This paper describes a study that was undertaken to simulate impacts on laminated float glass/polycarbonate/float glass panels using the Johnson-Holmquist (JH-2) model for brittle materials and the EPIC explicit finite element code. The simulation results are compared with observed impact results obtained by others. The JH-2 model was originally successfully calibrated to treat impact on thick monolithic glass slabs. In this study recent spall strength data for glass reported in the literature was used to revise the JH-2 model for application to thin laminated glass panels — a system of wide technical interest. The JH-2 coefficients developed were further validated by comparison with an additional independent data set obtained from the literature involving glass rod impact data. A good fit to both data sets considered was produced suggesting that the revised JH-2 coefficients proposed are reasonable.

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