rock mechanical behavior is changed from brittle to ductile. Consequently, the peak failure strength, microcrack numbers, and the shear plane angle increase, but the ratio of tensile to shear microcracks decreases. The damage formation during the compression simulations indicates that the particle simulation method can produce similar behaviors as those observed through laboratory compression tests. 展开更多
关键词 rock mechanics compression testing failure fracture modes simulation microcracks
暂未订购 下载PDF
Discrete element method for investigating the borehole wall rock failure process based on the enhancement effect of microbial drilling fluids 认领 引用
14
作者 Zehua Du Zhijun Li +4 位作者 Yanyan Huang Jianhua Yue Zhuyi Liao Xiang Yang Sheng Wang 《Petroleum》 EI CAS CSCD 2026年第3期394-405,共12页
Borehole wall instability in unconsolidated formations is a critical challenge in drilling engineering and requires urgent attention.Microbially induced calcium carbonate precipitation(MICP)is a promising solution for... Borehole wall instability in unconsolidated formations is a critical challenge in drilling engineering and requires urgent attention.Microbially induced calcium carbonate precipitation(MICP)is a promising solution for reinforcing unstable formations.However,the microscopic mechanisms responsible for borehole wall re-failure after MICP treatment remain unclear.The discrete element method(DEM)model provides an effective means for investigating such processes.In this study,a DEM model was created using vaterite,a form of calcium carbonate,to simulate the compressive failure process under unconfined conditions.During the simulations,the stress,strain,discrete fracture networks(DFN),fragment count,coordination number,contact number,average normal contact force,and bond breakage of the specimens were recorded to understand the microscopic behavior of core failure after MICP enhancement by microbial drilling fluids.The simulation results showed that the proposed DEM model can effectively simulate the failure behavior of cores post-MICP enhancement using microbial drilling fluids.As the calcium carbonate content increased,the peak strength occurred at a larger strain.Furthermore,the peak strength itself increased,and the brittleness of the specimens became more pronounced.The reduction in specimen strength was primarily attributed to the development of DFN and breakage of vaterite–sand particle bonds.Moreover,more concentrated and frequent DFN corresponded to a more rapid decline in the strength of the specimen.The tensile stress at the vaterite–sand and vaterite–vaterite contacts played a crucial role in maintaining the strength of the core specimen,and specimens with a greater number of uniformly distributed contacts showed improved core strength.This study provides new insights into the failure mechanisms of microbial drilling of fluid-enhanced sand in unconsolidated formations. 展开更多
关键词 MICP DEM Microbial drilling fluid Vaterite Unconfined compressive test
暂未订购 下载PDF
Constitutive relationship of IN690 superalloy by using uniaxial compression tests 认领 引用 被引量：15
15
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
暂未订购 下载PDF
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
16
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
暂未订购 下载PDF
Deformability characteristics of jointed rock masses under uniaxial compression 认领 引用 被引量：51
17
作者 Chen Xin Liao Zhihong Peng Xi 《International Journal of Mining Science and Technology》 EI CAS 2012年第2期213-221,共9页
We investigated the combined influence of joint inclination angle and joint continuity factor on deforma- tion behavior of jointed rock mass for gypsum specimens with a set of non-persistent open flaws in uni- axial c... We investigated the combined influence of joint inclination angle and joint continuity factor on deforma- tion behavior of jointed rock mass for gypsum specimens with a set of non-persistent open flaws in uni- axial compression. Complete axial stress-strain curves were classified into four types, i.e., single peak, softening after multi-peak yield platform, hardening after multi-peak yield platform and multi-peak dur- ing softening. Observation of crack evolution on the specimen surface reveals that the deformation behavior is correlated to the closure of pre-existing joint, development of fractures in rock matrix and teeth shearing of the shear plane. To investigate the brittleness of the specimens, the ratio of the residual strength to the maximum peak strength as well as the first and last peak strains were studied. At the same joint inclination angle, the ratios between residual strength and the maximum peak strength and the last peak strains increased while the first peak strain decreased with the increase of joint continuity factor. At the same joint continuity factor, the curves of the three brittleness parameters vs. joint inclina- tion angle can either be concave or convex single-oeak or wave-shaoed. 展开更多
关键词 Rock mass Joint inclination angle Joint connectivity Uniaxial compression test Axial stress-strain curve
暂未订购 下载PDF
Microstructure and compression properties of fine Al2O3 particles dispersion strengthened molybdenum alloy 认领 引用 被引量：7
18
作者 Tie-long SUN Liu-jie XU +4 位作者 Shi-zhong WEI Kun-ming PAN Wu-hui LI Yu-cheng ZHOU Zhi-min HUANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第12期3307-3321,共15页
The Mo alloys reinforced by Al2O3 particles were fabricated by hydrothermal synthesis and powder metallurgy. The microstructures of Mo-Al2O3 alloys were studied by using XRD, SEM and TEM. The results show that Al2O3 p... The Mo alloys reinforced by Al2O3 particles were fabricated by hydrothermal synthesis and powder metallurgy. The microstructures of Mo-Al2O3 alloys were studied by using XRD, SEM and TEM. The results show that Al2O3 particles, existing as a stable hexagonal phase(α-Al2O3), are uniformly dispersed in Mo matrix. The ultrafine α-Al2O3 particles remarkably refine grain size and increase dislocation density of Mo alloys. Moreover, a good interfacial bonding zone between α-Al2O3 and Mo grain is obtained. The crystallographic orientations of the interface of the Al2O3 particles and Mo matrix are [111]a-Al2O3//[111]Mo and(112)a-Al2O3//(0 11)Mo. Due to the effect of secondary phase and dislocation strengthening, the yield strength of Mo-2.0 vol.%Al2O3 alloy annealed at 1200 ℃ is approximately 56.0% higher than that of pure Mo. The results confirm that the addition of Al2O3 particles is a promising method to improve the mechanical properties of Mo alloys. 展开更多
关键词 Mo−Al2O3 alloys hydrothermal synthesis interface compression test dispersion strengthening
暂未订购 下载PDF
Frictional behavior during cold ring compression process of aluminum alloy 5052 认领 引用 被引量：13
19
作者 Dawei ZHANG Guangcan YANG Shengdun ZHAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第5期47-64,共18页
The friction is the considerable boundary condition in bulk metal forming.In this paper,the ring compression test was used to evaluate the friction coefficient and factor in Coulomb friction model and Tresca friction ... The friction is the considerable boundary condition in bulk metal forming.In this paper,the ring compression test was used to evaluate the friction coefficient and factor in Coulomb friction model and Tresca friction model for the plastic deformation of aluminum alloy AA5052.The micro-macro analysis method combining surface morphology and micro-texture was used to explore the friction behaviors in AA5052 cold forming process.In general,the magnitude(μor m)of friction changes before and after a deformation threshold during ring compression.The maximum change rate of the magnitude(μor m)before and after the deformation threshold is close to 18.5%under the present experimental conditions,and the change rate decreases with increasing loading speed.The lubrication using MoS2 is better than that using oil at lower speeds(0.15 mm/s,1.5 mm/s),but the lubrications for MoS2 and oil are similar at higher speeds(15 mm/s).The surface roughness,three-dimensional topography,and surface texture of compressed ring have a sudden change around the deformation threshold,which deviate from the previous evolution trend.The increased friction after deformation threshold also promotes the formation of sufficient shear strain layer in the subsurface plane of the compressed ring,and then it hinders the formation of the typical deformation textures withβ-oriented line and promotes the appearance of shear textures such as{001}(110),{111}(uvw)and{hkl}{110)textures. 展开更多
关键词 Deformation threshold Magnitude of friction Ring compression test Shear texture Surface feature
暂未订购 下载PDF
Experimental study on cracking behaviour of moulded gypsum containing two non-parallel overlapping flaws under uniaxial compression 认领 引用 被引量：13
20
作者 Lekan Olatayo Afolagboye Jianming He Sijing Wang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2017年第2期394-405,共12页
Failure of rock mass that is subjected to compressive loads occurs from initiation, propagation, and linkage of new cracks from preexisting fissures. Our research investigates the cracking behaviour and coalescence pr... Failure of rock mass that is subjected to compressive loads occurs from initiation, propagation, and linkage of new cracks from preexisting fissures. Our research investigates the cracking behaviour and coalescence process in a brittle material with two non-parallel overlapping flaws using a high-speed camera. The coalescence tensile crack and tensile wing cracks were the first cracks to occur from the preexisting flaws. The initiation stresses of the primary cracks at the two tips of each flaw were simultaneous and decreased with reduced flaw inclination angle. The following types of coalescence cracks were identified between the flaws: primary tensile coalescence crack, tensile crack linkage, shear crack linkage, mixed tensile-shear crack, and indirect crack coalescence. Coalescence through tensile linkage occurred mostly at pre-peak stress. In contrast, coalescence through shear or mixed tensile-shear cracks occurred at higher stress. Overall, this study indicates that the geometry of preexisting flaws affect crack initiation and coalescence behaviour. 展开更多
关键词 Crack coalescence Moulded gypsum Non-parallel flaws Primary cracks Uniaxial compression test
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 7 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈