航空学报 > 2022, Vol. 43 Issue (4): 525925-525925   doi: 10.7527/S1000-6893.2021.25925

基于DEM-FEM耦合的超声喷丸强化数值分析

蔡晋1, 闫雪2, 李威1, 孟庆勋1   

  1. 1. 沈阳航空航天大学 航空宇航学院, 沈阳 110136;
    2. 中国航发上海商用航空发动机制造有限责任公司, 上海 201306
  • 收稿日期:2021-06-05 修回日期:2021-06-30 发布日期:2021-09-06
  • 通讯作者: 蔡晋 E-mail:saumax@163.com
  • 基金资助:
    中国航发产学研合作项目(HFZL2019CXY024-1);辽宁省自然科学基金指导计划项目(2019-ZD-0235)

Numerical analysis of ultrasonic shot peening based on DEM-FEM coupling

CAI Jin1, YAN Xue2, LI Wei1, MENG Qingxun1   

  1. 1. College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China;
    2. AECC Shanghai Commercial Aircraft Engine Manufacturing Company, Shanghai 201306, China
  • Received:2021-06-05 Revised:2021-06-30 Published:2021-09-06
  • Supported by:
    Industry University Research Cooperation Project of AECC (HFZL2019CXY024-1); Natural Science Foundation Guidance Plan Project of Liaoning Province (2019-ZD-0235)

摘要: 为了研究超声喷丸处理过程弹丸与构件之间弹塑性接触状态、应力场及表面状态分布规律,基于显式微粒离散函数的多弹丸撞击模型和Hertz-Mindlin (No Slip)碰撞接触力学定律,建立了弹丸冲击速度与恢复系数之间的模型。针对超声喷丸过程,建立DEM-FEM (离散元-有限元)耦合数值模型,建立ALE自适应网格模型,通过数值模拟研究恒定恢复系数与动态恢复系数对构件表面残余应力、残余应力层深度、表面宏观形貌的影响,恒定恢复系数增加的过程中,表面残余压应力、残余压应力层深度、表面粗糙度均增加,相比残余应力层深度与表面粗糙度,表面残余应力分布极值差低约12%,相比残余应力层深度内外端均值差值,表面残余应力与表面粗糙度差值低约9%~15%。结果表明,在恒定与动态恢复系数下,与残余压应力层深度相比,表面残余应力与表面宏观形貌更容易实现均匀性;与恒定恢复系数相比,动态恢复系数对构件表面引入的残余应力与试验结果误差均低于5%,预测更接近真实值。

关键词: 超声喷丸, 离散元, 有限元, 弹性变形, 塑性变形, 恢复系数

Abstract: To study the elasto-plastic contact state and stress field distribution between the projectile and the component during the ultrasonic shot peening process, the multi-projectile impact model based on the display particle dispersion function and the Hertz-Mindlin (No Slip) collision contact mechanics law is used. A model between the impact velocity of the projectile and the coefficient of restitution is established. According to the spherical cavity expansion model, the stress field under the collision of a single projectile is calculated. Aiming at the numerical model of ultrasonic shot peening, DEM-FEM coupling numerical model and ALE adaptive mesh model is established, and the effects of constant coefficient of restitution and dynamic coefficient of restitution on the surface residual stress, residual stress layer depth, and surface macroscopic morphology of the component surface are studied through numerical simulation. The constant recovery coefficient increased in the process, the surface compressive residual stress, the depth of the compressive residual stress and surface roughness are all increased. Compared with the depth of the residual stress layer and the surface roughness, the extreme value of the surface residual stress distribution is about 12% lower than the average value of the inner and outer ends of the residual stress layer depth. The difference between the surface residual stress and the surface roughness is about 9%-15% lower. The results show that under constant and dynamic coefficient of restitution, the surface residual stress and the surface macro morphology are easier to achieve uniformity, compared with the depth of the compressive residual stress layer. And compared with the constant coefficient of restitution, the residual stress introduced by the dynamic coefficient of restitution on the surface of the component and the test results are less than 5%, and the prediction is closer to the true value.

Key words: ultrasonic shot peening, discrete element, finite element, elastic deformation, plastic deformation, coefficient of restitution

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