Study on Residual Stress of Big Tilling Depth Rotary Blade for Laser Shock Peening
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摘要: 研究了激光冲击强化对回转半径为350 mm大耕深旋耕刀残余应力的影响，利用ANSYS对旋耕刀进行理论应力分析，发现应力集中在刀柄外弯角处，同时进行了激光冲击强化模拟，得到理论残余应力引入值。利用X射线衍射法对激光冲击强化前后旋耕刀表面进行了残余应力测试。结果表明，ANSYS模拟激光冲击强化引入的残余应力值与试验实测的结果吻合得较好，相比未经处理的旋耕刀，激光冲击强化后刀具表面残余应力明显增大，最大残余压应力达412.25 MPa，增幅达166%，残余压应力的引入可消除旋耕刀工作的应力集中，提高了刀具使用寿命。研究结果为进一步提高和优化大耕深旋耕刀制造工艺提供了新的参考依据。Abstract: The effect of residual stress of big tilling depth rotary blade with 350 mm turning radius for laser shock peening (LSP) was researched, and the theoretical stress of rotary blade were analyzed by ANSYS.The stress concentration region was at the outer corner of tool shank.The LSP process was also simulated by ANSYS and the theoretical introduced value of the residual stress was obtained.Value of residual stress before and after LSP were tested by X-ray stress meter.The results show that the simulation value fits well with the experimental value, and the residual stress after LSP changes effectively with the maximum reaches 412.25 MPa and a amplification of 166%.The introduced residual compressive stress could eliminate the stress concentration of the working rotary blade, and raise its using life.It provides a new basis for further improvement and optimization of big tilling depth rotary blade's manufacture technique.
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图 1 (a) 位移分布等值线图(b)应力分布等值线图
Figure 1. (a) Isoline of displacement distribution (b) Isoline of stress distribution
图 3 (a) 旋耕刀冲击强化前准备(b)残余应力测点位置
Figure 3. (a) The preparation before LSP (b) Residual stress measuring point location
图 4 激光冲击仿真与实测残余应力
Figure 4. Residual stress datum of simulation and experiment after LSP
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