岩土力学2012，Vol.33Issue(4)：1240-1246,7.
各向异性弹黏塑性模型在ABAQUS中的研发
Development of anisotropic elasto-viscoplastic model in ABAQUS software
摘要
Abstract
This paper presents an improved three-dimensional anisotropic elasto-viscoplastic constitutive model which is based on overstress theory of Perzyna and critical state theory. In this model a rotational hardening law of Wheeler is also adopted to account for initial anisotropy and changes in anisotropy due to stress. The viscoplastic strain will not occur when the stress state is located within the static yield surface. A power-type scaling function is adopted for the viscoplastic strain-rate. The constitutive model is programmed in ABAQUS software by writing UMAT subroutine, which is integrated with Return Mapping Algorithm. Anisotropically consolidated undrained (CU) triaxial creep test for Sackville clay is simulated by proposed model and the suitable integration time step is determined. Then other CU triaxial creep tests and CU triaxial constant strain rate tests are simulated. By switching the anisotropic features off, the proposed model is degraded to the isotropic model. The simulation results show (1) The CU triaxial creep tests with rotational hardening law is more accurate than isotropic model in the high level of the shear stress; (2) The CU triaxial constant strain rate tests rationally reflect that the undrained strength of soil increase with loading rate.关键词
各向异性/弹黏塑性模型/回映算法/ABAQUS软件/UMAT子程序Key words
Anisotropic/ Elastic-viscoplastic/ return mapping algorithm/ ABAQUS software/ UMAT subroutine分类
建筑与水利引用本文复制引用
钦亚洲,李宁,许建聪..各向异性弹黏塑性模型在ABAQUS中的研发[J].岩土力学,2012,33(4):1240-1246,7.基金项目
国家自然科学基金资助(No.40872179). （No.40872179）
