From f3bd920c23055f5fcbdd80d4075e547e21879236 Mon Sep 17 00:00:00 2001 From: Pratheek Shanthraj Date: Mon, 21 Jan 2013 23:50:28 +0000 Subject: [PATCH] added non-schmid structure --- code/constitutive_nonlocal.f90 | 58 ++++++++++++++++++++++++++-------- 1 file changed, 44 insertions(+), 14 deletions(-) diff --git a/code/constitutive_nonlocal.f90 b/code/constitutive_nonlocal.f90 index d185c3bdd..31c07292c 100644 --- a/code/constitutive_nonlocal.f90 +++ b/code/constitutive_nonlocal.f90 @@ -172,6 +172,9 @@ constitutive_nonlocal_rhoDotThermalAnnihilation real(pReal), dimension(:,:,:,:,:,:), allocatable, private :: & constitutive_nonlocal_compatibility ! slip system compatibility between me and my neighbors +real(pReal), dimension(:,:), allocatable, private :: & +constitutive_nonlocal_nonSchmidCoeff + logical, dimension(:), allocatable, private :: & constitutive_nonlocal_shortRangeStressCorrection, & ! flag indicating the use of the short range stress correction by a excess density gradient term constitutive_nonlocal_deadZoneScaling, & @@ -234,7 +237,8 @@ use lattice, only: lattice_maxNslipFamily, & lattice_sd, & lattice_sn, & lattice_st, & - lattice_interactionSlipSlip + lattice_interactionSlipSlip, & + lattice_maxNonSchmid !*** output variables @@ -398,6 +402,9 @@ allocate(constitutive_nonlocal_peierlsStressPerSlipFamily(lattice_maxNslipFamily constitutive_nonlocal_minimumDipoleHeightPerSlipFamily = -1.0_pReal constitutive_nonlocal_peierlsStressPerSlipFamily = 0.0_pReal +allocate(constitutive_nonlocal_nonSchmidCoeff(lattice_maxNonSchmid,maxNinstance)) +constitutive_nonlocal_nonSchmidCoeff = 0.0_pReal + !*** readout data from material.config file rewind(myFile) @@ -542,6 +549,9 @@ do constitutive_nonlocal_fEdgeMultiplication(i) = IO_floatValue(line,positions,2_pInt) case('shortrangestresscorrection') constitutive_nonlocal_shortRangeStressCorrection(i) = IO_floatValue(line,positions,2_pInt) > 0.0_pReal + case ('nonschmid_coefficients') + forall (f = 1_pInt:lattice_maxNonSchmid) & + constitutive_nonlocal_nonSchmidCoeff(f,i) = IO_floatValue(line,positions,1_pInt+f) case('deadzonescaling','deadzone','deadscaling') constitutive_nonlocal_deadZoneScaling(i) = IO_floatValue(line,positions,2_pInt) > 0.0_pReal case('probabilisticmultiplication','randomsources','randommultiplication','discretesources') @@ -1475,7 +1485,7 @@ real(pReal), dimension(constitutive_nonlocal_totalNslip(phase_plasticityInstance !*** local variables integer(pInt) instance, & ! current instance of this plasticity ns, & ! short notation for the total number of active slip systems - s ! index of my current slip system + s, t ! index of my current slip system real(pReal), dimension(constitutive_nonlocal_totalNslip(phase_plasticityInstance(material_phase(g,ip,el)))) :: & tauThreshold, & ! threshold shear stress tauEff ! effective shear stress @@ -1631,7 +1641,8 @@ use prec, only: pReal, & pInt, & p_vec use math, only: math_Plain3333to99, & - math_mul6x6 + math_mul6x6, & + math_Mandel6to33 use debug, only: debug_level, & debug_constitutive, & debug_levelBasic, & @@ -1644,7 +1655,8 @@ use material, only: homogenization_maxNgrains, & material_phase, & phase_plasticityInstance use lattice, only: lattice_Sslip, & - lattice_Sslip_v + lattice_Sslip_v, & + NnonSchmid use mesh, only: mesh_ipVolume implicit none @@ -1676,15 +1688,16 @@ integer(pInt) myInstance, & ! curren s, & ! index of my current slip system sLattice ! index of my current slip system according to lattice order real(pReal), dimension(3,3,3,3) :: dLp_dTstar3333 ! derivative of Lp with respect to Tstar (3x3x3x3 matrix) +real(pReal), dimension(3,3,2) :: nonSchmid_tensor real(pReal), dimension(constitutive_nonlocal_totalNslip(phase_plasticityInstance(material_phase(g,ip,el))),8) :: & rhoSgl ! single dislocation densities (including used) real(pReal), dimension(constitutive_nonlocal_totalNslip(phase_plasticityInstance(material_phase(g,ip,el))),4) :: & v, & ! velocity + tau, & ! resolved shear stress including non Schmid and backstress terms + dgdot_dtau, & ! derivative of the shear rate with respect to the shear stress dv_dtau ! velocity derivative with respect to the shear stress real(pReal), dimension(constitutive_nonlocal_totalNslip(phase_plasticityInstance(material_phase(g,ip,el)))) :: & - tau, & ! resolved shear stress including non Schmid and backstress terms gdotTotal, & ! shear rate - dgdotTotal_dtau, & ! derivative of the shear rate with respect to the shear stress tauBack, & ! back stress from dislocation gradients on same slip system deadZoneSize @@ -1714,15 +1727,28 @@ where (abs(rhoSgl) * mesh_ipVolume(ip,el) ** 0.667_pReal < constitutive_nonlocal !*** get effective resolved shear stress do s = 1_pInt,ns - tau(s) = math_mul6x6(Tstar_v, lattice_Sslip_v(:,1,constitutive_nonlocal_slipSystemLattice(s,myInstance),myStructure)) & + tau(s,1:4) = math_mul6x6(Tstar_v, lattice_Sslip_v(:,1,constitutive_nonlocal_slipSystemLattice(s,myInstance),myStructure)) & + tauBack(s) +!*** adding non schmid contributions to ONLY screw components if present (i.e. if NnonSchmid(myStructure) > 0) + nonSchmid_tensor(1:3,1:3,1) = math_Mandel6to33(lattice_Sslip_v(:,1,constitutive_nonlocal_slipSystemLattice(s,myInstance),myStructure)) + nonSchmid_tensor(1:3,1:3,2) = nonSchmid_tensor(1:3,1:3,1) + do k = 1_pInt, NnonSchmid(myStructure) + tau(s,3) = tau(s,3) + constitutive_nonlocal_nonSchmidCoeff(k,myInstance)* & + math_mul6x6(Tstar_v, lattice_Sslip_v(:,2*k,constitutive_nonlocal_slipSystemLattice(s,myInstance),myStructure)) + tau(s,4) = tau(s,4) + constitutive_nonlocal_nonSchmidCoeff(k,myInstance)* & + math_mul6x6(Tstar_v, lattice_Sslip_v(:,2*k+1,constitutive_nonlocal_slipSystemLattice(s,myInstance),myStructure)) + nonSchmid_tensor(1:3,1:3,1) = nonSchmid_tensor(1:3,1:3,1) + constitutive_nonlocal_nonSchmidCoeff(k,myInstance)*& + math_Mandel6to33(lattice_Sslip_v(:,2*k,constitutive_nonlocal_slipSystemLattice(s,myInstance),myStructure)) + nonSchmid_tensor(1:3,1:3,2) = nonSchmid_tensor(1:3,1:3,2) + constitutive_nonlocal_nonSchmidCoeff(k,myInstance)*& + math_Mandel6to33(lattice_Sslip_v(:,2*k+1,constitutive_nonlocal_slipSystemLattice(s,myInstance),myStructure)) + enddo enddo !*** get dislocation velocity and its tangent and store the velocity in the state array -if (myStructure == 1_pInt) then ! for fcc all velcities are equal - call constitutive_nonlocal_kinetics(v(1:ns,1), tau, 1_pInt, Temperature, state, g, ip, el, dv_dtau(1:ns,1)) +if (myStructure == 1_pInt .and. NnonSchmid(myStructure) == 0_pInt) then ! for fcc all velcities are equal + call constitutive_nonlocal_kinetics(v(1:ns,1), tau(1:ns,1), 1_pInt, Temperature, state, g, ip, el, dv_dtau(1:ns,1)) do t = 1_pInt,4_pInt v(1:ns,t) = v(1:ns,1) dv_dtau(1:ns,t) = dv_dtau(1:ns,1) @@ -1731,7 +1757,7 @@ if (myStructure == 1_pInt) then ! for fcc all velcities are equal else ! for all other lattice structures the velcities may vary with character and sign do t = 1_pInt,4_pInt c = (t-1_pInt)/2_pInt+1_pInt - call constitutive_nonlocal_kinetics(v(1:ns,t), tau, c, Temperature, state, g, ip, el, dv_dtau(1:ns,t)) + call constitutive_nonlocal_kinetics(v(1:ns,t), tau(1:ns,t), c, Temperature, state, g, ip, el, dv_dtau(1:ns,t)) state%p((12+t)*ns+1:(13+t)*ns) = v(1:ns,t) enddo endif @@ -1751,8 +1777,9 @@ if (constitutive_nonlocal_deadZoneScaling(myInstance)) then deadZoneSize(s) = maxval(abs(rhoSgl(s,5:8)) / (rhoSgl(s,1:4) + abs(rhoSgl(s,5:8)))) endif gdotTotal = sum(rhoSgl(1:ns,1:4) * v, 2) * constitutive_nonlocal_burgers(1:ns,myInstance) * (1.0_pReal - deadZoneSize) -dgdotTotal_dtau = sum(rhoSgl(1:ns,1:4) * dv_dtau, 2) * constitutive_nonlocal_burgers(1:ns,myInstance) * (1.0_pReal - deadZoneSize) - +do t = 1_pInt,4_pInt + dgdot_dtau(:,t) = rhoSgl(1:ns,t) * dv_dtau(1:ns,t) * constitutive_nonlocal_burgers(1:ns,myInstance) * (1.0_pReal - deadZoneSize) +enddo !*** Calculation of Lp and its tangent @@ -1760,8 +1787,11 @@ do s = 1_pInt,ns sLattice = constitutive_nonlocal_slipSystemLattice(s,myInstance) Lp = Lp + gdotTotal(s) * lattice_Sslip(1:3,1:3,sLattice,myStructure) forall (i=1_pInt:3_pInt,j=1_pInt:3_pInt,k=1_pInt:3_pInt,l=1_pInt:3_pInt) & - dLp_dTstar3333(i,j,k,l) = dLp_dTstar3333(i,j,k,l) + dgdotTotal_dtau(s) * lattice_Sslip(i,j, sLattice,myStructure) & - * lattice_Sslip(k,l, sLattice,myStructure) + dLp_dTstar3333(i,j,k,l) = dLp_dTstar3333(i,j,k,l) + & + dgdot_dtau(s,1)*lattice_Sslip(i,j,sLattice,myStructure)*lattice_Sslip(k,l,sLattice,myStructure) +& + dgdot_dtau(s,2)*lattice_Sslip(i,j,sLattice,myStructure)*lattice_Sslip(k,l,sLattice,myStructure) +& + dgdot_dtau(s,3)*lattice_Sslip(i,j,sLattice,myStructure)*nonSchmid_tensor(k,l,1) +& + dgdot_dtau(s,4)*lattice_Sslip(i,j,sLattice,myStructure)*nonSchmid_tensor(k,l,2) enddo dLp_dTstar99 = math_Plain3333to99(dLp_dTstar3333)