Foam materials are widely used in automotive industry such as energy absorbers and comfort enhancers. Because of high energy absorbing capability of foams, they became very important in vehicle crashworthiness. So in this manner, FE modelling of foam materials also becomes important. Although foam materials are very promising materials, not that much study has been done about foams comparing to other commonly used materials like steel, etc. In contrast to sophisticated models, in LS-DYNA for practical engineering purposes the foam model *MAT_FU_CHANG_FOAM (MAT83) is available. The main assumption of MAT83 is, that Poisson's ratio is equal to zero for foams and therefore no coupling between the material axes is present. This leads to a one-dimensional material law, where experimental curves of uni-axial test can be used directly. The aim of this work is to provide a method and to develop a computer program in order to generate reliable input data for the simulation of EPP foam with MAT83 in LS-DYNA. Experimental raw data have to be prepared and extended respectively. In addition, suitable density laws have to be developed in order to provide LS-DYNA input data for intermediate densities, where no experimental data are available. To verify the reliability of the results, simulations with the generated curves are compared to an independent experimental database and to some real experimental applications. As seen from the results of comparisons between models and real applications, numerically generated load curves, that demonstrate the behaviour of foam material with a density lying within the range, is reliable. This saves a lot, for engineers who are working with different densities of EPP foam and don't have that big databases including all the densities they use.
Modelling of foams using MAT83 - Preparation and evaluation of experimental data
Modellbildung für Schäume mit MAT83 - Aufbereitung und Auswertung der experimentellen Daten
2003
13 Seiten, 11 Bilder, 8 Quellen
Aufsatz (Konferenz)
Englisch
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