基于SPH-FEM的超声珩磨空化微射流冲击研究

叶林征,祝锡晶,王建青,郭 策

振动与冲击 ›› 2016, Vol. 35 ›› Issue (13) : 72-77.

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (13) : 72-77.
论文

基于SPH-FEM的超声珩磨空化微射流冲击研究

  • 叶林征,祝锡晶,王建青,郭 策
作者信息 +

Study of cavitation micro-jet impact in ultrasonic honing based on SPH-FEM

  • YE Lin-zheng, ZHU Xi-jing, WANG Jian-qing, GUO Ce
Author information +
文章历史 +

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。

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.

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

Key words

fluid mechanics / micro-jet impact / Smoothed Particle Hydrodynamics / ultrasonic honing / acoustic cavitation

引用本文

导出引用
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[J]. Journal of Vibration and Shock, 2016, 35(13): 72-77

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