摘要
基于统一弹塑性本构模型的有限元理论格式,根据ABAQUS的UMAT格式要求,编制相应的接口程序,将统一弹塑性本构模型引入ABAQUS中。采用退化的统一强度模型(b=0时,为Mohr-Coulomb模型)与ABAQUS自带的Mohr-Coulomb模型,对单轴试验和圆形硐室进行弹塑性分析,验证所开发材料子程序的正确性及高效性。考虑到统一强度模型的一般情况(b≠0)和屈服面硬化条件,对圆形硐室进行弹塑性计算,得到应力场的变化规律。所提出的研究思路具有普遍性,为采用ABAQUS平台进行本构模型的二次开发提供了借鉴和参考。
Based on finite element theoretical scheme of tmified elastoplastic constitutive model, and according to the UMAT interface requirement of ABAQUS, the corresponding UMAT codes are programmed, which will be called by the main analytical module of ABAQUS. Adopting degenerative model of the unified strength （b = 0, Mohr-Coulomb model） and the built-in Mohr-Coulomb model of ABAQUS, the uniaxial tests and circular chamber are analyzed to verify the correctness and efficiency of the developed material subroutine. Finally, considering the general situation form of unified elastoplastic constitutive model （ b ≠ 0 ） and hard condition of yield surface, which are not available in ABAQUS software, circular chamber is simulated and variational discipline of stress field is obtained. The provided basic procedures and programming essentials of the UMAT redefining in ABAQUS are universal and can offer a reference for other developers.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第4期1092-1098,共7页
Rock and Soil Mechanics
