abaqus系列之接触

《abaqus系列之接触》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、接触笔记1、DefiningcontactpairsinABAQUS/StandardAftertheselectionofcontactpairsurfaces,threekeyfactorsmustbedeterminedwhencreatingacontactformulation:⑴thecontactdiscretization;⑵thetrackingapproach;and⑶theassignmentof“master”and“slave”rolestotherespectivesurface

2、s.1.1thecontactdiscretizationABAQUS/Standardofferstwocontactdiscretizationoptions:atraditional“node-to-surface”discretizationandatrue“surface-to-surface”discretization.1.1.1Node-to-surfacecontactdiscretizationTraditionalnode-to-surfacediscretizationhasthef

3、ollowingcharacteristics:⑴Theslavenodesareconstrainednottopenetrateintothemastersurface;however,thenodesofthemastersurfacecan,inprinciple,penetrateintotheslavesurface⑵Thecontactdirectionisbasedonthenormalofthemastersurface.⑶Theonlyinformationneededforthesla

4、vesurfaceisthelocationandsurfaceareaassociatedwitheachnode;Thedirectionoftheslavesurfacenormalandslavesurfacecurvaturearenotrelevant.Thus,theslavesurfacecanbedefinedasagroupofnodes—anode-basedsurface.⑷Node-to-surfacediscretizationisavailableevenifanode-bas

5、edsurfaceisnotusedinthecontactpairdefinitionFig.1Node-to-surfacecontactdiscretization1.1.2Surface-to-surfacecontactdiscretizationTooptimizestressaccuracy,surface-to-surfacediscretizationconsiderstheshapeofboththeslaveandmastersurfacesintheregionofcontactco

6、nstraints.Surface-to-surfacediscretizationhasthefollowingkeycharacteristics:⑴Contactconditionsareenforcedinanaveragesenseovertheslavesurface,ratherthanatdiscretepoints(suchasatslavenodes,asinthecaseofnode-to-surfacediscretization).Therefore,somepenetration

7、maybeobservedatindividualnodes;however,large,undetectedpenetrationsofmasternodesintotheslavesurfacedonotoccurwiththisdiscretization.⑵Surface-to-surfacediscretizationisnotapplicableifanode-basedsurfaceisusedinthecontactpairdefinition.在某一个迭代步中,面对面的接触计算成本一般较点

8、对面的接触的计算成本高,但多数情况下这个成本不会高很多,只有在下列情况下才会让计算成本急剧增大:⑴模型的绝大部分区域被包含于接触中;⑵当主动面比从属面网格划分还要精细时;⑶Multiplelayersofshellsareinvolvedincontact,suchthatthemastersurfaceofonecontactpairactsastheslavesurfaceofanothercontactpa