(1. 江蘇大學(xué) 機(jī)械學(xué)院 光子制造科學(xué)與技術(shù)省重點(diǎn)實(shí)驗室，鎮(zhèn)江 212013；
2. 華東理工大學(xué) 機(jī)械與動力工程學(xué)院，上海 200237)
摘 要: 研究激光加工工藝對Ti6Al4V航空鈦合金葉片表面粗糙度和殘余應(yīng)力的影響，并分析影響表面質(zhì)量的激光加工工藝參數(shù)；探討表面粗糙度和表面殘余應(yīng)力對葉片疲勞壽命的影響。結(jié)果表明，采用激光沖擊航空葉片，葉片表面殘余壓應(yīng)力大大增強(qiáng)，從而使得其抗疲勞破壞能力增強(qiáng)，而表面粗糙度減小；在激光脈沖功率允許的范圍內(nèi)，選擇合適的沖擊參數(shù)能有效降低葉片表面粗糙度，而表面殘余壓應(yīng)力對疲勞壽命的影響起主導(dǎo)作用。
關(guān)鍵字: 激光沖擊；殘余應(yīng)力；表面粗糙度；疲勞壽命
fatigue life of titanium alloy
（1. Jiangsu Key Laboratory of Laser Manufacture Science and Technology Ministry,
Jiangsu University,Zhenjiang 212013, China;
2. School of Mechanical and Power Engineering, East China University of Science and
Technology, Shanghai 200237, China）
Abstract:The influence of laser shock processing on surface residual stress and roughness of the titanium alloy Ti6Al4V during laser shock processing was analyzed, and the effects of the surface residual stress and roughness on aircraft structures fatigue life were investigated by the theory of fracture dynamics. The results show that with the logical parameters of laser shock processing on the aircraft structures, the higher laser power density, the greater compressive residual stress on the surface of the sample is obtained. And the surface roughness could be descent by the correct selecting laser shock parameters. Near the surface, the yield strength is increased by the laser shock, and the compressive residual stress is the main factor to enhance the fatigue life of the titanium alloys.
Key words: laser shock processing; residual stress; surface roughness; fatigue life
