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I am writing my finite element code for linear elasticity analysis withlineartetrahedral elements. I am not new to the finite element method and my code already works well with element types of triangles, quadrangles in 2D and hexahedrons in 3D but I don't get the correct result with tetrahedrons. I doubt the calculation of the element stiffness matrix and need a valid stiffness matrix of a single tetrahedron for comparison. Does anyone has hands on such software ?

Attachment contains the stiffness matrix and its eigenvalues from my code for a unit tetrahedron whose base are at (1,0,0), (0,1,0), and (0,0,1) and whose apex at (0,0,0), with Young's modulus of 200 MPa and Poisson's ratio of 0.3.

Your help is highly appreciated.

Hassan

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# Stiffness Matrix for Linear Tetrahedral Element

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