mirror of
https://github.com/JuliaFEM/JuliaFEM.jl.git
synced 2026-09-16 16:53:19 +00:00
Jukka Aho
b3f0531746
* refactored code for solvers. * Added elementary tests for least-squares fitting of strain and stress fields * A more realistic postprocess + Xdmf writing test * removed debug keyword argument from test * Rewrite update_xdmf! New function to update Xdmf file no longer takes Solver object but xdmf, problem, time and fields to write, for example julia> update_xdmf!(xdmf, problem, 0.0, ["displacement", "temperature"]) All problems are written separately and put together into one SpatialCollection, allowing to have more structured Xdmf and making it easier to write complicated field configurations. Support for Xdmf API 3.0 added. * Support for Tensor6 field writing * moved update_xdmf! to io.jl * Removed some empty files * Not use old Postprocessor, obsolete code. * Not use old XDMF (obsolete code). Fixed test. * removed some postprocessing to pass test, maybe we should drop abaqus.jl from code as obsolete * add function get_temporal_collection back, it's used by update_xdmf of modal solver * postprocess of boundary problems also * added test for contact pressure. dl+quad test output was written in wrong file, fixed. * postprocess for contact pressure * contact pressure postprocess * with boundary problems always store also the primary unknown field * Change "reaction force" -> "lambda" * testing postprocess of reaction force also * sign convention
95 lines
4.0 KiB
Julia
95 lines
4.0 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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using JuliaFEM.Abaqus: create_surface_elements
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datadir = first(splitext(basename(@__FILE__)))
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@testset "test postprocessing of secondary fields" begin
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mesh = abaqus_read_mesh(joinpath(datadir, "tet4.inp"))
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upper = Problem(Elasticity, "UPPER", 3)
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upper.elements = create_elements(mesh, "UPPER")
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update!(upper, "youngs modulus", 3*288.0)
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update!(upper, "poissons ratio", 1/3)
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push!(upper.postprocess_fields, "strain", "stress")
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info("upper postprocess: $(upper.postprocess_fields)")
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lower = Problem(Elasticity, "LOWER", 3)
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lower.elements = create_elements(mesh, "LOWER")
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update!(lower, "youngs modulus", 288.0)
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update!(lower, "poissons ratio", 1/3)
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push!(lower.postprocess_fields, "strain", "stress")
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info("lower postprocess: $(lower.postprocess_fields)")
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bc_upper = Problem(Dirichlet, "UPPER_TOP", 3, "displacement")
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bc_upper.elements = create_surface_elements(mesh, "UPPER_TOP")
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update!(bc_upper, "displacement 3", -0.4)
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bc_lower = Problem(Dirichlet, "LOWER_BOTTOM", 3, "displacement")
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bc_lower.elements = create_surface_elements(mesh, "LOWER_BOTTOM")
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update!(bc_lower, "displacement 3", 0.0)
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# point-wise boundary conditions to prevent free body move
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nid1 = find_nearest_nodes(mesh, [0.0, 0.0, 0.0])[1]
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nid2 = find_nearest_nodes(mesh, [1.0, 0.0, 0.0])[1]
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nid3 = find_nearest_nodes(mesh, [0.0, 1.0, 0.0])[1]
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nid4 = find_nearest_nodes(mesh, [0.0, 0.0, 1.0])[1]
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nid5 = find_nearest_nodes(mesh, [1.0, 0.0, 1.0])[1]
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nid6 = find_nearest_nodes(mesh, [0.0, 1.0, 1.0])[1]
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bc_sym13 = Problem(Dirichlet, "SYM13", 3, "displacement")
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# nodes in X2=0 plane
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bc_sym13.elements = [Element(Poi1, [j]) for j in [nid1, nid2, nid4, nid5]]
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update!(bc_sym13, "geometry", mesh.nodes)
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update!(bc_sym13, "displacement 2", 0.0)
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bc_sym23 = Problem(Dirichlet, "SYM23", 3, "displacement")
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# nodes in X1=0 plane
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bc_sym23.elements = [Element(Poi1, [j]) for j in [nid1, nid3, nid4, nid6]]
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update!(bc_sym23, "geometry", mesh.nodes)
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update!(bc_sym23, "displacement 1", 0.0)
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for bc in [bc_upper, bc_lower, bc_sym13, bc_sym23]
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push!(bc.postprocess_fields, "reaction force")
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end
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interface = Problem(Contact, "LOWER_TO_UPPER", 3, "displacement")
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interface_slave_elements = create_surface_elements(mesh, "LOWER_TO_UPPER")
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interface_master_elements = create_surface_elements(mesh, "UPPER_TO_LOWER")
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update!(interface_slave_elements, "master elements", interface_master_elements)
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interface.elements = [interface_slave_elements; interface_master_elements]
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interface.properties.dual_basis = true
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interface.properties.contact_state_in_first_iteration = :AUTO
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push!(interface.postprocess_fields, "contact pressure")
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solver = NonlinearSolver(upper, lower, bc_upper, bc_lower, bc_sym13, bc_sym23, interface)
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solver.xdmf = Xdmf("contact_two_blocks_postprocess"; overwrite=true)
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solver()
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node_ids, displacement = get_nodal_vector(interface.elements, "displacement", 0.0)
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node_ids, geometry = get_nodal_vector(interface.elements, "geometry", 0.0)
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# node_ids, pressure = get_nodal_vector(interface.elements, "contact pressure", 0.0)
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u3 = [u[3] for u in displacement]
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maxabsu3 = maximum(abs(u3))
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stdabsu3 = std(abs(u3))
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info("max(abs(u3)) = $maxabsu3, std(abs(u3)) = $stdabsu3")
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@test isapprox(stdabsu3, 0.0; atol=1.0e-12)
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upper_X = [0.5, 0.5, 0.75]
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lower_X = [0.5, 0.5, 0.25]
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strain_upper = upper("strain", upper_X)
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stress_upper = upper("stress", upper_X)
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strain_lower = lower("strain", lower_X)
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stress_lower = lower("stress", lower_X)
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info("strain at $upper_X = $strain_upper")
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info("stress at $upper_X = $stress_upper")
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info("strain at $lower_X = $strain_lower")
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info("stress at $lower_X = $stress_lower")
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end
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