Dynamic Response of Tungsten-nickel-iron Composites under Impact Loadings

Abstract

Plate impact experiments under the high strain rates are conducted to study the dynamic behavior of 91W-6.3Ni-2.7Fe alloys. The Lagrangian analysis is adopted to analyze the mechanical properties of the tungsten alloys and determine their stress-strain curves. The influence of grain size on the dynamic behavior of tungsten alloys is studied and the stress-strain curves are measured in a strain rate range of 1,000 ~ 10,0007 s . Based on the experimental observation, an explicit finite element program is suggested to analyze fracture modes of projectile and tungsten alloy target, respectively. A dozen cases are studied numerically to investigate the dynamic mechanical behavior of tungsten alloy target. The fracture modes of the targets at a specific time are obtained. A good agreement between numerical predictions and experimental results suggests that the finite element analysis is effective and useful for analysis of the mechanical properties of tungsten alloys.

Dynamic mechanical characterization and optimization of particle-reinforced W-Ni-Fe composites

“…In the nuclear industry, tungsten alloy is ideal for fuel storage containers and radiation shielding materials. In the civilian industry, tungsten alloy can be produced as mechanical tool handles, mechanical hands, drill bits, etc.Researchers have done a lot of work on the testing technologies, dynamic responses, dynamic failure of materials and micro-mechanism of fracture for W-Ni-Fe composites [2][3][4][5]. Rittel and Weisbrod [6] studied the static and dynamic fracture toughness in three distinct orientations using short beam experiment technique and found that the quasi-static fracture toughness is relatively isotropic and rate insensitive, while the dynamic fracture toughness is markedly anisotropic and rate sensitive.…”