Abstract
In numerical modeling of material behavior, deformation is calculated with analytical constitutive equations. When joined with a failure criterion, simulations can predict plastic stress–strain behavior and eventual fracture of the material. The Air Force Institute of Technology (AFIT) uses the Johnson–Cook empirical constitutive equation and damage criterion to model high speed wear. The Johnson–Cook equations employ material parameters which must be characterized experimentally for each material being simulated for accurate results. This paper describes the testing and analytics used to determine the Johnson–Cook constitutive and damage material coefficients for treated 4130 steel. The flow and damage coefficients are calculated and the results are used to construct a finite element model in ABAQUS. This model is compared against the experimental data for final validation.
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