Determination of the Yield Strength of 93W Alloys by Using AC Techniques

Contrary to the ordinary plate impact experiments which only gives the uniaxial response of the material under shock loading, this study uses the general plate impact technique but a new data processing method, and give us some information about the strength of the material being impacted. Multiple flyer impact technique is used in this experiment in order to generate the loading-reloading or loading-unloading process in a tungsten alloy (93W). VISAR (Velocity Interferometer System for Any Reflector) technique is used to get the particle velocity-time profile at the sample/window interface. From the shock-reshock or shock release particle velocity-time profile obtained from the experiments, and using a self-consistence data processing technique developed in the research, we obtained the strength of the tungsten alloy at 11 GPa, 32 GPa and 96 GPa, which is 1.8 GPa, 2.6 GPa and 4.9 GPa respectively. Based on which we find that although the yield strength of 93W increases as the shock pressure increases, but the ratio of the yield strength to the shock pressure decreases.