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Ideal plasticity converged, both 2D and 3D

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This commit is contained in:
Olli Väinölä
2016-10-28 15:46:04 +03:00
parent b7ddc4d4c8
commit c3bc708f01
4 changed files with 144 additions and 45 deletions
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src/materials_plasticity.jl
+4 -2
View File
@@ -72,7 +72,7 @@ function radial_return(params, dstrain, D, stress_y, stress_base, yield_surface_
[vec(function_1); function_2]
end
function ideal_plasticity!(stress_new, stress_last, dstrain_vec, D, params, Dtan, yield_surface_, time, dt, type_)
function ideal_plasticity!(stress_new, stress_last, dstrain_vec, pstrain, D, params, Dtan, yield_surface_, time, dt, type_)
# Test stress
dstress = vec(D * dstrain_vec)
stress_trial = stress_last + dstress
@@ -83,6 +83,7 @@ function ideal_plasticity!(stress_new, stress_last, dstrain_vec, D, params, Dtan
# Calculating and checking for yield
yield = yield_curr(stress_trial)
if isless(yield, 0.0)
stress_new[:] = stress_trial[:]
Dtan[:,:] = D[:,:]
else
@@ -103,6 +104,7 @@ function ideal_plasticity!(stress_new, stress_last, dstrain_vec, D, params, Dtan
# Updating stress
stress_new[:] = stress_last + dstress
# Calculating plastic strain
dfds_ = x -> ForwardDiff.gradient(yield_curr, x)
dep = plastic_multiplier * dfds_(vec(stress_new))
@@ -114,6 +116,6 @@ function ideal_plasticity!(stress_new, stress_last, dstrain_vec, D, params, Dtan
Dc = (D^-1 + plastic_multiplier * D2g(stress_new))^-1
dfds = dfds_(stress_new)
Dtan[:,:] = Dc - (Dc * dfds * dfds' * Dc) / (dfds' * Dc * dfds)[1]
pstrain[:] = plastic_multiplier * dfds
end
end
src/problems_elasticity.jl
+59 -24
View File
@@ -71,7 +71,7 @@ typealias Elasticity2DVolumeElements Union{Tri3, Tri6, Quad4, Quad8, Quad9}
typealias Elasticity3DSurfaceElements Union{Poi1, Tri3, Tri6, Quad4, Quad8, Quad9}
typealias Elasticity3DVolumeElements Union{Tet4, Wedge6, Hex8, Tet10, Hex20, Hex27}
function initialize_internal_params!(params, ip, ::Type{Val{:type_2d}})
function initialize_internal_params!(params, ip, type_) #::Type{Val{:type_2d}})
param_keys = keys(params)
all_keys = ip.fields.keys
ip_fields = filter(x->isdefined(all_keys, x), collect(1:length(all_keys)))
@@ -80,8 +80,15 @@ function initialize_internal_params!(params, ip, ::Type{Val{:type_2d}})
for key in param_keys
update!(ip, key, 0.0 => params[key])
end
update!(ip, "stress", 0.0 => [0.0,0.0,0.0])
update!(ip, "strain", 0.0 => [0.0,0.0,0.0])
if type_ == Val{:type_2d}
update!(ip, "stress", 0.0 => [0.0,0.0,0.0])
update!(ip, "strain", 0.0 => [0.0,0.0,0.0])
elseif type_ == Val{:type_3d}
update!(ip, "stress", 0.0 => [0.0,0.0,0.0,0.0,0.0,0.0])
update!(ip, "strain", 0.0 => [0.0,0.0,0.0,0.0,0.0,0.0])
else
error("daa")
end
update!(ip, "prev_time", 0.0 => 0.0)
update!(ip, "params_initialized", 0.0 => true)
end
@@ -93,13 +100,13 @@ function get_keys(element)
map(x -> all_keys[x], idx)
end
function initialize_internal_params!(params, ip_id, ::Type{Val{:type_3d}})
if !(ip_id in keys(params))
params[ip_id] = Dict{Any, Any}()
params[ip_id]["last_stress"] = [0.0,0.0,0.0,0.0,0.0,0.0]
params[ip_id]["last_strain"] = [0.0,0.0,0.0,0.0,0.0,0.0]
end
end
#function initialize_internal_params!(params, ip_id, ::Type{Val{:type_3d}})
# if !(ip_id in keys(params))
# params[ip_id] = Dict{Any, Any}()
# params[ip_id]["last_stress"] = [0.0,0.0,0.0,0.0,0.0,0.0]
# params[ip_id]["last_strain"] = [0.0,0.0,0.0,0.0,0.0,0.0]
# end
#end
""" Elasticity equations for 2d cases. """
function assemble{El<:Elasticity2DVolumeElements}(problem::Problem{Elasticity}, element::Element{El}, time, ::Type{Val{:plane}})
@@ -513,21 +520,48 @@ function assemble{El<:Elasticity3DVolumeElements}(problem::Problem{Elasticity},
element_keys = get_keys(element)
if "plasticity" in element_keys
plastic_def = element.dev["plasticity"]
calculate_stress! = plastic_def["stress"]
params = plastic_def["params"]
yield_surface_ = plastic_def["yield_surface"]
(stress_last, strain_last) = get_internal_params(element.dev, ip.id, Val{:type_3d})
dstrain_vec = strain_vec - strain_last
stress_vec = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Dtan = [0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0]
calculate_stress!(stress_vec, stress_last, dstrain_vec, D, params, Dtan, yield_surface_, Val{:type_3d})
plastic_def = element("plasticity")[ip.id]
calculate_stress! = plastic_def["type"]
yield_surface_ = plastic_def["yield_surface"]
params = plastic_def["params"]
initialize_internal_params!(params, ip, Val{:type_3d})
if time == 0.0
error("Given step time = $(time). Please select time > 0.0")
end
t_last = ip("prev_time", time)
update!(ip, "prev_time", time => t_last)
dt = time - t_last
stress_last = ip("stress", t_last)
strain_last = ip("strain", t_last)
dstrain_vec = strain_vec - strain_last
stress_vec = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
plastic_strain = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Dtan = [0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0;
0.0 0.0 0.0 0.0 0.0 0.0]
calculate_stress!(stress_vec, stress_last, dstrain_vec, plastic_strain, D, params, Dtan, yield_surface_, time, dt, Val{:type_3d})
# plastic_def = element.dev["plasticity"]
# calculate_stress! = plastic_def["stress"]
# params = plastic_def["params"]
# yield_surface_ = plastic_def["yield_surface"]
# (stress_last, strain_last) = get_internal_params(element.dev, ip.id, Val{:type_3d})
# dstrain_vec = strain_vec - strain_last
# calculate_stress!(stress_vec, stress_last, dstrain_vec, D, params, Dtan, yield_surface_, Val{:type_3d})
else
stress_vec = D * ([1.0, 1.0, 1.0, 2.0, 2.0, 2.0].*strain_vec)
Dtan = D
end
@@ -540,6 +574,7 @@ function assemble{El<:Elasticity3DVolumeElements}(problem::Problem{Elasticity},
:stress12 in props.store_fields && update!(ip, "stress12", time => stress_vec[4])
:stress23 in props.store_fields && update!(ip, "stress23", time => stress_vec[5])
:stress13 in props.store_fields && update!(ip, "stress13", time => stress_vec[6])
:plastic_strain in props.store_fields && update!(ip, "plastic_strain", time => plastic_strain)
Km += w*BL'*Dtan*BL
# material stiffness end