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1、有限元的分析与编程应用求解报告一、问题的描述如图所示三角形截面简支梁,底边中点受载荷P作用,已知P=L=E=1,μ=0,厚度h=1.按平面应力考虑。用尽可能简单的有限元法计算载荷作用点位移。二、问题的分析按平面应力考虑,作用于三角形简支梁上的载荷平行于截面且沿纵向方向分布。选择单元类型为:三结点常应变单元。一、问题的求解已知弹性模量E=1,泊松比u=0,厚度h=1。结点的选择如图所示:如上所示模型中,点1和点2为固定节点,在L1中间位置的节点4上施加p=-1的载荷。其网格分布如下图:运算后得出如下结果:Y轴方向上的应力分布图:其位移分布图:由图可得:单元类型最小位移(mm)最大位移(m
2、m)最小应力(Pa)最大应力(Pa)常应变三结点单元015.562-13.98310.891本题要求载荷作用点位移,即最大位移为:15.562一、ANSYS程序代码:/COM,Structural!*/PREP7!*ET,1,BEAM3!*!*ETDEL,1!*ET,1,PLANE42!*!*MPTEMP,,,,,,,,MPTEMP,1,0MPDATA,EX,1,,1MPDATA,PRXY,1,,0K,1,0,0,0,K,2,2,0,0,K,3,1,1,0,LSTR,1,2LSTR,2,3LSTR,3,1!*HPTCREATE,LINE,1,0,COORD,1,0,0,CM,_Y,LI
3、NELSEL,,,,1CM,_Y1,LINECMSEL,S,_Y!*!*CMSEL,S,_Y1LATT,1,,1,,,,CMSEL,S,_YCMDELE,_YCMDELE,_Y1!*CM,_Y,LINELSEL,,,,1CM,_Y1,LINECMSEL,S,_Y!*!*CMSEL,S,_Y1LATT,1,,1,,,,CMSEL,S,_YCMDELE,_YCMDELE,_Y1!*CM,_Y,LINELSEL,,,,1CM,_Y1,LINECMSEL,S,_Y!*FLST,5,1,4,ORDE,1FITEM,5,1CM,_Y,LINELSEL,,,,P51XCM,_Y1,LINECMSEL
4、,,_Y!*LESIZE,_Y1,,,20,,,,,1!*FLST,5,1,4,ORDE,1FITEM,5,3CM,_Y,LINELSEL,,,,P51XCM,_Y1,LINECMSEL,,_Y!*LESIZE,_Y1,,,20,,,,,1!*FLST,5,1,4,ORDE,1FITEM,5,2CM,_Y,LINELSEL,,,,P51XCM,_Y1,LINECMSEL,,_Y!*LESIZE,_Y1,,,20,,,,,1!*FLST,2,3,4,ORDE,2FITEM,2,1FITEM,2,-3LMESH,P51XMSHAPE,0,2DMSHKEY,0!*FLST,2,3,4,ORD
5、E,2FITEM,2,1FITEM,2,-3LMESH,P51XFLST,2,3,4FITEM,2,3FITEM,2,2FITEM,2,1AL,P51XCM,_Y,AREAASEL,,,,1CM,_Y1,AREACHKMSH,'AREA'CMSEL,S,_Y!*AMESH,_Y1!*CMDELE,_YCMDELE,_Y1CMDELE,_Y2!*FINISH/SOLFINISH/PREP7FINISH/SOLFLST,2,1,3,ORDE,1FITEM,2,4FLST,2,2,3,ORDE,2FITEM,2,1FITEM,2,-2!*/GODK,P51X,,0,,0,UX,UY,,,,,
6、FLST,2,1,3,ORDE,1FITEM,2,4!*/GOFK,P51X,FY,-1/STATUS,SOLUSOLVEFINISH/POST1!*/EFACET,1PLNSOL,S,XY,0,1.0!*PLESOL,S,XY,0,1.0