As with Pro, the optimization uses all of the FEA computed shell element in-plane membrane forces
, out of plane transverse shear forces, and bending moments.
For any plate problem described by a fourth-order partial differential equation or coupled with two second-order equations in the presence of membrane forces
, the classical plate equation and two Poisson equations serve as substitute equations.
n],--stress in direction; N-matrix of membrane forces
; M-matrix of bending moments; A-mid-plain strains to membrane forces
relation; B-coupling between bending and membrane load; D-curvatures to bending moments relation; [epsilon]--mid-plane; [kappa]--curvatures; [Q.