基于SPH-FEM的超声珩磨空化微射流冲击研究

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摘要为探究超声珩磨中空化微射流对壁面的冲击作用，考虑壁面弹塑性变形、超声场及珩磨压场，采用SPH-FEM耦合方法建立了空化微射流冲击模型并进行了数值仿真分析，随后进行了试验验证，结果表明：微射流冲击过程中形成的侧向射流速度高于微射流冲击速度，最高可达冲击速度的1.6倍，冲击中后期微射流中部粒子反向运动向上凸起；壁面出现直径约8 μm、深约0.173 μm的微型凹坑，且其边缘处有材料塑性隆起，试验中材料表面出现微型凹坑群；冲击区域内由内而外等效应力先升高后降低，射流边缘附近冲击效应最强。从材料去除角度来看，大量微射流冲击对超声珩磨加工起到积极作用。

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	叶林征
	祝锡晶
	王建青
	郭策

关键词 ：流体力学, 微射流冲击, 光滑粒子流体动力学, 超声珩磨, 声空化

Abstract：To explore the effect of cavitation micro-jet impinging on the wall in ultrasonic honing, considering the elastic-plastic deformation of the wall, ultrasonic field and honing pressure field, the SPH-FEM coupled method was used to establish the model of cavitation micro jet impact and for numerical simulation, then an experiment validation was conducted, the results show: the speed of lateral jet formed in the process of micro-jet impact is higher than the impact velocity of micro-jet, up to 1.6 times, the central particles of micro-jet are reverse movement and upward bulge, a micro pit of diameter about 8 μm, depth about 0.173 μm appears on the wall, and material plastically uplift at the edge, micro dimple clusters arise on the material surface in the test; the equivalent stress first rises then reduces inside out within the impact area, the impact effect is the strongest near the edge of the jet. A large number of micro-jet impinging plays a positive role in the ultrasonic honing, from the perspective of material removal.

Key words： fluid mechanics micro-jet impact Smoothed Particle Hydrodynamics ultrasonic honing acoustic cavitation

收稿日期: 2015-10-20 出版日期: 2016-06-25

引用本文:

叶林征，祝锡晶，王建青，郭策. 基于SPH-FEM的超声珩磨空化微射流冲击研究[J]. 振动与冲击, 2016, 35(13): 72-77.
YE Lin-zheng, ZHU Xi-jing, WANG Jian-qing, GUO Ce. Study of cavitation micro-jet impact in ultrasonic honing based on SPH-FEM. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(13): 72-77.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2016/V35/I13/72

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