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Progressiv​e Ply Failure



I am using Femap with NX Nastran solver. I am looking into ways of conducting a progressive failure analysis for composite laminates using Femap/NX Nastran. It will be great if anyone can provide any inputs/references. I am trying to use some stiffness reductions factors so that when you see a ply failure, you want your elements in that region to have their stiffness reduced.