Geometric stiffness matrix formulation for truss topopt #58
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mohamed82008
reviewed
Aug 5, 2021
src/TrussTopOptProblems/buckling.jl
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| So should be used as R*K*R' instead of R'*K*R as indicated in | ||
| https://people.duke.edu/~hpgavin/cee421/truss-finite-def.pdf | ||
| """ | ||
| function compute_local_axes(end_vert_u, end_vert_v) |
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mohamed82008
reviewed
Aug 5, 2021
src/TrussTopOptProblems/buckling.jl
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| # else | ||
| # px = penalty(density(vars[varind[i]], xmin)) | ||
| # end | ||
| Kσ_e = px * Kσ_e |
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I am not sure if we should do this for trusses unless we are going for 0-1 designs. If the thickness is optimized then the Ksigma comes from the stress and we shouldn't multiply by the density in assembly here.
Displacement dudx dim fixed. IterativeSolver abstol call fixed
Clean up recent Makie breaking changes
test/runtests.jl
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| include("examples/test_examples.jl") | ||
| end | ||
| end | ||
| # @safetestset "Examples" begin |
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Can we uncomment these now?
mohamed82008
approved these changes
Nov 16, 2021
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Summary
This PR includes supports for buckling modeling of truss structures. It contains geometric stiffness matrix formulations, related tests, and detailed documentation with clear literature pointers. It closes #25.
Highlights:
test/truss_topopt_problems/test_geometric_stiffness_matrix.jlincludes an example of using the geometric stiffness matrix and a hand-made forward Euler integration to simulate large displacement.test/truss_topopt_problems/test_buckling.jlincludes examples to check that the ground mesh is stable and the compliance-optimized truss is not stable by using the geometric stiffness matrix.Minor changes:
examples/benchmarkin favor of our latest WCSMO21 benchmarksWhat type of change is this?
Checklist
] test).