双屈服法测定93W合金的屈服强度

 用组合飞片技术以实现对待测材料93W合金进行加载-再加载和加载-卸载，并用VISAR（Velocity Interferometer System for Any Reflector）测试方法和高速数值示波器记录样品-窗口界面的粒子速度，通过上下屈服面法对实验数据进行处理，从而推出93W在冲击压力分别为16、32和96 GPa三个压力点下的屈服强度为：1.8、2.6和4.9 GPa。得到了93W合金在高压下材料屈服强度随冲击压力的增大而增大，但其与冲击压力的比值则随冲击压力的增加而减小的变化规律。

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 11GPa,32GPa and 96GPa,which is 1.8GPa,2.6GPa and 4.9GPa 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.