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corrected constitutive law for j2-plasticity, a factor of sqrt(1.5) was missing in the calculation of Lp, dLp/dT and dotState

This commit is contained in:
Christoph Kords 2009-05-05 14:51:02 +00:00
parent d052a69574
commit 4c2eecf280
1 changed files with 5 additions and 5 deletions
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10
trunk/constitutive_j2.f90
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@ -293,12 +293,12 @@ subroutine constitutive_j2_LpAndItsTangent(Lp,dLp_dTstar,Tstar_v,Temperature,sta
!* for Tstar==0 both Lp and dLp_dTstar are zero (if not n==1) !* for Tstar==0 both Lp and dLp_dTstar are zero (if not n==1)
if (norm_Tstar > 0) then if (norm_Tstar > 0) then
!* Calculation of Lp !* Calculation of Lp
Lp = Tstar33/norm_Tstar*constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* & Lp = dsqrt(1.5_pReal)*Tstar33/norm_Tstar*constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* &
(dsqrt(1.5_pReal)/constitutive_j2_fTaylor(matID)*norm_Tstar/state(ipc,ip,el)%p(1))**constitutive_j2_n(matID) (dsqrt(1.5_pReal)/constitutive_j2_fTaylor(matID)*norm_Tstar/state(ipc,ip,el)%p(1))**constitutive_j2_n(matID)
!* Calculation of the tangent of Lp !* Calculation of the tangent of Lp
factor = constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* & factor = dsqrt(1.5_pReal)*constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* &
(dsqrt(1.5_pReal)/ constitutive_j2_fTaylor(matID)/state(ipc,ip,el)%p(1))**constitutive_j2_n(matID) * & (dsqrt(1.5_pReal)/constitutive_j2_fTaylor(matID)/state(ipc,ip,el)%p(1))**constitutive_j2_n(matID) * &
norm_Tstar**(constitutive_j2_n(matID)-1.0_pReal) norm_Tstar**(constitutive_j2_n(matID)-1.0_pReal)
dLp_dTstar3333 = 0.0_pReal dLp_dTstar3333 = 0.0_pReal
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) &
@ -343,7 +343,7 @@ function constitutive_j2_dotState(Tstar_v,Temperature,state,ipc,ip,el)
matID = phase_constitutionInstance(material_phase(ipc,ip,el)) matID = phase_constitutionInstance(material_phase(ipc,ip,el))
norm_Tstar = dsqrt(math_mul6x6(Tstar_v,Tstar_v)) norm_Tstar = dsqrt(math_mul6x6(Tstar_v,Tstar_v))
constitutive_j2_dotState = constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* & constitutive_j2_dotState = dsqrt(1.5_pReal)*constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* &
(dsqrt(1.5_pReal)/constitutive_j2_fTaylor(matID)*norm_Tstar/state(ipc,ip,el)%p(1))** & (dsqrt(1.5_pReal)/constitutive_j2_fTaylor(matID)*norm_Tstar/state(ipc,ip,el)%p(1))** &
constitutive_j2_n(matID) * & constitutive_j2_n(matID) * &
constitutive_j2_h0(matID)*(1.0_pReal-state(ipc,ip,el)%p(1)/constitutive_j2_s_sat(matID))** & constitutive_j2_h0(matID)*(1.0_pReal-state(ipc,ip,el)%p(1)/constitutive_j2_s_sat(matID))** &
@ -392,7 +392,7 @@ pure function constitutive_j2_postResults(Tstar_v,Temperature,dt,state,ipc,ip,el
constitutive_j2_postResults(c+1) = state(ipc,ip,el)%p(1) constitutive_j2_postResults(c+1) = state(ipc,ip,el)%p(1)
c = c + 1 c = c + 1
case ('strainrate') case ('strainrate')
constitutive_j2_postResults(c+1) = constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* & constitutive_j2_postResults(c+1) = dsqrt(1.5_pReal)*constitutive_j2_gdot0(matID)/constitutive_j2_fTaylor(matID)* &
(dsqrt(1.5_pReal)/constitutive_j2_fTaylor(matID)*norm_Tstar/state(ipc,ip,el)%p(1))** & (dsqrt(1.5_pReal)/constitutive_j2_fTaylor(matID)*norm_Tstar/state(ipc,ip,el)%p(1))** &
constitutive_j2_n(matID) constitutive_j2_n(matID)
c = c + 1 c = c + 1