@Jim.. Thanks for the feedback. You are right. I tried running both models using isotropic properties as you suggested. They behave the same. I have also run 3D solid model using tranformed properties ( using tranformation matrix which will have 2 materials card for 0 and 90 ply and applies to 2D shell model) and by defining different material direction for elemnts in 0 and 90 degree ply (only one material card). Both models also behave the same. I guess my orthotropic material orientation is some how wrong for 2D shell model. I had also created a post regarding this to which the link is attcahed below. My material orientation agress to direction as described in the post. Do you have any suggestions on confirming the material direction for the 2D shell element?