由于在测量高压下金属粘性的实验中不同测量方法得到的粘性系数值存在很大的系统偏差,所以提出和完善实验方法、获得更多可靠的实验数据显得非常必要。通过改进飞片碰撞的实验技术,在101 GPa压力下测量了铝样品中冲击波前沿上正弦形小扰动的振幅衰减和反向振荡现象,借助Miller和Ahrens对非理想初始流场的解析解,求得铝在此压力下的剪切粘性系数约为800 Pa.s。
Because there are great systematic deviations in viscosity coefficients at high pressure when measured by different experiment techniques,it is necessary to improve the experiment technique and obtain more reliable experiment data.In this paper,by the method of improvement on flyer-impact technique,the oscillatory damping and reverse-phase oscillation process on sinusoidally small-perturbed shock front of aluminum at 101 GPa is detected.The shear viscosity coefficient is deduced to be about 800 Pa·s based o...