In commercial codes, the modeling of plastic materials lags behind compared to that of many other materials. As a result, engineers have been using material models developed for metal to model plastic materials. This paper discusses the stress-strain behavior of thermoplastics relevant to crash simulation, examines the plastic material modeling capability of a commercial code LS-DYNA and presents needed model enhancements. Addressing the need of vehicle crash simulation, LSTC has made significant improvement in modeling plastic materials, as demonstrated by the new models, MAT81 and MAT89, in LS-DYNA 950 version. Nevertheless, the modeling capability of these models is not complete. Further enhancement is needed in the modeling of the rate dependence of the modulus and failure strain, pressure dependence of the yield stress and variable Poisson's ratio. Accordingly, the high strain rate testing technique should be improved to measure these properties.
Plastic material modeling for vehicle crash simulation using LS-DYNA
2001
5 Seiten, 4 Bilder, 1 Tabelle, 7 Quellen
Aufsatz (Konferenz)
Englisch
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