New question #652185 on Yade:
https://answers.launchpad.net/yade/+question/652185
when i give a [0,0,0] strain to the Yade, the Yade gives back a stress that is
not zero, and then give a zero strain to Yade, and Yade will give back a
different stress.
the question is when i set different young of the balls, i think the stress is
no doubt different, however, when i give a strain
like[1e-7,0,0],[0,1e-7,0],[0,0,1e-7] at the beginning of steps, the stress Yade
get is different.
part of the code is as shown below:
for b in O.bodies:
b.material.young = 1.0001*17e10
# because the send message can't reach the wanted precise
ag = [0]*3 # current - last ie. the
changed strain
ag[0] = arr[0] - arrcc[0]
ag[1] = arr[1] - arrcc[1]
ag[2] = arr[2] - arrcc[2]
check[0] = 1
ns=100
dstrain = utils.Matrix3(ag[0],ag[2],0,0,ag[1],0,0,0,0)
# the goal strain xx xy xz, yx yy yz, zx zy zz
O.cell.velGrad=dstrain/(ns*O.dt)
O.run(ns,True)
stressValue=utils.getStress()
stressxx=stressValue[0,0]
# the return stress xx
stressyy=stressValue[1,1]
# the return stress yy
stressxy=(stressValue[0,1]+stressValue[1,0])/2
# the return stress xy = (xy + yx)/2
msg=str(stressxx)+','+str(stressyy)+','+str(stressxy)
print msg
print 'transformation'
print O.cell.trsf #
the goal strain
c.send(msg)
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