首先是始点刚度法: SUBROUTINE UMAT(STRESS,STATEV,DDSDDE,SSE,SPD,SCD, RPL,DDSDDT,DRPLDE,DRPLDT, STRAN,DSTRAN,TIME,DTIME,TEMP,DTEMP,PREDEF,DPRED,CMNAME, NDI,NSHR,NTENS,NSTATV,PROPS,NPROPS,COORDS,DROT,PNEWDT, CELENT,DFGRD0,DFGRD1,NOEL,NPT,LAYER,KSPT,JSTEP,KINC)…