Study on the Phenomena of the Mass Ejection from the Free Surface of Aluminum at Different Dynamic Loading Rates
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摘要: 本文主要研究铝自由面微粒子喷射量随压力加载速率的关系，重点是对微射流机制的研究。用人工楔形槽作为自由面上的模拟几何缺陷，用斜波发生器技术改变加载速度，用石英传感器技术测量微粒子喷射量。研究结果表明：在楔形槽尺寸和峰值应力不变的条件下，微粒子喷射量及其最大喷射速度，均随加载速度（加载波阵面宽度的一种度量）的减小而减小；在压力加载条件不变时，发现微粒子喷射量有随几何缺陷体积的增加而增大的迹象。用HELP编码对本实验进行的二维数值模拟结果表明，在数值上与实测数据基本符合。Abstract: The relation between the mass-ejection and the dynamic loading rate has been investigated with emphasis on the micro-jetting mechanism. Artificial wedged-grooves were made as the geometrical defects on the free surface, ramp-wave generator technique was employed to control the rate of dynamic loading, and quartz transducer was used to measure the ejected mass quantitatively. It is found that both the ejected mass and the maximum ejected velocity decrease with decreasing the loading rate if the wedged-groove size and the peak stress are fixed, and there is an indication that the ejected mass decreases with decreasing the geometrical defect volume if the dynamic loading condition, including peak stress and loading rate, is fixed. Using HELP code, we have carried out two-dimensional numerical simulation for the experiments aimed at micro-jetting mechanism study. The numerical results are in good agreement with the measured ones.
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