论文部分内容阅读
采用波长为1064 nm,脉冲宽度为23 ns,光斑半径为5 mm,单次脉冲能量为40 J的激光对渐开线直齿圆柱轮齿齿面进行了激光冲击强化处理,并借助ANSYS/LS-DYNA软件模拟了残余应力场的形成过程;随后运用有限元方法研究了激光脉冲参数对轮齿根部残余应力的影响。结果表明,激光冲击强化后,在轮齿表面及深度方向上通过数值模拟获得的残余应力与实验测量值得到了较好的吻合;对轮齿齿根进行激光冲击强化时,选用脉宽为25 ns、高斯波形的激光加载能够获得较理想的残余应力分布;同时激光冲击强化对圆角半径较小的齿根效果更明显。
The tooth surface of involute spur cylindrical gear was laser shock strengthened with a laser beam with a wavelength of 1064 nm, a pulse width of 23 ns, a spot radius of 5 mm and a single pulse energy of 40 J. With ANSYS / LS -DYNA software to simulate the formation of residual stress field; and then use the finite element method to study the influence of laser pulse parameters on the root residual stress. The results show that the residual stress obtained by numerical simulation on the tooth surface and in the depth direction is in good agreement with the experimental measurement after laser shock strengthening. When the laser shock is applied to the tooth root, the pulse width is 25 ns Gaussian waveform laser loading can obtain a more ideal residual stress distribution; at the same time, laser shock strengthening has a more obvious effect on the tooth root with a smaller radius.