关于VUSDFLD中新旧变量的提取问题?
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最近,我再将以前写的一个隐式计算的USDFLS的子程序改写为VUSDFLD,结果遇到的问题
我使用vusdfld在实现单元的删除,在里面计算等效塑性应变的增量的时候,我令一个变量等于stateOld,然后用stateNew减去这个值来实现我的目的,为什么不行?也就是stateOld里面并不是存的上一步的等效塑性应变的结果?
这个问题困扰我很久了,能否有大神助一臂之力的?
附上子程序和inp文件,以及odb的结果
c c User subroutine VUSDFLD for user-defined fields c subroutine vusdfld( c Read only - * nblock, nstatev, nfieldv, nprops, ndir, nshr, * jElemUid, kIntPt, kLayer, kSecPt, * stepTime, totalTime, dt, cmname, * coordMp, direct, T, charLength, props, * stateOld, c Write only - * stateNew, field ) c include 'vaba_param.inc' c dimension props(nprops), * jElemUid(nblock), coordMp(nblock, *), * direct(nblock, 3, 3), T(nblock,3,3), * charLength(nblock), * stateOld(nblock, nstatev), * stateNew(nblock, nstatev), * field(nblock, nfieldv) character*80 cmname parameter( nrData=6 ) character*3 cData(maxblk*6) dimension jData(maxblk*nrData) dimension eqps(nblock,maxblk*6),stress(nblock,maxblk*6) real dc,rc,plim,alpha,beta,eqpsOld,damageOld c parameter ( zero = 0.d0 ) C 定义损伤的极限值 parameter ( one = 1.d0 ) C 通过vgetvrm函数来获取等效塑性应变和应力分量 jStatus = 1 call vgetvrm( 'PEEQ', eqps, jData, cData, jStatus ) call vgetvrm( 'S', stress, jData, cData, jStatus ) C 循环进行进行求解响应的变量 do k = 1, nblock damageOld = stateOld(k,10) c-----------------------------------------------------------------------c C 主要是计算应力三轴度 C 首相将提取的应力分量赋给状态变量/变量,用来计算mises应力和静水压力 C stateNew(k,51) = stress(k,1) stress1 = stress(k,1) C stateNew(k,52) = stress(k,2) stress2 = stress(k,2) C stateNew(k,53) = stress(k,3) stress3 = stress(k,3) C stateNew(k,54) = stress(k,4) stress4 = stress(k,4) C stateNew(k,55) = stress(k,5) stress5 = stress(k,5) C stateNew(k,56) = stress(k,6) stress6 = stress(k,6) C 计算mises应力和静水压力 smises1 = (stress1-stress2)**2+(stress2-stress3)**2+(stress1-stress3)**2 smises = (0.5*smises1)**0.5 hpress = (stress1+stress2+stress3)/3.0 C 将计算的mises应力和静水压力赋给状态变量 stateNew(k,1) = smises stateNew(k,2) = hpress C 计算应力三轴度,并将其赋给状态变量 if(smises.le.stoler) then triax=0.d0 else triax=(1.0*hpress)/smises endif stateNew(k,3) = triax c-----------------------------------------------------------------------c C 主要是计算断裂应变 c 根据确定的系数和计算的应力三轴度,计算临界断裂应变,并将其赋给状态变量 frac_strain = 1.556*exp(-1.5*triax)+0.093 stateNew(k,4) = frac_strain c-----------------------------------------------------------------------c C 主要是计算损伤增量 C 上一步的等效塑性应变stateNew(k,5),该步的等效塑性应变stateNew(k,6),增量stateNew(k,7) C if(stepTime.eq.zero) then C stateNew(k,5) = 0.0 C stateNew(k,6) = 0.0 C else stateNew(k,5) = stateOld(k,6) C endif stateNew(k,6) = eqps(k,1) stateNew(k,7) = stateNew(k,6)-stateNew(k,5) C 该步的损伤增量 stateNew(k,8) = stateNew(k,7)/stateNew(k,4) c-----------------------------------------------------------------------c C 初始的损伤量 C if(stepTime.eq.zero) then C stateNew(k,9) = 0.0 C stateNew(k,10) = 0.0 C else stateNew(k,9) = damageOld C endif C 该步的损伤增量 stateNew(k,10) = stateNew(k,9) + stateNew(k,8) stateOld(k,10) = stateNew(k,10) c-----------------------------------------------------------------------c C 根据损伤量的大小来对网格进行删除 if(stateNew(k,10).gt.one) then c Element Deletion stateNew(k,11) = zero endif end do c return end
do k = 1, nblock
damageOld = stateOld(k,10)
c-----------------------------------
这句实在不解,为何要做循环
2.stateold用来承上启下,最后你要更显这个值啊,要不你怎么传递给下一个载荷步