I am trying to do some analysis with CQUADX4 elements with SOL 101. I was trying to understand the results and investigating the stiffness matrix.So I obtained the stiffness matrix of the elements from Nastran. I also tried to derived the stiffness matrix of CQUADX4 element myself. Does these elements apply gauss quadrature to derive stiffness matrix? If so, does it use a 2-point gauss quadature or other types?
Also, I have been able to extract the stiffness matrix from Nastran for the entire mesh through:
Is there any way I can obtain the local stiffness matrix of just one element?