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Ansys Learning Forum Forums Discuss Simulation General Mechanical Geometric stiffness matrix for solid elements Reply To: Geometric stiffness matrix for solid elements

Akshat Gupta
Ansys Employee

Hello,

The stiffness matrices obtained using APDL may differ from the traditional stiffness matrices derived in textbooks. This discrepancy may arise because APDL calculates stiffness matrices through numerical integration methods.

For a deeper understanding of how these matrices are formulated, please go to the help document and refer to the sections shared below:

Derivation of Structural Matrices:

  • Ansys Help > MAPDL > 2. Structures > 2.2 Derivation of Structural Matrices

Stress Stiffening:

  • Ansys Help > MAPDL > 3. Structures with Geometric Nonlinearities > 3.4. Stress Stiffening

Thanks.