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Study of Damage Phenomenon of Thermoplastic Composite: Application in the Automobile Industry


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DOI: https://doi.org/10.15866/ireme.v16i5.22165

Abstract


In this paper, a numerical study on the different parameters that characterize the phenomenon of rupture of thermoplastic materials reinforced with long glass fibers has been made. The material under investigation is polypropylene reinforced with 70% glass fibers (PP-GF70), which has been chosen for its mechanical and thermal properties. The effort done in this research is to use the Johnson-Cook failure law as a numerical model to model the failure of this material, with the goal of identifying the damage coefficients Di (i=1,...,5). The methodology used is to simulate the tensile test by comparing the specimen’s numerical behavior to the experimental data in order to plot the curves of the strain at failure as a function of triaxiality, taking strain rate, and temperature into consideration. The goal is to find and optimize these factors, so that numerically reproducing the same fractures as in the test is possible. The research reported in this study aims to include this new composite generation into crash simulations for car development.
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Keywords


Johnson-Cook Rupture Law; Triaxiality; Modelling; PP-GF70; Crash

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