土壤剑桥与应变软化本构模型

说明：  本文主要研究了ABAQUS用户子程序UMAT的开发方法，采用FORTRAN语言编制了各向同性硬化材料模型的接口程序，研究该类材料的弹塑性本构关系极其实现方法。(In this paper, the development method of user subroutine UMAT of ABAQUS is studied. The interface program of isotropic hardening material model is compiled by FORTRAN language. The elastic-plastic constitutive relation and its realization method of this kind of material are studied.)

采用Python脚本语言二次开发ABAQUS的前处理模块创建了一个带孔平板模型，实现了参数化建模。(Parametrical model using Python in Abaqus.)

说明：  使用umat计算蔡吴失效准则，计算失效指数If，弹性模量和强度参数见表3.1.(Compute the Tsai-Wu failure index IF on each layer of Example 3.8 (p. 151) using a UMAT subroutine, available in umatS8R5.for. The elastic moduli and strength values for the lamina are given in Table 3.1)

说明：  abaqus umat子程序一维损伤模型 程序名umat1d83.for(The one-dimensional damage model is implemented in Abaqus using the UMAT subroutine umat1d83.for. The following items describe the procedure used to explicitly evaluate the damage constitutive equation)

说明：  ABAQUS的子程序TSAI_WU失效准则(The failure criterion of the subroutine Tsai Wu of ABAQUS)

平面应变四节点单元的UELMAT子程序，使用ABAQUS中自带的材料模型。(The UELMAT subroutine of the plane strain four node element uses the material model in the ABAQUS.)

说明：  初始裂纹第一次扩展后的新模型及inp文件(crack modeling-New model and InP file after initial crack propagation)

用abaqus有限元软件建立复合材料模型，利用fortran语言编写复合材料三维渐进损伤子程序。 ABAQUS子程序umat自定义材料本构模型的实例详细解释，帮助umat初学者掌握编程过程，进一步实现自己编程进行模拟的目的

说明：  喷丸强化有限元建模过程，是描述了整个喷丸过程用abaqus做的(Shot peening strengthening finite element modeling process is described by ABAQUS in the whole shot peening process.)

Abaqus 有限元程序 umat 代码。它使土壤剑桥的本构模型更强大 ！它可以解决一些土应变软化的问题。