#FiniteElementAnalysis

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Kevin Moerman 🔓🦿So how do you turn contours (see previous post) into surface geometry? Well you can create a "levelset image", it is a bit like a heat propagating positively outward and negatively inward from the contours. Instead of heat though you can use the distance to the contour. Next you can draw the isosurface at the level 0 to retrieve the surface. If one segments stuff using voxel labels it can be hard to retrieve a smooth result. Here however the contours are smoothly interpolated curves and the isosurface is smoothly interpolated as well. Hence there is naturally less of a stepped-Lego issue :). In the video below the image on the right is the wobbly STL that comes with the Visible Human project. I tried to do better based on the contours-level set approach. I can also control the surface mesh density as you can see in the middle image. <a href="https://fediscience.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fediscience.org/tags/Julialang" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Julialang</a> <a href="https://fediscience.org/tags/biomedicalengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#biomedicalengineering</a> <a href="https://fediscience.org/tags/finiteelementanalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#finiteelementanalysis</a> <a href="https://fediscience.org/tags/biomechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#biomechanics</a> <a href="https://fediscience.org/tags/segmentation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#segmentation</a>Open source projects used here: <a href="https://github.com/COMODO-research/Imago.jl" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/COMODO-research/Imago.jl</a><a href="https://github.com/COMODO-research/Comodo.jl" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/COMODO-research/Comodo.jl</a><a href="https://github.com/COMODO-research/Geogram.jl" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/COMODO-research/Geogram.jl</a>

Kevin Moerman 🔓🦿Work in progress on the simulation of the biomechanics of mammography. This is a parameterised model, the geometry, the finite element mesh, and the boundary conditions are automatically created. Created using <a href="https://fediscience.org/tags/Comodo" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Comodo</a> in <a href="https://fediscience.org/tags/JuliaLang" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#JuliaLang</a> <a href="https://fediscience.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a><a href="https://github.com/COMODO-research/Comodo.jl" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/COMODO-research/Comodo.jl</a>The prototype lives here: <a href="https://github.com/COMODO-research/Mammo.jl" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/COMODO-research/Mammo.jl</a><a href="https://fediscience.org/tags/biomechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#biomechanics</a> <a href="https://fediscience.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a>

Kevin Moerman 🔓🦿:julia:Working on automated parameterised meshing of <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> of periodic auxetic structures. <a href="https://fosstodon.org/tags/Julialang" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Julialang</a> <a href="https://fosstodon.org/tags/ComputationalMechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ComputationalMechanics</a> <a href="https://fosstodon.org/tags/ComputationalDesign" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ComputationalDesign</a> <a href="https://fosstodon.org/tags/Comodo" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Comodo</a> <a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> More on auxetic structures: <a href="https://en.wikipedia.org/wiki/Auxetics" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://en.wikipedia.org/wiki/Auxetics</a>Built using the Comodo project: <a href="https://github.com/COMODO-research/Comodo.jl" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/COMODO-research/Comodo.jl</a>

Kevin Moerman 🔓🦿:julia:Playing with <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> of an "expansion mesh" like structure. The geometry, mesh and boundary condition creation, as well as the FEA analysis, all occur automatically. This simulation is still elastic, next step is to add plasticity. <a href="https://fosstodon.org/tags/ComputationalMechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ComputationalMechanics</a> <a href="https://fosstodon.org/tags/GIBBON" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GIBBON</a>

Kevin Moerman 🔓🦿:julia:So satisfying to finally reach 100% code coverage for testing! Hoping to publish paper on Comodo by the end of the year. If you are into <a href="https://fosstodon.org/tags/ComputationalMechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ComputationalMechanics</a> <a href="https://fosstodon.org/tags/Biomechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Biomechanics</a> <a href="https://fosstodon.org/tags/GeometryProcessing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GeometryProcessing</a> <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> help to contribute to Comodo.jl and FEBio.jl and you'll be one of the authors! <a href="https://github.com/COMODO-research/Comodo.jl" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/COMODO-research/Comodo.jl</a><a href="https://fosstodon.org/tags/julialang" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#julialang</a> <a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/ContinuousIntegration" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ContinuousIntegration</a> <a href="https://fosstodon.org/tags/CodeCov" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CodeCov</a>

Kevin Moerman 🔓🦿:julia:And say hello to Gibbon.jl, ongoing work towards a <a href="https://fosstodon.org/tags/JuliaLang" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#JuliaLang</a> implementation of the MATLAB toolbox GIBBON (<a href="https://www.gibboncode.org/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.gibboncode.org/</a>. )First pass at Gibbon.jl <a href="https://github.com/gibbonCode/Gibbon.jl/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/gibbonCode/Gibbon.jl/</a><a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/openscience" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#openscience</a> <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> <a href="https://fosstodon.org/tags/ComputationalMechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ComputationalMechanics</a> <a href="https://fosstodon.org/tags/biomechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#biomechanics</a>

IT NewsBlame It on the Sockets: Forensic Analysis of the Arecibo Collapse - Nearly three years after the rapid unplanned disassembly of the Arecibo radio tele... - <a href="https://hackaday.com/2023/08/29/blame-it-on-the-sockets-forensic-analysis-of-the-arecibo-collapse/" rel="nofollow noopener noreferrer" target="_blank">https://hackaday.com/2023/08/29/blame-it-on-the-sockets-forensic-analysis-of-the-arecibo-collapse/</a> <a href="https://schleuss.online/tags/finiteelementanalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#finiteelementanalysis</a> <a href="https://schleuss.online/tags/neutronimaging" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#neutronimaging</a> <a href="https://schleuss.online/tags/radiotelescope" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#radiotelescope</a> <a href="https://schleuss.online/tags/engineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#engineering</a> <a href="https://schleuss.online/tags/collapse" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#collapse</a> <a href="https://schleuss.online/tags/forensic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#forensic</a> <a href="https://schleuss.online/tags/arecibo" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#arecibo</a> <a href="https://schleuss.online/tags/failure" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#failure</a> <a href="https://schleuss.online/tags/spelter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#spelter</a> <a href="https://schleuss.online/tags/socket" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#socket</a> <a href="https://schleuss.online/tags/cable" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#cable</a> <a href="https://schleuss.online/tags/news" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#news</a> <a href="https://schleuss.online/tags/zinc" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#zinc</a>

Kevin Moerman 🔓🦿:julia:New <a href="https://fosstodon.org/tags/preprint" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#preprint</a> : "Experimental and Computational Analysis of Energy Absorption Characteristics of Three Biomimetic Lattice Structures Under Compression" <a href="https://arxiv.org/abs/2308.14452" rel="nofollow noopener noreferrer" target="_blank">https://arxiv.org/abs/2308.14452</a> <a href="https://fosstodon.org/tags/finiteelementanalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#finiteelementanalysis</a> <a href="https://fosstodon.org/tags/biomechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#biomechanics</a> <a href="https://fosstodon.org/tags/lattice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#lattice</a>

Kevin Moerman 🔓🦿:julia:Saw a paper on a soft robotic star thing, and had to check. Yep I can confirm, it looks like it can grab things. Paper: <a href="https://doi.org/10.1002/aisy.202200435" rel="nofollow noopener noreferrer" target="_blank">https://doi.org/10.1002/aisy.202200435</a><a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> Here is a link to my fully parameterized implemention with <a href="https://fosstodon.org/tags/FEBio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FEBio</a> + <a href="https://fosstodon.org/tags/GIBBON" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GIBBON</a>: <a href="https://www.gibboncode.org/html/DEMO_febio_0085_soft_robotic_star_01.html" rel="nofollow noopener noreferrer" target="_blank">https://www.gibboncode.org/html/DEMO_febio_0085_soft_robotic_star_01.html</a>

Kevin Moerman 🔓🦿:julia:GIBBON is ready for <a href="https://fosstodon.org/tags/CMBBE2023" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CMBBE2023</a> ! Heading to Paris tomorrow and can't wait to present the latest implementations and upgrades for FEBio4. If you are attending the workshop, upgrade GIBBON to the latest version: <a href="https://www.gibboncode.org/" rel="nofollow noopener noreferrer" target="_blank">https://www.gibboncode.org/</a><a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/biomechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#biomechanics</a> <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> <a href="https://fosstodon.org/tags/ComputationalMechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ComputationalMechanics</a> <a href="https://fosstodon.org/tags/MechanicalEngineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MechanicalEngineering</a><a href="https://www.cmbbe-symposium.com/2023/workshops/" rel="nofollow noopener noreferrer" target="_blank">https://www.cmbbe-symposium.com/2023/workshops/</a>

Kevin Moerman 🔓🦿:julia:<a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/GeometryProcessing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GeometryProcessing</a> <a href="https://fosstodon.org/tags/meshing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#meshing</a> <a href="https://fosstodon.org/tags/finiteelementanalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#finiteelementanalysis</a>

Kevin Moerman 🔓🦿:julia:Checking out "Taubin" smoothing. Looks great for smoothing voxel derived meshes. Video shows voxel mesh (red) of a femur and the Taubin smoothed surface retrieved (white). One of Taubin's papers: <a href="https://doi.org/10.1109/ICCV.1995.466848" rel="nofollow noopener noreferrer" target="_blank">https://doi.org/10.1109/ICCV.1995.466848</a><a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> GIBBON implementation: <a href="https://www.gibboncode.org/html/HELP_smoothTaubin.html" rel="nofollow noopener noreferrer" target="_blank">https://www.gibboncode.org/html/HELP_smoothTaubin.html</a><a href="https://fosstodon.org/tags/biomechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#biomechanics</a> <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> <a href="https://fosstodon.org/tags/meshing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#meshing</a> <a href="https://fosstodon.org/tags/GeometryProcessing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GeometryProcessing</a>

Kevin Moerman 🔓🦿:julia:Here the strain that you think you are applying (red curve) and the real strain in the middle layer (green curve) are plotted over time. As you can see a compressive Z-strain builds up during clamping which may offset the strain graph a lot. Note this is Green-Lagrange strain. The linear tensile strain intended to be applied is 30%, the linear clamping strain is -30%. <a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> <a href="https://www.gibboncode.org/html/DEMO_febio_0065_clamp_tension_test.html" rel="nofollow noopener noreferrer" target="_blank">https://www.gibboncode.org/html/DEMO_febio_0065_clamp_tension_test.html</a>

Kevin Moerman 🔓🦿:julia:Indentation with a twist. The rigid ball pushes into the rubber-like hyperelastic cube while also spinning. Friction then transfers torsional forces to the cube as well. <a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/GIBBON" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GIBBON</a> <a href="https://fosstodon.org/tags/FEBio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FEBio</a> <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> <a href="https://www.gibboncode.org/html/DEMO_febio_0028_sphere_indentation_friction_twist.html" rel="nofollow noopener noreferrer" target="_blank">https://www.gibboncode.org/html/DEMO_febio_0028_sphere_indentation_friction_twist.html</a>

Kevin Moerman 🔓🦿:julia:New <a href="https://fosstodon.org/tags/openaccess" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#openaccess</a> <a href="https://fosstodon.org/tags/preprint" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#preprint</a> with collaborators Shaiv Parikh et al. "Biomechanical characterisation of thoracic ascending aorta with preserved pre-stresses"<a href="https://doi.org/10.1101/2022.12.02.518810" rel="nofollow noopener noreferrer" target="_blank">https://doi.org/10.1101/2022.12.02.518810</a> Features some lovely automated meshing and <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a> with GIBBON

Kevin Moerman 🔓🦿:julia:Here is a nice review paper on: "What Kelvin might have written about Elasticity" <a href="https://doi.org/10.1111/j.1365-2478.2011.01049.x" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://doi.org/10.1111/j.1365-2478.2011.01049.x</a>And more on benefits for use with <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a>: <a href="https://arxiv.org/pdf/1605.09606" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://arxiv.org/pdf/1605.09606</a>

Kevin Moerman 🔓🦿:julia:Automated meshing of a bifurcation (e.g. for blood vessel <a href="https://fosstodon.org/tags/FiniteElementAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FiniteElementAnalysis</a>) with hexahedral elements using <a href="https://fosstodon.org/tags/opensource" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opensource</a> <a href="https://fosstodon.org/tags/GIBBON" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GIBBON</a> toolbox. 1) Take a cylinder 2) Cut a hole at bifurcation curve 3) Create direction vectors for surface "departure and arrival" 4) Use smooth bezier spline based lofting 5) Thicken quads to form hex. elements. Demo rendered here: <a href="https://www.gibboncode.org/html/DEMO_mesh_bifurcation_cut_loft_branch.html" rel="nofollow noopener noreferrer" target="_blank">https://www.gibboncode.org/html/DEMO_mesh_bifurcation_cut_loft_branch.html</a>Bezier approach was inspired by <a href="https://mastodon.social/@acegikmo" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@acegikmo</a> 's spline work

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