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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

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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?