摘要
为探求功率超声珩磨中空化作用产生的微射流对壁面的冲击作用,考虑液体压缩性,基于连续方程及动量方程,建立了壁面峰值压力及滞止压力公式。应用耦合欧拉拉格朗日(CEL)方法建立了微射流冲击壁面的有限元模型,并对壁面压力、壁面变形等进行了数值研究。结果表明:壁面的峰值压力、最大变形深度及最大等效应变均出现在射流冲击的边缘;铝板在微射流冲击后出现深约0.11μm的凹坑,并在凹坑边缘有材料隆起;壁面塑性变形主要发生在冲击前期,等效应变呈环形分布。空化微射流的冲击有利于材料的去除。
To explore the impacts of micro-jet on the wall generated by cavitation in the power ul- trasonic boning, liquid compressibility was considered, the peak pressure and stagnation pressure for- mulas of the wall were established based on the continuity and momentum equations. CEL method was applied to establish the finite element model of micro-jet impinging wall, and the wall pressure and wall deformation were numerically studied. The results are： the peak pressure, maximum de- formation depth and maximum equivalent strain of the wall all appear at the edge of the jet impingement; a about 0.11μm deep pit appears on the aluminum plate after impacted by the micro-jet, and material uplift at the edge of the pit~ wall plastic deformation occurs mainly at the early stage of the impact, and the equivalent strain distribution presents in a ring. The impact of the cavitation micro-jet is advantageous to the material removal.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2015年第21期2890-2894,共5页
China Mechanical Engineering
基金
国家自然科学基金资助项目(51275490)
