Dynamic mechanical properties of sintered tungsten alloys

Abstract

Numerical simulations are effective approach for the safety design of machines and structures subjected to impact loading and the investigation of impact phenomena. Dynamic mechanical properties which accurately model the response of materials to impact loading are necessary for such numerical simulations. In this research, the equation of state and failure criteria are measured by plate impact testing, and then the accuracy of these measured dynamic mechanical properties is evaluated based on numerical simulation results. Followings are useful information obtained. (1) The equation of state and failure criteria measured by plate impact testing are sufficiently accurate for numerical simulations. (2) Pure W which is the brittle metal, follows stress-dependent failure criterion. (3) W-Ni-Fe alloys which are the ductile metals, follow time-dependent failure criterion. (4) W-Ni-Fe alloy has the lower critical value for spall failure than its matrix phase. (5) The failure strains of W-Ni-Fe alloys depend on the state of stress.