Mechanics of Cohesive-frictional Materials最新文献_第9页

A constitutive model for compaction of granular media, with account for deformation induced anisotropy 考虑变形诱导各向异性的粒状介质压实本构模型

Mechanics of Cohesive-frictional Materials Pub Date : 1999-07-01 DOI: 10.1002/(SICI)1099-1484(199907)4:4<391::AID-CFM68>3.0.CO;2-0

J. Brandt, L. Nilsson

引用次数: 65

Validation of a plasticity bond model for steel reinforcement 钢筋塑性粘结模型的验证

Mechanics of Cohesive-frictional Materials Pub Date : 1999-07-01 DOI: 10.1002/(SICI)1099-1484(199907)4:4<361::AID-CFM66>3.0.CO;2-F

J. Cox, L. Herrmann

引用次数: 29

Isotropic and anisotropic descriptions of damage in concrete structures 混凝土结构损伤的各向同性和各向异性描述

Mechanics of Cohesive-frictional Materials Pub Date : 1999-07-01 DOI: 10.1002/(SICI)1099-1484(199907)4:4<339::AID-CFM65>3.0.CO;2-J

Stéphanie Fichant, C. Borderie, G. Pijaudier-Cabot

{"title":"Isotropic and anisotropic descriptions of damage in concrete structures","authors":"Stéphanie Fichant, C. Borderie, G. Pijaudier-Cabot","doi":"10.1002/(SICI)1099-1484(199907)4:4<339::AID-CFM65>3.0.CO;2-J","DOIUrl":"https://doi.org/10.1002/(SICI)1099-1484(199907)4:4<339::AID-CFM65>3.0.CO;2-J","url":null,"abstract":"Scalar damage models are very often implemented in computational analyses in order to predict the response and failure modes of concrete and reinforced concrete structures. In most situations, however, damage is not isotropic but has preferential directions. Therefore, there have been many questions about the pertinence and range of applicability of isotropic, scalar, damage models for describing a degradation process which is strongly geometrically oriented. In order to assess what are the limitations of such a simplifying assumption, a comparative study is presented. The constitutive relations used for this purpose derive from the same class of models with a gradual enhancement of the description of damage. The scalar damage model is compared to another model where damage-induced orthotropy is described, with the possibility of rotation of the principle axes of orthotropy. Both models incorporate crack closure effects and a plasticity damage coupling. Structural analyses on bending beams, compression-shear and tension-shear concrete panels are presented. Although it may appear to be simplistic, the scalar damage model provides accurate predictions when failure is mainly due to uniaxial extension. Crack closure introduces an additional anisotropy which is important in compression-shear problems. Finally, damage-induced anisotropy seems important when failure is due to multiaxial extensions, such as in shear-tension problems. Copyright © 1999 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":"12 1","pages":"339-359"},"PeriodicalIF":0.0,"publicationDate":"1999-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75659316","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: 139

Modelling the large deformations in stratified media—the Cosserat continuum approach 分层介质中大变形的建模——Cosserat连续体方法

Mechanics of Cohesive-frictional Materials Pub Date : 1999-05-26 DOI: 10.1002/(SICI)1099-1484(199905)4:3<195::AID-CFM59>3.0.CO;2-%23

D. P. Adhikary, Dr. H.-B. Mühlhaus, A. V. Dyskin

{"title":"Modelling the large deformations in stratified media—the Cosserat continuum approach","authors":"D. P. Adhikary, Dr. H.-B. Mühlhaus, A. V. Dyskin","doi":"10.1002/(SICI)1099-1484(199905)4:3<195::AID-CFM59>3.0.CO;2-%23","DOIUrl":"https://doi.org/10.1002/(SICI)1099-1484(199905)4:3<195::AID-CFM59>3.0.CO;2-%23","url":null,"abstract":"Methods employing continuum approximation in describing the deformation of layered materials possess a clear advantage over explicit models. However, the conventional implicit models based on the theory of anisotropic continua suffers from certain difficulties associated with interface slip and internal instabilities. These difficulties can be remedied by considering the bending stiffness of the layers. This implies the introduction of moment (couple) stresses and internal rotations, which leads to a Cosserat-type theory. In the present model, the behaviour of the layered material is assumed to be linearly elastic; the interfaces are assumed to be elastic perfectly plastic. Conditions of slip or no slip at the interfaces are detected by a Coulomb criterion with tension cut off at zero normal stress. The theory is valid for large deformation analysis. The model is incorporated into the finite element program AFENA and validated against analytical solutions of elementary buckling problems in layered medium. A problem associated with buckling of the roof and the floor of a rectangular excavation in jointed rock mass under high horizontal in situ stresses is considered as the main application of the theory. Copyright © 1999 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":"4 3","pages":"195-213"},"PeriodicalIF":0.0,"publicationDate":"1999-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72363343","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: 0

Interparticle forces distribution in granular materials: link with the macroscopic behaviour 颗粒材料中颗粒间力的分布：与宏观行为的联系

Mechanics of Cohesive-frictional Materials Pub Date : 1999-05-26 DOI: 10.1002/(SICI)1099-1484(199905)4:3<247::AID-CFM62>3.0.CO;2-V

Francesco Calvetti, Fabrice Emeriault

{"title":"Interparticle forces distribution in granular materials: link with the macroscopic behaviour","authors":"Francesco Calvetti, Fabrice Emeriault","doi":"10.1002/(SICI)1099-1484(199905)4:3<247::AID-CFM62>3.0.CO;2-V","DOIUrl":"https://doi.org/10.1002/(SICI)1099-1484(199905)4:3<247::AID-CFM62>3.0.CO;2-V","url":null,"abstract":"This paper addresses the modelling of the incremental behaviour of an idealized granular material and its link with the distribution of contact forces within the representative volume. Based on the results obtained from a series of numerical DEM experiments, a discussion of the different operations used in a micro mechanical modelling framework is proposed. First, the relevance of the usual description of the contact forces distribution through its average value for a given contact orientation is evaluated. Next, this description is implemented in a complete homogenization process. The derived stress–strain relationship acceptably predicts the anisotropic elastic properties of the material provided that the particles do not rotate but fails to if this constraint is removed. Therefore, in the last section, a more refined description of the contact forces distribution is invoked, considering the actual scatter from the average values through the standard deviation. Copyright © 1999 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":"4 3","pages":"247-279"},"PeriodicalIF":0.0,"publicationDate":"1999-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/(SICI)1099-1484(199905)4:3<247::AID-CFM62>3.0.CO;2-V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72363344","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: 27

Elasto-plastic modelling of Red Wildmoor sandstone Red Wildmoor砂岩的弹塑性建模

Mechanics of Cohesive-frictional Materials Pub Date : 1999-05-26 DOI: 10.1002/(SICI)1099-1484(199905)4:3<215::AID-CFM61>3.0.CO;2-8

Jean Sulem, Ioannis Vardoulakis, Euripides Papamichos, Ahmed Oulahna, Johan Tronvoll

引用次数: 75

On inelastic behaviour of anisotropic frictional materials 各向异性摩擦材料的非弹性行为

Mechanics of Cohesive-frictional Materials Pub Date : 1999-05-26 DOI: 10.1002/(SICI)1099-1484(199905)4:3<281::AID-CFM63>3.0.CO;2-M

S. Pietruszczak

引用次数: 22

An investigation on the uniqueness of the incremental response of elastoplastic models for virgin sand 原生砂弹塑性模型增量响应的唯一性研究

Mechanics of Cohesive-frictional Materials Pub Date : 1999-05-04 DOI: 10.1002/(SICI)1099-1484(199801)3:1<65::AID-CFM42>3.0.CO;2-9

Silvia Imposimato, Roberto Nova

引用次数: 111

A constitutive model coupling elastoplasticity and damage for cohesive-frictional materials 黏聚摩擦材料弹塑性与损伤耦合的本构模型

Mechanics of Cohesive-frictional Materials Pub Date : 1999-05-04 DOI: 10.1002/(SICI)1099-1484(199801)3:1<41::AID-CFM40>3.0.CO;2-P

C. Chazallon, P. Y. Hicher

{"title":"A constitutive model coupling elastoplasticity and damage for cohesive-frictional materials","authors":"C. Chazallon, P. Y. Hicher","doi":"10.1002/(SICI)1099-1484(199801)3:1<41::AID-CFM40>3.0.CO;2-P","DOIUrl":"10.1002/(SICI)1099-1484(199801)3:1<41::AID-CFM40>3.0.CO;2-P","url":null,"abstract":"In order to model the various phenomena which govern the mechanical response of bonded geomaterials under monotonic loadings, an elastoplastic model coupled with an elastic model with damage was developed, taking into account both the frictional and cohesive aspects of these materials. First, the principles at the base of the model are presented, as well as the physical meaning of the parameters which were used in the elastic model with damage. In order to illustrate the capabilities of the model to reproduce the mechanical behaviour of bonded geomaterials, we simulated triaxial tests on various materials: a deep cemented clay, whose heterogeneity from one specimen to another appeared mainly due to the calcium carbonate content; an assembly of sintered glass balls; and an artificially cemented sand. In this last example, various initial mean stresses allowed us to enlighten the brittle–ductile transition which was modelled by introducing the mean confining pressure in the damage evolution law. We demonstrated that the parameters of each part of the model could be adapted to reproduce the observed general trends. For weak bonds, the elastoplastic part played the predominant role, whereas for strong bonds, the elastic part with damage governed the mechanical behaviour. © 1998 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":"3 1","pages":"41-63"},"PeriodicalIF":0.0,"publicationDate":"1999-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/(SICI)1099-1484(199801)3:1<41::AID-CFM40>3.0.CO;2-P","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90855130","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: 31

Failure design of jointed rock structures by means of a homogenization approach 基于均匀化方法的节理岩体结构破坏设计

Mechanics of Cohesive-frictional Materials Pub Date : 1999-05-04 DOI: 10.1002/(SICI)1099-1484(199807)3:3<207::AID-CFM46>3.0.CO;2-X

Samir Maghous, Patrick de Buhan, Arnaud Bekaert

{"title":"Failure design of jointed rock structures by means of a homogenization approach","authors":"Samir Maghous, Patrick de Buhan, Arnaud Bekaert","doi":"10.1002/(SICI)1099-1484(199807)3:3<207::AID-CFM46>3.0.CO;2-X","DOIUrl":"10.1002/(SICI)1099-1484(199807)3:3<207::AID-CFM46>3.0.CO;2-X","url":null,"abstract":"Conceived as a potential alternative to the methods usually employed for evaluating the stability of jointed rock masses, the homogenization approach developed in this paper stems from the intuitive idea that, from a macroscopic point of view, a rock mass intersected by a regular network of joint surfaces may be perceived as a homogeneous continuum. The failure criterion of such an equivalent medium is theoretically determined from the knowledge of the failure conditions of the individual constituents, namely the intact rock matrix and joint interfaces. Owing to the existence of privileged material directions associated with the joint orientation distribution, this criterion turns out to be of the anisotropic frictional type, as shown by the closed-form expression obtained in the particular case of two mutually orthogonal joint sets. This criterion is then applied to the investigation of two illustrative engineering problems: the calculation of the load-bearing capacity of a shallow foundation on a jointed rock half-space and the stability analysis of an excavation. Both problems are handled by means of the kinematic method of yield design, making use of the previously determined macroscopic failure condition. The upper bound estimates thus derived appear to be significantly better than those obtained from a direct analysis in which the intact rock matrix and joints are considered separately. In spite of some limitations regarding its range of applicability, which are underlined throughout the paper, the homogenization approach may constitute an appropriate general framework for the design of densely jointed rock structures. © 1998 John Wiley & Sons, Ltd.","PeriodicalId":100899,"journal":{"name":"Mechanics of Cohesive-frictional Materials","volume":"3 3","pages":"207-228"},"PeriodicalIF":0.0,"publicationDate":"1999-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/(SICI)1099-1484(199807)3:3<207::AID-CFM46>3.0.CO;2-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87463588","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: 46