peteroznewman
Subscriber

A simple bilinear material model called Elastic Perfectly Plastic (EPP) is often used in engineering analysis. The Tangent Modulus is zero. This material model usually provides conservative predictions of failure. That means if you simulate a safety test and pass with this material model, it is highly likely that a physical test will pass since the real material has some non-zero tangent modulus that can carry more load than the EPP material model.