Theoretical study on damage bifurcation of unstable failure process of quasi-brittle materials

摘要：

To obtain the damage effect in the process of elastoplasticity deformation of quasi-brittle materials, the isotropic damage loading-unloading function and damage variable were introduced to non-continuous bifurcation. The critical bifurcation orientation and its corresponding hardening modulus for quasi-brittle materials were derived considering the effect of stiffness degradation and volumetric dilatancy under the assumption of isotropic damage. The relationships of localized orientation angle and maximal hardening modulus dependent on degree of damage and initial Poissons ratio of rock were explored. Comparative analyses were conducted to study the bifurcation of uniaxial tension-compression samples under the conditions of plane stress and plane strain. It is shown that as the initial Poissons ratio or degree of damage increases, the localization orientation angle of the plane uniaxial compression sample tends to be initiated to decrease. However, the localization orientation angle of the plane uniaxial tension sample tends to be initiated to increase. The sum of orientation angle under tension and compression conditions is 90°. There are plane stress and plane strain cases of the maximum hardening modulus that is independent of the uniaxial compression and tension.

关键词： isotropic damage orientation of localization mazimum hardening modulus bifurcation uniazial sample

作者: WANG Zhong-chang ZHAO De-shen YANG Qing

作者单位: Key Laboratory for Prediction & Control on Complicated Structure System of Education Department of L Key Laboratory for Prediction & Control on Complicated Structure System of Education Department of L Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering,Dalian University o

会议类型: 国际会议

会议名称: 2009 Frontier Symposium of China Postductors on Materrials Science(2009年中国博士后材料科学前言论坛)

会议地点: 长沙

会议语种:英文

页码: 811-818

在线出版日期: 2009-11-22（万方平台首次上网日期，不代表论文的发表时间）