Dynamic strength of tungsten-nickel-cobalt alloys

Tensile Failure of Tungsten Alloys

“…When the traces are integrated to derive stress strain graphs, the resulting curves are concave down. It should be noted that there have been many high-strain rate measurements of yield stress in these alloys in uniaxial stress (see, for example, [3]). The values are Y = 2.2-2.4 GPa.…”

“…Very high-rate tensile failures were also produced in a new transverse impact experiment [3]. This test involves an impact at 2.2-2.4 km/s between a tungsten heavy alloy (WHA) rod and rolled homogeneous armor (RHA) block such that a bending failure is produced in the rod.…”

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“…Further, the material should be available in sizes compatible with carrying multimegampere currents and in multimeter lengths. Persad et al [27] determined that copper-silver alloys show promise since, by thermo-chemical processing, they can achieve high tensile strength (1000 MPa), and silver uniquely does not degrade the conductivity of copper.…”

Evaluation of Tungsten Alloy Rods

“…Morphology differences were observed across the fracture surfaces. These are attributed to the microstructural damage events rather than strain rate differences across the sample as originally interpreted by Satapathy, et al [1] for the dynamic bend samples. The metallurgical findings indicate that the fracture process is more complex than continuous propagation of a surface-initiated, brittle crack.…”

“…-10-TESTING SUMMARY 1. Metallurgical evaluation of dynamic fracture samples, tested at a range of loading rates, revealed W particle-particle decohesion and W particle-matrix decohesion as the primary forms of damage.…”