How can I make a strain energy distribution plot for a PSD analysis? We tried using an ETABLE item with (ETABLE,name,SENE), but we could not plot it.
Not all the usual result quantities are available after a psd analysis. Only the component displacements and stresses are available. Derived quantities like strain energy are not available because they cannot be computed from the unsigned one-sigma component results. An approximate method is to perform a /POST1 ETABLE combination of the modal results factored by the PSD modal coefficients.
Here is an example. Since the variance retrieved with *GET is the square of the mode coefficient and the strain energy is a product of stress and strain, the *GET value can be used directly since the mode coefficient needs to be applied twice.
sadd,send_tot,send_m1,send_m2,q11,q22 ! add modes 1 and 2
sadd,send_tot,send_tot,send_m3,1,q33 ! add mode 3 to total