Yield buckling check

The yield and buckling check verifies that plating and stiffeners stay below the material yield stress and above the buckling limit under combined hull-girder and local loads. The yield check compares an equivalent (von Mises) stress against the permissible fraction of the minimum yield, while the buckling check compares the applied in-plane compression and shear against the panel’s critical or ultimate buckling stress, expressed as a usage factor that must not exceed 1.0. The Common Structural Rules apply both to every plate field and stiffener, since a deck or bottom panel can be well below yield yet buckle under hull-girder compression in sagging or hogging. Slenderness, aspect ratio, residual stress, and lateral pressure all enter the buckling capacity.