Some of the quantities calculated above, and stored in the ClaLam object are used to estimate laminate shear loading response.
The different steps of the calculation are described below:
If out-of-plane average shear forces are specified, the resolution of the following linear system of equations allows to calculate the corresponding out-of-plane shear strains:
(The CTE and CME related terms are optional.) The resolution of this equation is done following the same approach as for the in-plane and bending loading. One performs a Gaussian elimination in a matrix. Constraints can be imposed if out-of-plane shear strains are specified for some components of the loading instead of out-of-plane lineic shear force.
(The CTE and CME related terms are optional.) Once and are known, the corresponding loading in laminate axes is obtained with:
in which the matrix is relative to the station at which the stress is requested.
Then, ply stresses are given by
in which the matrix is relative to the station at which the stress is requested.
(The CTE and CME related terms are optional. One takes benefits of the “decoupling of out-of-plane shear” assumption.)