论文部分内容阅读
激光喷丸强化技术是一种新型的材料表面改性技术相比于传统喷丸强化技术,具有明显的优势。采用试验与有限元分析相结合的方法,探讨了在一定冲击顺序下,多点激光喷丸强化处理后紧固孔周围残余应力的分布情况。结果表明,通过多个直径为2.6mm光斑的组合能形成一个直径近似为6mm的较大圆形冲击区域,可用来替代大直径光斑进行冲击强化。在多点激光喷丸强化过程中,由于多个光斑叠加,导致冲击区域的表面残余压应力幅值由第一点冲击后的134 MPa增加到冲击结束后的254 MPa,冲击区域变形深度也逐渐增大到26.6μm。在冲击区域钻孔后,紧固孔孔口边缘处的最大残余压应力值明显减小。模拟值与实验值吻合较好。
Laser shot peening technology is a new material surface modification technology compared to the traditional shot peening technology, has obvious advantages. By means of the combination of experimental and finite element analysis, the distribution of residual stress around the fastening hole after multi-point laser shot peening was investigated under certain impact sequence. The results show that a large circle impact area with a diameter of approximately 6 mm can be formed by a combination of a plurality of light spots with a diameter of 2.6 mm and can be used to perform impact strengthening instead of large-diameter light spots. In the process of multi-point laser shot peening, the surface residual compressive stress amplitude increases from 134 MPa at the first impact point to 254 MPa at the impact end due to the superimposition of multiple light spots, and the deformation depth of the impact zone gradually decreases Increased to 26.6μm. After drilling in the impact zone, the maximum residual compressive stress at the edge of the fastening hole orifice is significantly reduced. The simulated value is in good agreement with the experimental value.