Presented is a critical analysis of the spot weld modelling techniques for the vibrational behaviour of automotive structures. The approach is based on experimental and numerical works. It is particularly focused on the quality of modal bases and frequency response functions. Recalled are important characteristics for numerical models in mechanics and distinguished are mechanical hypotheses and numerical choices. Listed are the different classes of current spot weld models. Described are the four spot weld models retained for the study, namely two punctual and two surfacic ones. The first problem treated, an academic one, concerns two plates and three spot welds. The second problem, an industrial one, concerns a front subframe. The main result is that, to evaluate the stiffness of an assembly, a punctual spot weld model is not satisfactory. This choice is physically inconsistent and leads to imprecise and unstable results. A surfacic approach is stable and can lead to predictive results. Two variants of this approach were tested. On an industrial point of view, at the present time, a surfacic model associated with a non-coincident mesh technique is the most convenient approach.
Spot weld modelling techniques and performances of finite element models for the vibrational behaviour of automotive structures
Modellierungsverfahren für Punktnähte und Eigenschaften von Finite-Elemente-Modellen für das Schwingungsverhalten von Automobilkonstruktionen
2000
8 Seiten, 10 Bilder, 4 Tabellen, 5 Quellen
Aufsatz (Konferenz)
Englisch
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