Numerical Model of Ductile Fracture Kinetics: Comparison of Results of 2-D Simulations to Experimental Data

摘要

Implementation of kinetic description of evolution of damage in material is necessary for specific cases, when total duration of the whole process and duration of damage development are comparable, e.g. for hypervelocity acceleration and impact. To provide this capability, isotropic model of kinetics of ductile fracture of structure materials was developed on basis of NAG model (Nucleation and Growth) and introduced into elastic-plastic DMK and MIMOZA 2-D codes. Special experiment was conducted: Steel 3 cylinder sample was loaded by sliding detonation of the high explosive layer of variable thickness that produced the axial cone-like cavern. Clear and distinctive data obtained in this simple experiment could be recommended for testing of 2-D numerical codes intending to model dynamic ductile fracture of material. Numerical simulations of this experiment were performed using DMK and MIMOZA codes implementing developed isotropic model of kinetics of ductile fracture. Simulated dimensions of the axial cone-like cavern are in good agreement with experimental data.