Dynamic response of Tungsten-nickel-iron composites under impact loadings

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 ∼10,000/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.