靶体结构对前混合水射流喷丸强化应力特性的影响

Effect of target structure on stress characteristics of premixed water jet shot peening

为研究靶体结构对前混合水射流喷丸强化应力特性的影响,选择工程中最常用的典型零件结构平面、凸面、凹面靶体,采用ABAQUS软件数值模拟弹丸速度和粒径对靶体喷丸效果的影响,弹丸材料为玻璃球,靶体材料为2A11铝合金,计算方法选择显式时间积分。结果表明:弹丸冲击在三种靶体上产生的残余应力变化规律相同,靶体表面均产生残余压应力,靶体表层一定深度处均产生最大残余压应力,且最大残余压应力与弹丸速度和粒径呈正比;在弹丸速度相同和给定的曲率半径条件下,弹丸冲击在靶体上产生的最大残余压应力凹面靶体最大、平面靶体次之、凸面靶体最小,但凹面和平面靶体的最大残余压应力相差很小;当弹丸粒径为0.03 mm、速度为140 m/s时,平面、凸面、凹面靶体上产生的最大残余压应力分别为-524、-440和-527 MPa。

This paper aims to study the influence of the target structure on the stress characteristics of premixed water jet shot peening.The study consists of selecting typical part structures including plane,convex and concave as the targets mostly used in engineering;using ABAQUS software to simulate the projectile velocity and particle size for the effects on the target shot peening;selecting glass ball as the projectile material,2A11 aluminum alloy as the target material,and explicit time integration as the calculation method.The results show that there is the same change rule of residual stress generated by projectile impact on three kinds of targets.Residual compressive stress is generated on the surface of the target,and the maximum residual compressive stress is generated at a certain depth on the surface of the target,and the maximum residual compressive stress is proportional to the velocity of the projectile and the diameter of the projectile;under the condition of the same projectile velocity with the curvature radius given,the maximum residual compressive stress generated by the projectile impact on the target is largest for concave targets,followed by planar targets,and smallest for convex targets,but the difference between the utmost residual compressive stress of concave and planar targets is very small;when the projectile particle size is 0.03 mm,and the velocity is 140 m/s,the maximum of residual compressive stress generated on the plane,convex and concave targets is-524,-440 and-527 MPa,respectively.