mirror of
https://github.com/JuliaFEM/JuliaFEM.jl.git
synced 2026-08-06 04:21:33 +00:00
Jukka Aho
dce7472cda
`Analysis` is basically doing same than `Solver` before, but has a slighly simpler structure and is more general.
94 lines
3.6 KiB
Julia
94 lines
3.6 KiB
Julia
# This file is a part of JuliaFEM.
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# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
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using JuliaFEM
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using JuliaFEM.Preprocess
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using JuliaFEM.Postprocess
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using JuliaFEM.Testing
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datadir = first(splitext(basename(@__FILE__)))
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function get_model()
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meshfile = joinpath(datadir, "block_2d.med")
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mesh = aster_read_mesh(meshfile)
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#error("mesh has $(length(mesh.nodes)) nodes")
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upper = Problem(mesh, Elasticity, "UPPER", 2)
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lower = Problem(mesh, Elasticity, "LOWER", 2)
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for body in [upper, lower]
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body.properties.formulation = :plane_stress
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update!(body, "youngs modulus", 288.0)
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update!(body, "poissons ratio", 1/3)
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end
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load = Problem(mesh, Elasticity, "UPPER_TOP", 2)
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load.properties.formulation = :plane_stress
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update!(load, "displacement traction force 2", 0.0 => 0.0)
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update!(load, "displacement traction force 2", 1.0 => -28.8)
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bc1 = Problem(mesh, Dirichlet, "LOWER_BOTTOM", 2, "displacement")
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update!(bc1, "displacement 2", 0.0)
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bc2 = Problem(mesh, Dirichlet, "LOWER_LEFT", 2, "displacement")
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update!(bc2, "displacement 1", 0.0)
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bc3 = Problem(mesh, Dirichlet, "UPPER_LEFT", 2, "displacement")
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update!(bc3, "displacement 1", 0.0)
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interface = Problem(Contact, "interface", 2, "displacement")
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interface_slave_elements = create_elements(mesh, "LOWER_TOP")
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interface_master_elements = create_elements(mesh, "UPPER_BOTTOM")
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update!(interface_slave_elements, "master elements", interface_master_elements)
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interface.elements = [interface_master_elements; interface_slave_elements]
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interface.properties.rotate_normals = true
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# in LOWER_LEFT we have node belonging also to contact interface
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# let's remove it from dirichlet bc
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create_node_set_from_element_set!(mesh, "LOWER_LEFT")
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nid = find_nearest_node(mesh, [0.0, 0.5]; node_set="LOWER_LEFT")
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coords = mesh.nodes[nid]
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info("nearest node to (0.0, 0.5) = $nid, coordinates = $coords")
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dofs = [2*(nid-1)+1, 2*(nid-1)+2]
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info("removing nid $nid, dofs $dofs from LOWER_LEFT")
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push!(bc2.assembly.removed_dofs, dofs...)
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solver = Solver(Nonlinear)
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push!(solver, upper, lower, load, bc1, bc2, bc3, interface)
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return solver
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end
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@testset "finite sliding 2d patch test, linear Seg2 elements, standard basis" begin
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solver = get_model()
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interface = solver["interface"]
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interface.assembly.u = zeros(48)
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interface.assembly.la = zeros(48)
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upper = solver["UPPER"]
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lower = solver["LOWER"]
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for body in [upper, lower]
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body.properties.geometric_stiffness = true
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body.properties.finite_strain = true
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end
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interface.properties.finite_sliding = true
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interface.properties.use_forwarddiff = true
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for time in [0.0, 1/3, 2/3, 1.0]
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interface.properties.iteration = 1
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solve!(solver, time)
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end
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node_ids, displacement = get_nodal_vector(interface.elements, "displacement", 1.0)
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node_ids, geometry = get_nodal_vector(interface.elements, "geometry", 1.0)
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node_ids, la = get_nodal_vector(get_slave_elements(interface), "lambda", 1.0)
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u2 = [u[2] for u in displacement]
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f2 = [f[2] for f in la]
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maxabsu2 = maximum(abs.(u2))
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stdabsu2 = std(abs.(u2))
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info("max(abs(u2)) = $maxabsu2, std(abs(u2)) = $stdabsu2")
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@test isapprox(stdabsu2, 0.0; atol=1.0e-12)
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maxabsf2 = maximum(abs.(f2))
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stdabsf2 = std(abs.(f2))
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info("max(abs(f2)) = $maxabsf2, std(abs(f2)) = $stdabsf2")
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@test isapprox(stdabsf2, 0.0; atol=1.0e-12)
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# for linear case pressure 28.8
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@test isapprox(mean(abs.(f2)), 27.76616800689944; rtol=1.0e-3)
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end
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