Shear banding analysis of geomaterials by strain gradient enhanced damage model | |
Zhao, JD ; Sheng, DC ; Zhou, WY | |
2010-05-11 ; 2010-05-11 ; OCT | |
关键词 | damage localization strain gradient plasticity discontinuous bifurcation second-order characteristic surface geomaterials MICRO-STRUCTURE PLASTICITY LOCALIZATION DEFORMATION MECHANICS ELASTICITY CONTINUUM Mechanics |
中文摘要 | Shear band localization is investigated by a strain-gradient-enhanced damage model for quasi-brittle geomaterials. This model introduces the strain gradients and their higher-order conjugate stresses into the framework of continuum damage mechanics. The influence of the strain gradients on the constitutive behaviour is taken into account through a generalized damage evolutionary law. A weak-form variational principle is employed to address the additional boundary conditions introduced by the incorporation of the strain gradients and the conjugate higher-order stresses. Damage localization under simple shear condition is analytically investigated by using the theory of discontinuous bifurcation and the concept of the second-order characteristic surface. Analytical solutions for the distributions of strain rates and strain gradient rates, as well as the band width of localised damage are found. Numerical analysis demonstrates the shear band width is proportionally related to the internal length scale through a coefficient function of Poisson's ratio and a parameter representing the shape of uniaxial stress-strain curve. It is also shown that the obtained distributions of strains and strain gradients are well in accordance with the underlying assumptions for the second-order discontinuous shear band boundary and the weak discontinuous bifurcation theory. (c) 2005 Elsevier Ltd. All rights reserved. |
语种 | 英语 ; 英语 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND |
内容类型 | 期刊论文 |
源URL | [http://hdl.handle.net/123456789/27500] |
专题 | 清华大学 |
推荐引用方式 GB/T 7714 | Zhao, JD,Sheng, DC,Zhou, WY. Shear banding analysis of geomaterials by strain gradient enhanced damage model[J],2010, 2010, OCT. |
APA | Zhao, JD,Sheng, DC,&Zhou, WY.(2010).Shear banding analysis of geomaterials by strain gradient enhanced damage model.. |
MLA | Zhao, JD,et al."Shear banding analysis of geomaterials by strain gradient enhanced damage model".(2010). |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论