Mechanics of Cohesive-frictional Materials最新文献

Damage model for concrete-like materials coupling cracking and friction, contribution towards structural damping: first uniaxial applications 类混凝土材料耦合开裂和摩擦的损伤模型，对结构阻尼的贡献：首次单轴应用

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-13 DOI: 10.1002/1099-1484(200011)5:8<607::AID-CFM108>3.0.CO;2-K

F. Ragueneau, Ch. La Borderie, J. Mazars

{"title":"Damage model for concrete-like materials coupling cracking and friction, contribution towards structural damping: first uniaxial applications","authors":"F. Ragueneau, Ch. La Borderie, J. Mazars","doi":"10.1002/1099-1484(200011)5:8<607::AID-CFM108>3.0.CO;2-K","DOIUrl":"https://doi.org/10.1002/1099-1484(200011)5:8<607::AID-CFM108>3.0.CO;2-K","url":null,"abstract":"This paper is concerned with the development of a damage model for concrete materials exhibiting a residual hysteretic behaviour at a fixed level of damage. This feature is obtained by coupling damage mechanics and friction phenomena. In its complete form, the damage variable by means of which the stiffness decrease is obtained in an orthotropic second-order tensor. Its evolution is governed by the tensile part of the strain tensor. The sliding between the crack lips is assumed to have a plasticity-like behaviour with non-linear kinematic hardening. The sliding stress depends on the level of damage. Such a model assumes the evolution of two yield surfaces: a fracture one and a sliding one. If unilateral effects need to be taken into account for cyclic loading analysis (crack closure modelling), the damage evolution remains isotropic. The effectiveness of this model in reproducing a part of damping when subjected to dynamic loading is exemplified through two structural case studies. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/1099-1484(200011)5:8<607::AID-CFM108>3.0.CO;2-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72360347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 110

Computational Geomechanics with Special Reference to Earthquake Engineering, by O. C. Zienkiewicz, A. H. C. Chan, M. Pastor, B. A. Schrefler, T. Shiomi, by John Wiley, New York, 1999. ISBN 0-471-98285-7. GBP £100.00. 《计算地质力学与地震工程特别参考》，O.C.Zienkiewicz、A.H.C.Chan、M.Pastor、B.A.Schrefler、T.Shiomi著，John Wiley著，纽约，1999年。是0-471-98285-7。GBP 100.00英镑。

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-13 DOI: 10.1002/1099-1484(200011)5:8<673::AID-CFM112>3.0.CO;2-5

Prof I. M. Smith

引用次数: 3

Instabilities in granular materials and application to landslides 颗粒材料的不稳定性及其在滑坡中的应用

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-13 DOI: 10.1002/1099-1484(200011)5:8<627::AID-CFM109>3.0.CO;2-F

F. Darve, F. Laouafa

{"title":"Instabilities in granular materials and application to landslides","authors":"F. Darve, F. Laouafa","doi":"10.1002/1099-1484(200011)5:8<627::AID-CFM109>3.0.CO;2-F","DOIUrl":"https://doi.org/10.1002/1099-1484(200011)5:8<627::AID-CFM109>3.0.CO;2-F","url":null,"abstract":"Landslides or questions related to slope stability are usually considered in the framework of plastic limit analyses. Recent progress has made it possible to describe some failure modes in the framework of the theories of bifurcation of the strain mode by plastic strain localization and the shear-banding phenomenon. We propose in this paper to reconsider the question of landslide analysis by taking into account an appropriate instability criterion. As soils are strongly non-associated materials, unstable states can be reached strictly inside the plastic limit condition (which defines the set of admissible stresses). In the first part of this paper, we describe the constitutive model. Then Lyapunov's definition of stability allows us to detect unstable stress–strain states from experimental evidence. These unstable states are analysed by considering the sign of the second-order work. The stability analysis, performed for loose and dense sands under plane strain conditions, shows a large domain of instabilities in the stress space. This method is applied to some boundary-value problems by finite elements computations. It is shown finally by examples that such unstable stress–strain states are observed in our FEM modelling of slope problems. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/1099-1484(200011)5:8<627::AID-CFM109>3.0.CO;2-F","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72315814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 142

Modelling of solid-phase sintering of hardmetal using a mesomechanics approach 用细观力学方法模拟硬质合金固相烧结

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-13 DOI: 10.1002/1099-1484(200011)5:8<653::AID-CFM111>3.0.CO;2-A

Lennart Mähler, Kenneth Runesson

{"title":"Modelling of solid-phase sintering of hardmetal using a mesomechanics approach","authors":"Lennart Mähler, Kenneth Runesson","doi":"10.1002/1099-1484(200011)5:8<653::AID-CFM111>3.0.CO;2-A","DOIUrl":"https://doi.org/10.1002/1099-1484(200011)5:8<653::AID-CFM111>3.0.CO;2-A","url":null,"abstract":"The mesomechanics approach presented in this paper aims at enhancing the understanding of, as well as providing a predicting capability for, the densification process in cemented carbides due to solid-phase sintering. The major mesostructural constituents are tungsten carbide (WC) particles and large pores, which are embedded in a contiguous cobolt (Co) matrix. A preprocessor code, which is based on Voronoi polygonization, was developed to generate the morphology with prescribed area fraction and size distribution of the constituents. In a continuum model, the ‘driving force’ that brings about the densification is the sintering stress, which is given a rational thermodynamic definition in the paper. This stress represents the boundary loading of a representative volume element (RVE) at free sintering, i.e. in the absence of macroscopic stresses. In such a volume element (or unit cell) the constituents WC and Co are assumed as viscoplastic non-porous solids. A generalized Bingham model (of Norton-type with hardening) seems to be sufficient to represent the creep properties, which are assumed to be of dislocation as well as of diffusion type. The temperature dependence of certain material parameters is discussed. Thermal expansion is accounted for. The developed algorithm was implemented in the commercial FE-code ABAQUS. Finally, the simulation results are compared with experimental results from the sintering of free as well as uniaxially loaded specimens. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/1099-1484(200011)5:8<653::AID-CFM111>3.0.CO;2-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72360348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Modelling of solid‐phase sintering of hardmetal using a mesomechanics approach 用细观力学方法模拟硬质合金固相烧结

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-01 DOI: 10.1002/1099-1484(200011)5:8<653::AID-CFM111>3.0.CO;2-A

L. Mähler, K. Runesson

{"title":"Modelling of solid‐phase sintering of hardmetal using a mesomechanics approach","authors":"L. Mähler, K. Runesson","doi":"10.1002/1099-1484(200011)5:8<653::AID-CFM111>3.0.CO;2-A","DOIUrl":"https://doi.org/10.1002/1099-1484(200011)5:8<653::AID-CFM111>3.0.CO;2-A","url":null,"abstract":"The mesomechanics approach presented in this paper aims at enhancing the understanding of, as well as providing a predicting capability for, the densification process in cemented carbides due to solid-phase sintering. The major mesostructural constituents are tungsten carbide (WC) particles and large pores, which are embedded in a contiguous cobolt (Co) matrix. A preprocessor code, which is based on Voronoi polygonization, was developed to generate the morphology with prescribed area fraction and size distribution of the constituents. In a continuum model, the ‘driving force’ that brings about the densification is the sintering stress, which is given a rational thermodynamic definition in the paper. This stress represents the boundary loading of a representative volume element (RVE) at free sintering, i.e. in the absence of macroscopic stresses. In such a volume element (or unit cell) the constituents WC and Co are assumed as viscoplastic non-porous solids. A generalized Bingham model (of Norton-type with hardening) seems to be sufficient to represent the creep properties, which are assumed to be of dislocation as well as of diffusion type. The temperature dependence of certain material parameters is discussed. Thermal expansion is accounted for. The developed algorithm was implemented in the commercial FE-code ABAQUS. Finally, the simulation results are compared with experimental results from the sintering of free as well as uniaxially loaded specimens. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73991686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Computational Geomechanics with Special Reference to Earthquake Engineering, by O. C. Zienkiewicz, A. H. C. Chan, M. Pastor, B. A. Schrefler, T. Shiomi, by John Wiley, New York, 1999. ISBN 0-471-98285-7. GBP £100.00. 计算地质力学与地震工程的特别参考，o.c. Zienkiewicz, a.h.c. Chan, M. Pastor, b.a. Schrefler, T. Shiomi, by John Wiley，纽约，1999。ISBN 0-471-98285-7。£100.00英镑。

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-01 DOI: 10.1002/1099-1484(200011)5:8<673::AID-CFM112>3.0.CO;2-5

I. Smith

引用次数: 3

Damage model for concrete‐like materials coupling cracking and friction, contribution towards structural damping: first uniaxial applications 类混凝土材料耦合开裂和摩擦的损伤模型，对结构阻尼的贡献:第一个单轴应用

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-01 DOI: 10.1002/1099-1484(200011)5:8<607::AID-CFM108>3.0.CO;2-K

F. Ragueneau, C. Borderie, J. Mazars

{"title":"Damage model for concrete‐like materials coupling cracking and friction, contribution towards structural damping: first uniaxial applications","authors":"F. Ragueneau, C. Borderie, J. Mazars","doi":"10.1002/1099-1484(200011)5:8<607::AID-CFM108>3.0.CO;2-K","DOIUrl":"https://doi.org/10.1002/1099-1484(200011)5:8<607::AID-CFM108>3.0.CO;2-K","url":null,"abstract":"This paper is concerned with the development of a damage model for concrete materials exhibiting a residual hysteretic behaviour at a fixed level of damage. This feature is obtained by coupling damage mechanics and friction phenomena. In its complete form, the damage variable by means of which the stiffness decrease is obtained in an orthotropic second-order tensor. Its evolution is governed by the tensile part of the strain tensor. The sliding between the crack lips is assumed to have a plasticity-like behaviour with non-linear kinematic hardening. The sliding stress depends on the level of damage. Such a model assumes the evolution of two yield surfaces: a fracture one and a sliding one. If unilateral effects need to be taken into account for cyclic loading analysis (crack closure modelling), the damage evolution remains isotropic. The effectiveness of this model in reproducing a part of damping when subjected to dynamic loading is exemplified through two structural case studies. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88695180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 109

Instabilities in granular materials and application to landslides 颗粒材料的不稳定性及其在滑坡中的应用

Mechanics of Cohesive-frictional Materials Pub Date : 2000-11-01 DOI: 10.1002/1099-1484(200011)5:8<627::AID-CFM109>3.0.CO;2-F

F. Darve, F. Laouafa

{"title":"Instabilities in granular materials and application to landslides","authors":"F. Darve, F. Laouafa","doi":"10.1002/1099-1484(200011)5:8<627::AID-CFM109>3.0.CO;2-F","DOIUrl":"https://doi.org/10.1002/1099-1484(200011)5:8<627::AID-CFM109>3.0.CO;2-F","url":null,"abstract":"Landslides or questions related to slope stability are usually considered in the framework of plastic limit analyses. Recent progress has made it possible to describe some failure modes in the framework of the theories of bifurcation of the strain mode by plastic strain localization and the shear-banding phenomenon. We propose in this paper to reconsider the question of landslide analysis by taking into account an appropriate instability criterion. As soils are strongly non-associated materials, unstable states can be reached strictly inside the plastic limit condition (which defines the set of admissible stresses). In the first part of this paper, we describe the constitutive model. Then Lyapunov's definition of stability allows us to detect unstable stress–strain states from experimental evidence. These unstable states are analysed by considering the sign of the second-order work. The stability analysis, performed for loose and dense sands under plane strain conditions, shows a large domain of instabilities in the stress space. This method is applied to some boundary-value problems by finite elements computations. It is shown finally by examples that such unstable stress–strain states are observed in our FEM modelling of slope problems. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80907125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 141

The characterization of marble by cyclic compression loading: experimental results 大理岩循环压缩加载特性研究:实验结果

Mechanics of Cohesive-frictional Materials Pub Date : 2000-10-01 DOI: 10.1002/1099-1484(200010)5:7<535::AID-CFM102>3.0.CO;2-D

G. Royer-Carfagni, W. Salvatore

{"title":"The characterization of marble by cyclic compression loading: experimental results","authors":"G. Royer-Carfagni, W. Salvatore","doi":"10.1002/1099-1484(200010)5:7<535::AID-CFM102>3.0.CO;2-D","DOIUrl":"https://doi.org/10.1002/1099-1484(200010)5:7<535::AID-CFM102>3.0.CO;2-D","url":null,"abstract":"The degradation process of natural stones is reproduced by performing low-cycle-number, uniaxial compression fatigue tests on three different qualities of marble. A typical feature of fatigue tests is that repetition of loading cycles produces a progressive accumulation of permanent strain in the specimen, rather than any significant decay in the material's elastic moduli. This permanent deformation has been recognized as both due to the opening of micro-cracks as well as due to shear-like mechanisms. The relative contribution of each of these mechanisms to the overall behaviour of the materials depends heavily upon the orientation of the rift plane of the specimen, that is, whether the specimen has been cut with its axis orthogonal to the marble rift plane or parallel to it. In the first case, shear-like deformations are the most evident signs of the failure mechanism, while in the second, the marked increases in volume due to micro-cracking are evident early. Scanning electron microscope studies performed, evidence that there are two different phases in the marble's behaviour: the first one is characterized by calcite grain decohesion, that is, the grains remain integral, but detach along their interfaces upon repeated load cycles (grain de-cohesion); while in the second stage, there are evident signs of transgranular micro-cracking. These two distinct phases are shown to correlate with different stages in the material's macroscopic response to cyclic loading. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90778289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 40

Mechanical behaviour of a porous chalk and effect of saturating fluid 多孔白垩的力学特性及饱和流体的影响

Mechanics of Cohesive-frictional Materials Pub Date : 2000-10-01 DOI: 10.1002/1099-1484(200010)5:7<583::AID-CFM110>3.0.CO;2-J

S. Homand, J. Shao

{"title":"Mechanical behaviour of a porous chalk and effect of saturating fluid","authors":"S. Homand, J. Shao","doi":"10.1002/1099-1484(200010)5:7<583::AID-CFM110>3.0.CO;2-J","DOIUrl":"https://doi.org/10.1002/1099-1484(200010)5:7<583::AID-CFM110>3.0.CO;2-J","url":null,"abstract":"This paper presents an experimental investigation and numerical modelling of the behaviour of a porous chalk by taking into account effects of saturating fluid. Two representative fluids, oil and water are considered. The laboratory testing programme includes two topics. First, conventional hydrostatic and triaxial compression tests are carried out on samples which are saturated with water and oil, respectively. The sensitivity of chalk behaviour to saturating fluid is clearly shown. Secondly, specific water injection tests are conducted in which water is injected into chalk samples initially saturated by oil, under different hydrostatic and deviatoric stress states. Additional plastic deformation induced by water flooding is determined. In the second part of paper, an elastoplastic model with two yield surfaces is proposed. The water-induced plastic deformation is described by introducing an additional plastic mechanism related to the behaviour jump between two material states of chalk. An overall good correlation is obtained between numerical simulations and experimental data not only for conventional tests, but also for water injection tests. Copyright © 2000 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85519281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 48