(continuation) This paper is concerned with finite element predictions of the impact performance of plastics mouldings using elastic-plastic models. It is the second part of two papers. Part 1 contains detailed descriptions of three elastic-plastic models: von Mises, linear Drucker-Prager and the National Physical Laboratory developed cavitation model plus calculation of the relevant model parameters. This part contains complementary coverage of the elastic plastic models. The main emphasis of this part is the use of these models to predict the deformation of subcomponents cut from interior door trim mouldings supplied by Jaguar Land Rover. Predictions are compared with measurements at a range of loading speeds. The finite element simulation has been analysed by using different element types (solid/shell), different analysis types (rate independent/rate dependent) and studying the influence of friction and impact location. Results are presented of a small study carried out to indicate how sensitive the predictions are to changes in the cavitation model parameters. The following conclusions can be drawn from the work presented in this paper: 1. When compared with the cavitation model, the linear Drucker-Prager is found, for the cases investigated, to be adequate despite the simplifying assumptions, although the predicted component deformation may be dissimilar at larger displacements. The von Mises model gives the least accurate predictions of component behaviour. 2. Shell elements are able to predict the deformation of the component reasonably well. Stress and strain predictions from shell elements showed good agreement with those from the solid element analysis when compared with values obtained for the mid layer of the component. 3. Friction occurs between the component surface and the indenter and so should be included in the analyses. 4. Rate dependent plasticity should be included when predicting deformation behaviour over a range of loading speeds and also when analysing parts with complex shapes. 5. Modulus and flow stress are the most influential materials parameters in the cavitation model. In the small region of elements studied, changing modulus had little effect on predicted stress and strain values, while changing the flow stress caused a significant change in predicted stress.
Prediction of impact performance of plastics mouldings. Part 2: Finite element simulations
Die Vorhersage der Schlagfestigkeit von Kunststoffformteilen. Teil II: Finite-Elemente-Simulationen
Plastics, Rubber and Composites ; 36 , 1 ; 14-25
2007
12 Seiten, 22 Bilder, 11 Tabellen, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
Finite-Elemente-Methode , Simulationsmodellbildung , Theorie-Experiment-Vergleich , Bewertung , elastoplastische Bruchmechanik , Aufprall , Verformungsgeschwindigkeit , Schlagfestigkeit , Kunststoffformteil , Türmodul , Kunststoffkarosserieaußenteil , Kavitation , Zuverlässigkeitsvoraussage , Elastizitätsmodul , Fließspannung
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