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DAMASK_EICMD
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simplified

This commit is contained in:
Martin Diehl 2021-06-24 16:07:54 +02:00
parent 12ca7428cf
commit f834a1534e
1 changed files with 13 additions and 19 deletions
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32
src/phase_mechanical_plastic_nonlocal.f90
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@ -1655,7 +1655,6 @@ pure subroutine kinetics(v, dv_dtau, dv_dtauNS, tau, tauNS, tauThreshold, c, T,
tauEff, & !< effective shear stress
tPeierls, & !< waiting time in front of a peierls barriers
tSolidSolution, & !< waiting time in front of a solid solution obstacle
vViscous, & !< viscous glide velocity
dtPeierls_dtau, & !< derivative with respect to resolved shear stress
dtSolidSolution_dtau, & !< derivative with respect to resolved shear stress
lambda_S, & !< mean free distance between two solid solution obstacles
@ -1664,8 +1663,7 @@ pure subroutine kinetics(v, dv_dtau, dv_dtauNS, tau, tauNS, tauThreshold, c, T,
activationVolume_S, & !< volume that needs to be activated to overcome barrier
activationEnergy_P, & !< energy that is needed to overcome barrier
criticalStress_P, & !< maximum obstacle strength
criticalStress_S, & !< maximum obstacle strength
mobility !< dislocation mobility
criticalStress_S !< maximum obstacle strength
associate(prm => param(ph))
v = 0.0_pReal
@ -1685,12 +1683,10 @@ pure subroutine kinetics(v, dv_dtau, dv_dtauNS, tau, tauNS, tauThreshold, c, T,
tPeierls = 1.0_pReal / prm%nu_a &
* exp(activationEnergy_P / (kB * T) &
* (1.0_pReal - tauRel_P**prm%p)**prm%q)
if (tauEff < criticalStress_P) then
dtPeierls_dtau = tPeierls * prm%p * prm%q * activationVolume_P / (kB * T) &
* (1.0_pReal - tauRel_P**prm%p)**(prm%q-1.0_pReal) * tauRel_P**(prm%p-1.0_pReal)
else
dtPeierls_dtau = 0.0_pReal
endif
dtPeierls_dtau = merge(tPeierls * prm%p * prm%q * activationVolume_P / (kB * T) &
* (1.0_pReal - tauRel_P**prm%p)**(prm%q-1.0_pReal) * tauRel_P**(prm%p-1.0_pReal), &
0.0_pReal, &
tauEff < criticalStress_P)
! Contribution from solid solution strengthening
tauEff = abs(tau(s)) - tauThreshold(s)
@ -1700,22 +1696,20 @@ pure subroutine kinetics(v, dv_dtau, dv_dtauNS, tau, tauNS, tauThreshold, c, T,
tauRel_S = min(1.0_pReal, tauEff / criticalStress_S)
tSolidSolution = 1.0_pReal / prm%nu_a &
* exp(prm%Q_sol / (kB * T)* (1.0_pReal - tauRel_S**prm%p)**prm%q)
if (tauEff < criticalStress_S) then
dtSolidSolution_dtau = tSolidSolution * prm%p * prm%q * activationVolume_S / (kB * T) &
* (1.0_pReal - tauRel_S**prm%p)**(prm%q-1.0_pReal)* tauRel_S**(prm%p-1.0_pReal)
else
dtSolidSolution_dtau = 0.0_pReal
endif
dtSolidSolution_dtau = merge(tSolidSolution * prm%p * prm%q * activationVolume_S / (kB * T) &
* (1.0_pReal - tauRel_S**prm%p)**(prm%q-1.0_pReal)* tauRel_S**(prm%p-1.0_pReal), &
0.0_pReal, &
tauEff < criticalStress_S)
!* viscous glide velocity
tauEff = abs(tau(s)) - tauThreshold(s)
mobility = prm%b_sl(s) / prm%eta
vViscous = mobility * tauEff
v(s) = sign(1.0_pReal,tau(s)) &
/ (tPeierls / lambda_P + tSolidSolution / lambda_S + 1.0_pReal / vViscous)
dv_dtau(s) = v(s)**2.0_pReal * (dtSolidSolution_dtau / lambda_S + mobility /vViscous**2.0_pReal)
/ (tPeierls / lambda_P + tSolidSolution / lambda_S + prm%eta /(prm%b_sl(s) * tauEff))
dv_dtau(s) = v(s)**2.0_pReal * (dtSolidSolution_dtau / lambda_S + prm%eta / (prm%b_sl(s) * tauEff**2.0_pReal))
dv_dtauNS(s) = v(s)**2.0_pReal * dtPeierls_dtau / lambda_P
endif
enddo