stress occurred in SHELL & Solid Plate of Same Config in Altair OptiStruct Posted January 6 · Report reply Hi all, I had modeled a steel Plates of two Cases of Same config as shown in fig. Case :1 2D PLATE 2mm Thickness, F=140N(10N/14 Nodes), constraints at opposite end. Case :2 3D hex Plate 2mm Thickness with 2 Layer of Mesh, F=140N(10N/14 Nodes), constraints at opposite end. Clarification required : 1. Both plates are same in Boundary conditions , dimensions and material property. only the element type varies but why the stress induced is different ?