文档介绍：  :ABAQUS/Explicit  Warning: -:用户子程序的使用通常需要一定的专长。用户需要知道执行任何实际的本构模型需要大量的试验数据。强烈建议用户对用户子程序进行在指定拉力作用下单个单元的验证测试。ponentorderingofthesymmetricandnonsymmetrictensorsforthethree-dimensionalcaseusingC3D8Relementsisdifferentfromtheorderingspecifiedin“Three-dimensionalsolidelementlibrary,”,andtheorderingusedinABAQUS/“Three-dimensionalsolidelementlibrary,”。References“User-definedmechanicalmaterialbehavior,”*USERMATERIALOverviewUsersubroutineVUMAT:hemechanicalconstitutivebehaviorofamaterial;用来定义材料的力学本构关系willbecalledforblocksofmaterialcalculationpointsforwhichthematerialisdefinedinausersubroutine(“Materialdatadefinition,”);可以被用户子程序定义材料计算点调用canuseandupdatesolution-dependentstatevariables;可以使用和更新结果依赖状态变量canuseanyfieldvariablesthatarepassedin;可以使用传入的任何场变量isdescribedfurtherin“User-definedmechanicalmaterialbehavior,”;and在“User-definedmechanicalmaterialbehavior,”;。Symmetrictensors对称张量Forsymmetrictensorssuchasthestressandstraintensors,therearendir+ponents,,,ponents,whicharepassedinas对于如同应力及应变张量等的对称张量,含有ndir+nshr分量,分量的序号按张量索引号的自然排序给出。首先是直接分量,然后是从12分量开始的间接分量。例如,ponent2-DCase3-DCase12345 6 ponents;thisisdifferentfromusersubroutineUMATinABAQUS/Standard,+2*ponents,,,thedeformationgradientispassedas对于非对称张量含有ndir+2*nshr分量,分量的顺序按照张量索引号的自然排序给出。首先是直接分量,其次是从12分量开始的间接分量。例如,ponent2-DCase3-DCase123456 