For aeronautical applications, it is important to understand the dynamic failure behavior of structures subject to impact loadings in order to improve their survivability. Structures subjected to impact loading are affected by large deformation, high strain-rate effect, temperature softening, and varying state of stress, which may finally lead to material and structural failure. It has also shown that impact characteristics are different with independent factors, such as, impact velocity, material thickness, and shape and orientation of the impacting object. In this talk, a new generic thermo-elastic/viscoplastic material model with regularized failure will be presented. The implementation of this material failure model into a nonlinear explicit dynamic finite element code will be discussed. The effectiveness of this material failure model will be demonstrated by accurately predicting ballistic limit and failure mode.