WEB Outline of a regularised damage-plasticity material model for clinchingTuesday (22.09.2020) 11:20 - 11:35 Z: Special Symposia II Part of:
Clinching becomes increasingly popular in industrial applications to join sheets of different materials. Benefits can be identified in the manufacturing process and the fatigue strength. The latter, however, requires a reliable simulation of the material behaviour especially focusing on the process-induced damage that is expected to influence the ultimate joint strength and its fatigue limit. For the clinching of metals, a regularised damage-plasticity material model is outlined to describe the strongly coupled plastic and damage evolutions. The plasticity model is based on the Hill yield criterion for anisotropic materials to reproduce the inherent orthotropy of the sheets to be joined and extended to finite strains by the logarithmic strain space. Curing of the damage-induced localisation is achieved by gradient-enhancement of the non-local damage, which is introduced as an additional degree of freedom for the regularisation. Both, plasticity and damage, are strongly coupled but can evolve independently by means of a dual-surface approach. A detailed overview of the model and its numerical implementation are given together with numerical examples. The latter show the successful damage regularisation properties, its further possibilities and applicability to clinching.