ABAQUS初学者用户子程序小例子.pdf-资料库

实例：最简单的杆件单轴拉伸，材料本构模型采用线弹性模型， E＝206000MPa, ν=0.3。左端约束，右端施加均布力 q=1。 Author: xueweek 希望这个小例子能帮助初学者减少一两天的摸索时间 1 材料本构模型：σ=Eε 在 Property 中定义材料时，在 General 下选中 User Material，输入 206000，0.3。以上两个数值代表 E、ν，在用户子程序中代表着 PROPS(1)、PROPS(2)。然后在 General 下选中 Depvar，由于该例子中没有使用状态变量，因此在第一项中输入大于 0 的数值即可。

建模大家都会，故省略 2 ABAQUS 调用用户子程序大家在论坛上也可以看到很多方法，我这里指介绍最简单的一种。在 Job Manager 中点击 Edit 选项，在 General 选项的最后一项中选择自己建立好的用户子程序文件。（注：用户子程序文件可以使用文本编辑器进行编辑，当然也可以用 Fortran 编译器，如果对自己的用户子程序文件的语法不放心，可以先用 Fortan 编译器进行编译，不过编译前要先建立 Project，关于 Fortran 编译，这里不再介绍）。完成后，点击 submit 即可进行分析。以下两张图分布是用户子程序和 ABAQUS 自带的材料模型得到的应力云图，可以看出两种图形完全相同。 3 结果

4 UMAT 子程序对于初学者来说，需要注意的是，FORTRAN 对于程序语言格式上的要求。例如，对于 FORTRAN 语言，前六个字符必须空出来，等等。检查语法最好的方法就是在 FORTRAN 编译器上进行编译。 SUBROUTINE UMAT(STRESS,STATEV,DDSDDE,SSE,SPD,SCD,RPL,DDSDDT, 1 DRPLDE,DRPLDT,STRAN,DSTRAN,TIME,DTIME,TEMP,DTEMP,PREDEF,DPRED, 2 CMNAME,NDI,NSHR,NTENS,NSTATV,PROPS,NPROPS,COORDS,DROT, 3 PNEWDT,CELENT,DFGRD0,DFGRD1,NOEL,NPT,LAYER,KSPT,KSTEP,KINC) include 'aba_param.inc' CHARACTER*8 CMNAME DIMENSION STRESS(NTENS),STATEV(NSTATV),DDSDDE(NTENS,NTENS), 1 DDSDDT(NTENS),DRPLDE(NTENS),STRAN(NTENS),DSTRAN(NTENS), 2 TIME(2),PREDEF(1),DPRED(1),PROPS(NPROPS),COORDS(3),DROT(3,3), 3 DFGRD0(3,3),DFGRD1(3,3) C UMAT FOR ISOTROPIC ELASTICITY C CANNOT BE USED FOR PLANE STRESS C ---------------------------------------------------------------- C PROPS(1) - E C PROPS(2) - NU C ----------------------------------------------------------------

C IF (NDI.NE.3) THEN WRITE (6,*) 'THIS UMAT MAY ONLY BE USED FOR ELEMENTS 1 WITH THREE DIRECT STRESS COMPONENTS' CALL XIT ENDIF C C ELASTIC PROPERTIES EMOD=PROPS(1) ENU=PROPS(2) EBULK3=EMOD/(1-2*ENU) EG2=EMOD/(1+ENU) EG=EG2/2 EG3=3*EG ELAM=(EBULK3-EG2)/3 C C ELASTIC STIFFNESS C DO K1=1, NDI DO K2=1, NDI DDSDDE(K2, K1)=ELAM END DO DDSDDE(K1, K1)=EG2+ELAM END DO DO K1=NDI+1, NTENS DDSDDE(K1 ,K1)=EG END DO C C CALCULATE STRESS C DO K1=1, NTENS DO K2=1, NTENS STRESS(K2)=STRESS(K2)+DDSDDE(K2, K1)*DSTRAN(K1) END DO END DO C RETURN END 5 *Heading ** Job name: Job-1 Model name: Model-1 ** Generated by: Abaqus/CAE 6.10-1 *Preprint, echo=NO, model=NO, history=NO, contact=NO ** ** PARTS ** *Part, name=Part-1 *End Part ** INP 输入文件

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