Compatible finite element modelling of laser welded region for crash analysis of autobody assemblies

摘要

This paper proposes a compatible modelling method for finite element analysis of the lasernwelding for autobody assemblies in the crash analysis. The fracture modes of a laser weld wereninvestigated for application to finite element modelling. A single laser weld in a stitch shape wasnmodelled by a cluster of beam elements or hexahedron elements. The model was then applied tona cross tension test and a lap shear test under the quasi-static loading condition bothnexperimentally and numerically. Finite element analyses were carried out with respect to thenelement type, the number of elements and the panel mesh size. The numerical result wasncompared with experimental results under the same condition. Analysis results demonstrate thatnthe load acting on the laser welded element is accurately calculated by the change of the elementntype and the location of welded constrains. The method proposed provides a guideline fornaccurate finite element modelling of the laser welded region for the crash analysis of vehicles.