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I wrote a finite element code for three-dimensional analysis of elastic body using MATLAB programming language.
Here is a video of the results + its verification with Abaqus:
Output results are shown in Tecplot; hexahedron elements are used; Basic conjugate gradient method (BCG) is used to solve linear solutions to be able to solve large number of nodes and elements.
Do not hesitate to contact me via email (firstname.lastname@example.org) for MATLAB files: