Comparison of two analytical models of blanking and proposal of a new model

With the development of accurate Finite Element models of the punching/blanking process by the present authors and other researchers, important possibilities emerged to model and analyse the process in a research environment. However, Finite Element models are less well suited for use in a production environment, to monitor the process in real time. For real-time monitoring applications, an analytical model could potentially be used to extract relevant information from measurements of force and displacement. In this article, first, two existing analytical models of blanking are compared. One model is based on the assumption of pure shear and the other is a tension model. Secondly, an addition to the shear model is proposed, resulting in a new analytical model, which allows for the modelling of plastic bending during the process. Results of the new model are compared against experimental findings, and show good similarity for the materials tested. Particular attention is paid to the assumptions and the stress–strain systems inherent in the models.