| 摘要: |
| 微粒喷丸作为一种新兴的喷丸工艺，由于工艺试验数据与仿真技术的缺失，其作用机理尚未探明。基于 ABAQUS 二次开发，采用离散元与有限元(DEM-FEM)相结合的方法，构建考虑初始残余应力与硬化层梯度的随机多弹丸微粒喷丸弹塑性模型，探究微粒喷丸的喷射速度与覆盖率对残余应力分布和表面粗糙度的影响规律。发现随着微粒喷丸喷射速度的增加， 靶体表面粗糙度的算术平均偏差 Sa 线性增加；覆盖率达到 100%后，覆盖率大小对 Sa 与残余压应力分布影响不大；喷射速度对于微粒喷丸的最大残余压应力值影响不大，但对残余应力层的厚度有显著影响。通过 DEM-FEM 耦合方法对微粒喷丸机理进行探究，为工艺参数的制定提供理论支撑。 |
| 关键词: 微粒喷丸 离散元 覆盖率 残余应力 表面粗糙度 |
| DOI：10.11933/j.issn.1007-9289.20211126001 |
| 分类号:TG17 |
| 基金项目:中央高校基本科研业务费资助项目(2021CDJCGJ003) |
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| Simulation Analysis of Micro-shot Peening Based on DEM-FEM Method |
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Zhang Boyu1, Liu Huaiju1, Wei Peitang1, Zhu Jiazan2
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1.State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044 , China;2.Sichuan Gas Tubine Establishment, Aero Engine Corporation of China, Chengdu 610500 , China
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| Abstract: |
| Micro-shot peening, as a special shot peening process, has the unclear mechanism due to the lack of experimental data and simulation technology. The micro-shot peening elastic-plastic model is developed by combining the discrete element method (DEM) with the finite element method (FEM) in ABAQUS. The initial residual stress and hardened layer gradient are considered to simulate the gear material state before micro-shot peening process. The effects of peening velocity and coverage rate on residual stress distribution and surface roughness are investigated. It is found that the arithmetic mean deviation Sa of the gear surface roughness increases linearly with the increase of the peening velocity. When the coverage rate reaches 100%, the coverage rate has little effect on Sa and residual compressive stress distribution. The peening velocity has little effect on the maximum value of residual compressive stress, while has significant effect on the thickness of the residual stress layer. This paper explores the mechanism of micro-shot peening by DEM-FEM method and provides theoretical support for preparation of micro-shot peening process. |
| Key words: micro-shot peening discrete element method coverage rate residual stress surface roughness |
