When using FEA simulations for die design, a primary task is predicting the peak stress of a porthole die. By accurately estimating the tool stress under load, it is possible to predict whether or not a mandrel might be subject to permanent plastic deformation. For this kind of analysis engineers may make use of Altair SimLab‚Ñ¢ to accurately analyze the performance of complex assemblies. In the SimLab environment, an elastoplastic analytical model is available, which provides the behavior of hot working steel at different temperatures. This is critical when looking to accurately predict the tool stress.