材料动态强度直接测量的磁压剪实验技术及应用

摘要

This paper presents a novel method for directly measuring material strength under dynamic loading,namely the technique of magnetically applied pressure shear (MAPS).The relationship between the stress deviation and the yield strength under MAPS was analyzed theoretically and numerically.The time-space evolutions of the stress deviation and yield strength under MAPS were characterized and calculated.Experiments were conducted based on the CQ-4 and 10 T quasi-static magnetic field generator,both developed by ourselves,using a dual laser heterodyne velocimetry (DLHV),to study the technology of MAPS under ramp wave loadings.The compression strengths of cold rolled pure aluminum and polished pure aluminum under ramp loading were measured and the reliable experimental data were obtained.The results show that the technique of MAPS provides a novel and reliable technique for directly measuring high-pressure strength and can be reliably applied%提出一种用于直接测量动载荷下材料强度的新方法,即磁驱动压剪联合加载实验技术.从理论和数值计算上分析了压/剪联合作用下材料的应力偏量与屈服强度关系,计算斜波加载下压/剪联合作用时应力偏量与屈服强度的时空演化特性,给出材料强度数值的计算方法.并基于自行研制的强脉冲电流装置和10T准静态磁场发生器,利用多点双光源外差位移干涉仪(dual laser heterodyne velocimetry,DLHV),开展磁压剪实验对2种铝样品的动态强度进行测量,得到不同加载压力下铝样品的强度.结果表明:磁驱动压/剪联合加载技术为材料的高压强度直接测量提供了一种新途径,是可靠的实验技术.