20 Ton A-frame under loading Von Mises stress plot shown, with the worst areas in red. All A-frames are modeled in a 3-D FEA program to check stress levels on a global scale or check for stress concentrations.

Sub model of a cargo stern ramp with a pressure load. The plot shows the Von Mises stress levels in the model.

Sub model of an A-frame Foundation showing the Von Mises stress levels in the structure. Stress concentration are also checked at this stage.

Normal stress distribution in the vertical direction for a lifting padeye. Padeyes are checked with FEA to get an accurate state of stress around the hole, hinge foundation and lifting pad eye.