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兩種物態(tài)方程在超高速碰撞數(shù)值模擬中的比較

Comparison of two equations of state in numerical simulation of hypervelocity impacts

  • 摘要: 材料在超高速碰撞下將發(fā)生熔化甚至氣化相變。為反映超高速碰撞中材料相變帶來的影響，文章采用GRAY三相物態(tài)方程與Tillotson物態(tài)方程，對超高速碰撞進行數(shù)值模擬對比研究。研究表明：當碰撞速度在3 km/s以下時，除了靶板穿孔直徑外，兩種物態(tài)方程所給出的碎片云的結(jié)果基本一致；但當碰撞速度在3 km/s以上時，兩種物態(tài)方程給出的數(shù)值模擬結(jié)果有較大差異，這說明在超高速碰撞中相變的產(chǎn)生對碎片云形狀參數(shù)有較大影響。

     

    Abstract: Materials may melt and even vaporize under hypervelocity impact. In order to consider the material phase changes under hypervelocity impact, GRAY three-phase equation of state and Tillotson equation of state were applied in this paper, and hypervelocity impact numerical simulation was carried out by using the two equations of state, respectively. The simulation results show that when the impact velocity is under 3 km/s, there are no obvious differences between the debris clouds characteristic parameters except the diameter of penetration holes given by the two equations of state; but when the impact velocity exceeds 3 km/s, there are notable differences between the debris clouds characteristic parameters given by the two equations of state. The results show that the material phase changes under hypervelocity impact have significant influence on the debris clouds characteristic parameters.

     

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