纳秒脉冲激光制孔孔壁热应力数值模拟研究  

Numerical Simulation of Thermal Stress in Hole-Wall Fabricated by Nano-Pulse Laser Drilling

作　　者：张修瑞 李怀学[2,3] 黄锐[1] 

机构地区：[1]中航工业成都飞机工业(集团)有限责任公司,成都610092 [2]中航工业北京航空制造工程研究所,北京100024 [3]高能束流加工技术重点实验室,北京100024

出　　处：《航空制造技术》2016年第9期74-78,共5页Aeronautical Manufacturing Technology

摘　　要：通过数值模拟研究纳秒脉冲激光冲击制孔过程孔壁热应力,分析不同脉冲数作用下制孔过程孔壁热应力演变特征,揭示了不同厚度再铸层内应力变化特征。结果表明:随着纳秒脉冲数增加,制孔深度不断增加,孔壁最高温度和最大von Misses等效应力逐步远离激光入孔端,但最大等效塑性应变在激光入孔端;随着再铸层厚度的增加,其内部拉应力不断增大,微裂纹易产生于较厚的孔壁再铸层内。The thermal stress in hole-wall fabricated by nano-pulse laser drilling has been investigated using numerical simulation. The thermal stress evolution characteristics in hole-wall have been revealed with different nano-pulses and the inner stress in re-casted layers with different thicknesses has been analyzed. The results show that the drilling depth becomes bigger, and the maximum temperature and von Misses stress location in hole-walls are moving far away from the laser entrance with nano-pulses increasing, but the maximum equivalent plastic strain exits still in the laser access point. The tensile stress in hole-wall is growing with increasing of the re-casted layer thickness and the micro-cracks usually exist in thicker re-casted layers.

关 键 词：制孔 脉冲激光 热应力 数值模拟 

分 类 号：V261.8[航空宇航科学与技术—航空宇航制造工程]