Constitutive modeling of aluminum nitride for large strain, high-strain rate, and high-pressure applications

This paper presents constitutive modeling of aluminum nitride (AlN) for sev ere loading conditions that produce large strains, high-strain rates, and h igh pressures. The Johnson-Holmquist constitutive model (JH-2) for brittle materials is used. Constants are obtained for the model using existing test data that include both laboratory and ballistic experiments. Due to the wi de range of experimental data the majority of constants are determined expl icitly. The process of determining constants is provided in detail. The mod el and constants are used to perform computations of many of the experiment s including those not used to generate the constants, The computational res ults are used to validate the model, provide insight into the response of A IN, and to demonstrate that one set of constants can provide reasonable res ults over a broad range of experimental data. (C) 2001 Elsevier Science Ltd . All rights reserved.