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avoid division by M gives better agreement with phenopowerlaw

This commit is contained in:
Martin Diehl 2021-06-21 23:11:09 +02:00
parent 932ee21d11
commit 27431bd60c
1 changed files with 3 additions and 3 deletions
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6
src/phase_mechanical_plastic_isotropic.f90
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@ -185,14 +185,14 @@ module subroutine isotropic_LpAndItsTangent(Lp,dLp_dMp,Mp,ph,en)
if (norm_Mp_dev > 0.0_pReal) then if (norm_Mp_dev > 0.0_pReal) then
dot_gamma = prm%dot_gamma_0 * (sqrt(1.5_pReal) * norm_Mp_dev/(prm%M*stt%xi(en))) **prm%n dot_gamma = prm%dot_gamma_0 * (sqrt(1.5_pReal) * norm_Mp_dev/(prm%M*stt%xi(en))) **prm%n
Lp = dot_gamma/prm%M * Mp_dev/norm_Mp_dev Lp = dot_gamma * Mp_dev/norm_Mp_dev
forall (k=1:3,l=1:3,m=1:3,n=1:3) & forall (k=1:3,l=1:3,m=1:3,n=1:3) &
dLp_dMp(k,l,m,n) = (prm%n-1.0_pReal) * Mp_dev(k,l)*Mp_dev(m,n) / squarenorm_Mp_dev dLp_dMp(k,l,m,n) = (prm%n-1.0_pReal) * Mp_dev(k,l)*Mp_dev(m,n) / squarenorm_Mp_dev
forall (k=1:3,l=1:3) & forall (k=1:3,l=1:3) &
dLp_dMp(k,l,k,l) = dLp_dMp(k,l,k,l) + 1.0_pReal dLp_dMp(k,l,k,l) = dLp_dMp(k,l,k,l) + 1.0_pReal
forall (k=1:3,m=1:3) & forall (k=1:3,m=1:3) &
dLp_dMp(k,k,m,m) = dLp_dMp(k,k,m,m) - 1.0_pReal/3.0_pReal dLp_dMp(k,k,m,m) = dLp_dMp(k,k,m,m) - 1.0_pReal/3.0_pReal
dLp_dMp = dot_gamma / prm%M * dLp_dMp / norm_Mp_dev dLp_dMp = dot_gamma * dLp_dMp / norm_Mp_dev
else else
Lp = 0.0_pReal Lp = 0.0_pReal
dLp_dMp = 0.0_pReal dLp_dMp = 0.0_pReal
@ -230,7 +230,7 @@ module subroutine plastic_isotropic_LiAndItsTangent(Li,dLi_dMi,Mi,ph,en)
if (prm%dilatation .and. abs(tr) > 0.0_pReal) then ! no stress or J2 plasticity --> Li and its derivative are zero if (prm%dilatation .and. abs(tr) > 0.0_pReal) then ! no stress or J2 plasticity --> Li and its derivative are zero
Li = math_I3 & Li = math_I3 &
* prm%dot_gamma_0/prm%M * (3.0_pReal*prm%M*stt%xi(en))**(-prm%n) & * prm%dot_gamma_0 * (3.0_pReal*prm%M*stt%xi(en))**(-prm%n) &
* tr * abs(tr)**(prm%n-1.0_pReal) * tr * abs(tr)**(prm%n-1.0_pReal)
forall (k=1:3,l=1:3,m=1:3,n=1:3) dLi_dMi(k,l,m,n) = prm%n / tr * Li(k,l) * math_I3(m,n) forall (k=1:3,l=1:3,m=1:3,n=1:3) dLi_dMi(k,l,m,n) = prm%n / tr * Li(k,l) * math_I3(m,n)
else else