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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › I’ve been trying to implement eigenvalue buckling simulation for solid elements › Reply To: I’ve been trying to implement eigenvalue buckling simulation for solid elements

October 14, 2024 at 2:45 am
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I derived Cook's theory and also rewrote Borst's theory. When they introduced the calculation formula for the geometric stiffness matrix of solid elements, the geometric stiffness matrix they computed had non-zero elements. Why is the geometric stiffness matrix output by ANSYS APDL entirely composed of non-zero elements? Was the calculation incorrect?