In this study, a two-dimensional model according to the microcutting mechanism of abrasive particle was developed to demonstrate the mechanics of surface formation of the abrasive air jet polishing (AAJP) of aluminum alloy using amino thermosetting plastic (ATP) abrasive. It is shown that due to the characteristics of medium hardness and angular shape of ATP particle, the impacted surface can be generated by particle sliding, ploughing, microcutting, and indentation with the impinging angle increasing from 0º to 90º. Moreover, the effects of particle impacting on the surface microstructural characteristics, especially residual stress, have been analyzed. It has been found that, compared with particle ploughing and sliding processes, particle microcutting and indentation processes have an obvious effect on the surface residual stress; furthermore, particle microcutting process that can cause the impacted surface with high material deformation and ductility is more beneficial for improving the compressive residual stress than particle indentation process. The results of the study are expected to be applied to improve the fatigue performance of integral and large aircraft structures made of aluminum alloy or other metal materials.

在这项研究中，根据磨料颗粒的微观切割机理建立了二维模型，以说明使用氨基热固性塑料（ATP）磨料对铝合金进行磨料喷气抛光（AAJP）的表面形成机理。结果表明，由于ATP颗粒具有中等硬度和棱角形状的特性，可以通过将颗粒的滑动，耕作，微切割和压痕（冲击角从0º增大到90º）生成受冲击的表面。此外，已经分析了颗粒对表面微结构特征，特别是残余应力的影响。已经发现，与颗粒犁和滑动过程相比，颗粒的微切割和压痕过程对表面残余应力有明显的影响。此外，与颗粒压痕工艺相比，可以使受冲击的表面具有较高的材料变形和延展性的颗粒微切割工艺比压痕工艺更有利于改善压缩残余应力。研究结果有望用于改善铝合金或其他金属材料制成的整体和大型飞机结构的疲劳性能。