2534vumat用户子程序翻译abaqus帮助手册

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1、25.3.4 VUMAT25.3.4 VUMATUsersubroutinetodefinematerialbehavior.定义材料本构用户子程序Product:ABAQUS/Explicit  Warning: Theuseofthisusersubroutinegenerallyrequiresconsiderableexpertise.Youarecautionedthattheimplementationofanyrealisticconstitutivemodelrequiresextensivedevelopmentan

2、dtesting.Initialtestingonasingle-elementmodelwithprescribedtractionloadingisstronglyrecommended.注意：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。Thecomponentorderingofthesymmetricandnonsymmetrictensorsforthethree-dimensionalcaseusingC3D8Re

3、lementsisdifferentfromtheorderingspecifiedin“Three-dimensionalsolidelementlibrary,”Section14.1.4,andtheorderingusedinABAQUS/Standard.C3D8R单元三维轴对称及非轴对称张量成分顺序与“Three-dimensionalsolidelementlibrary,”Section14.1.4及ABAQUS/Standard中指定的顺序不同。References·“User-definedmechanicalma

4、terialbehavior,”Section12.8.1·*USERMATERIALOverviewUsersubroutineVUMAT:用户子程序VUMAT·isusedtodefinethemechanicalconstitutivebehaviorofamaterial;·用来定义材料的力学本构关系·willbecalledforblocksofmaterialcalculationpointsforwhichthematerialisdefinedinausersubroutine(“Materialdatadefinit

5、ion,”Section9.1.2);·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,”Section12.8.1;and·在“User-definedmechanicalmaterialbeh

6、avior,”Section12.8.1中详细论述；·cannotbeusedinanadiabaticanalysis.·可以被用于绝热分析Componentorderingintensors张量组成顺序Thecomponentorderingdependsuponwhetherthetensorissymmetricornonsymmetric.张量组成顺序取决于其是否为对称或非对称张量。Symmetrictensors对称张量25.3.4-15Forsymmetrictensorssuchasthestressandstrain

7、tensors,therearendir+nshrcomponents,andthecomponentorderisgivenasanaturalpermutationoftheindicesofthetensor.Thedirectcomponentsarefirstandthentheindirectcomponents,beginningwiththe12-component.Forexample,astresstensorcontainsndirdirectstresscomponentsandnshrshearstressc

8、omponents,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，包含nd