液固高速撞击下材料损伤机制的数值和实验研究  

Numerical and Experimental Study on Mechanism of Material Damage by High Speed Liquid-solid Impact

作　　者：谢永慧[1] 汪勇[1] 陈建辉[1] 张荻[1] 

机构地区：[1]动力工程多相流国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《中国电机工程学报》2009年第35期109-118,共10页Proceedings of the CSEE

基　　金：国家高技术研究发展计划项目(863计划)(2009AA04Z102);教育部新世纪优秀人才支持计划(NCET-07-0682)~~

摘　　要：为了进一步掌握液固高速撞击造成材料损伤的机制,从数值分析和实验两方面进行了研究。对国内外液固高速撞击的研究状况进行综述,建立有限元与光滑粒子动力学耦合数值模型,并且搭建了液固高速撞击试验装置。数值分析有机玻璃和钢材在液滴打击下的状况,获得了液滴撞击下材料内部的应力应变过程;试验中利用高速数码摄影系统得到了撞击时的射流速度,采用三维超景深数码显微系统对高达600m/s的射流撞击钢材时产生的表面损伤进行了研究,得到三维凹坑深度及尺寸数据,对比表明数值分析得到的凹坑深度与实验数据吻合较好,证明了数值模型的可行性和精确性。In order to obtain the mechanism of material failure caused by high speed liquid droplet impact, numerical and experimental study were carried out. A review of the research situation in liquid-solid impact was made, and then a numerical. Model has been developed using finite element method-smoothed particle hydrodynamics coupled method. Meanwhile, an experimental apparatus for studying liquid-solid impact was build. The dynamic stress/strain response of polymethylmethacrylate glass and steel impacted by high speed liquid droplet were studied. The high speed digital vidicon was used to get the liquid droplet impact speed. Surface damage caused by liquid droplet with speed over 600m/s was investigated using three dimensional digital microscope. The depth of pits caused by liquid droplet impact was measured, and it shows good agreement between numerical result and measurement data, so the numerical model used here is usable and accurate.

关 键 词：液滴 流固耦合 光滑粒子流体动力学 高速碰撞 表面损伤 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]