Comparison of heterogeneous material models for solving impact spall fracture problems.

The responses of two models of heterogeneous medium to impact loading are compared, namely, the direct numerical simulation model and the additive mixture model. Verification of Ni and Ti material parameters in the simulation of spall in a homogeneous barrier is performed. The calculated free surface velocity for homogeneous plates corresponds to the experimental data with an accuracy of at least 10%. A simulation of the impact loading process of plates made of Nitinol based on mathematical models of heterogeneous materials has been performed. The additive mixture model more accurately reproduces the free surface velocity profiles than direct numerical simulations. Nevertheless, the deviation of numerical simulation results from experimental data does not exceed 10% for both models. A comparison of the results of the models' responses to impact loading has shown that it is acceptable to use both models in problems considering alloys as heterogeneous media. [ABSTRACT FROM AUTHOR]