What is stress stiffness matrix?

[drennon236]

This is a FEA buckling problem, and I am not sure what is meant by stress stiffness matrix and elemental stress stiffness matrix?

 

[FEA way]

These matrices and the whole eigenvalue problem definition for linear buckling analyses are explained in FEM textbooks. For example in "Concepts and Applications of Finite Element Analysis" by R.D. Cook. You should study this topic from the beginning of its description to fully understand the governing equation for this type of analyses.

 

[rb1957]

an element is a piece of the whole. Sum the elemental stiffness matrices to get the stiffness matrix of the whole structure.

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