冲击压力及加载速率对沟槽微射流的影响

Effect of Pressure and Shock Wave Risetime on Material Ejection

通过二维弹塑性流体力学欧拉程序MEPH,系统研究冲击压力及加载速率对沟槽微射流喷射量的影响.计算结果显示,微射流的喷射量随冲击压力的增大而增大,但喷射量对压力的变化并不敏感;计算结果和实验结果均表明,加载速率对沟槽微射流的喷射量有较大影响,随着加载速率的减小,微粒子喷射量大致按指数规律减少,所得数值计算结果得到实验验证.

A two-dimensional elastic and plastic hydrodynamics code MEPH is applied to simulate ejecting process. We focus on the effect of shock pressure and shock risetime on mass ejection from shocked aluminum. It shows that with increase of shock pressure the ejecting factor keeps increasing, but the ejecting factor is not sensitive to the shock pressure. The effect of shock risetime on the mass ejection from shocked aluminum is also investigated. Numerical results agree well with experiments. The mass ejection is sensitive to shock risetime.