ABAQUS子程序UMAT的应用资料讲解.doc

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1、__________________________________________________目录____________________________________________________________________________________________________摘要ABAQUS软件功能强大，特别是能够模拟复杂的非线性问题，它包括了多种材料本构关系及失效准则模型，并具有良好的开放性，提供了若干个用户子程序接口，允许用户以代码的形式来扩展主程序的功能。本文主要研究了ABAQUS用户子程序UMA

2、T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。本文紧紧围绕UMAT的二次开发技术，首先对其接口原理做了详细介绍，然后针对非线性有限元增量理论中的常刚度法和切线刚度法的算法理论做了深入的剖析，推导出了常刚度法和切线刚度法的算法理论的具体表达式，然后分别编制了两种算法的UMAT程序，最后建立了一个具体的验算模型，通过与ABAQUS自带弹塑性本构关系的计算结果相比较，验证两者的正确性。本文还对常刚度法和切线刚度法得算法效率做了对比，得出了在非线性程度较高时切线刚度法效

3、率高于常刚度法的结论。关键字：ABAQUS、UMAT、有限元、材料非线性、FORTRAN、切线刚度____________________________________________________________________________________________________ABSTRACTABAQUSsoftwarepowerful,especiallytosimulatecomplexnon-linearproblem,whichincludesawiderangeofmaterialconstituti

4、vemodelandfailurecriteria,andhasagoodopen,providinganumberofusersubroutineinterfacethatallowsuserstocodeformtoexpandthefunctionsofthemainprogram.ThispaperstudiestheusersubroutineUMATofABAQUSdevelopmentmethods,theuseofFORTRANlanguageisotropichardeningmaterialmodelofthe

5、interfaceprogram,studiedtheeffectsofsuchmaterialisextremelyelastic-plasticconstitutiverelationmethod.ThisarticleUMATtightlyaroundthesecondarydevelopmentoftechnology,thefirstprincipleofitsinterfacedetail,andthenforthetheoryofnonlinearfiniteelementincrementalstiffnessof

6、theregulartangentstiffnessmethodandthetheoryofalgorithmstodoanin-depthanalysisofdeducedaregulartangentstiffnessandrigidityofthelawofthespecificexpressionofalgorithmtheory,andthenthepreparationofthetwoalgorithms,respectively,oftheUMATprogram,andfinallytheestablishmento

7、faspecificmodelchecking,bringingwithABAQUSelasto-plasticconstitutiverelationofthecalculatedresultscomparedtoverifythecorrectnessofthetwo.Thisarticlealsooftenstiffnessandtangentstiffnessmethodwastodoacomparisonofalgorithmefficiencyisobtainedwhenahigherdegreeinthenon-li

8、neartangentstiffnessmethodmoreefficientthantheconclusionsoflawoftenstiffness.KEYWORDS：ABAQUS、UMAT、Finiteelement、Materialnonl