Finite Element Calculation with Tetrahedral Mesh Generation

This source code implements finite element calculation using tetrahedral mesh generation. The program processes deformation body discretization into tetrahedral elements, inputs node coordinates, and employs elastoplastic constitutive models to transform load-displacement relationships into linear equation systems. It serves as an effective solution for analyzing simple 3D deformation bodies, with capabilities to output element deformation quantities and stress distributions. Key algorithmic features include tetrahedral element stiffness matrix formulation and efficient linear system solvers.