摘要
用自行研制的激光冲击强化处理 (LSP)装置对两种重要航空铝合金结构材料 70 5 0T74 5 1,70 5 0T74 5 2冲击强化试验 ,进行了疲劳寿命对比试验。给出了反映疲劳应力水平与结构件寿命对应关系的σm N曲线。结果表明 ,在6 7 3MPa的加载应力水平下 ,激光冲击处理后 70 5 0T74 5 1结构材料的疲劳寿命提高到未经处理的 4 35 % ,而70 5 0T74 5 2在 81 4MPa的应力水平下提高到 5 18%。并对试件进行了激光冲击处理机理的研究 。
Strengthening the important aerial aluminum alloy material, 7050T7451, 7050T7452 by laser shock processing (LSP) technique with the home made device. Testing the fatigue life. σ_m-N curves which show the relation of fatigue stress level and fatigue life of material were given, the result showing, after LSP, fatigue life of 7050T7451 increases to 435% of non LSP sample under 67.3 MPa stress level, fatigue life of 7050T7452 increases to 518% of non LSP sample under 81.4 stress level. Also researching the mechanism of LSP on 7050 aerial A-alloy, the result shows the surface of the test piece has biggish residual compressive stress, and biggish internal dislocation density.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2004年第1期125-128,共4页
Chinese Journal of Lasers
