Fatigue property enhancement by Fine Particle Shot Peening for Aircraft Aluminum Parts
Fatigue property enhancement by Fine Particle Shot Peening for Aircraft Aluminum Parts
复制标题
通过细颗粒喷丸强化飞机铝部件的疲劳性能
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Xiang Xu
中科院分区：
文献类型：
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作者：
Zhigang Liu;Y. Xiong;Ningjing Yang;Lele Ren;Yan Liu;Shijie Zhang;Zhedian Zhang;Xiang Xu
在日本汽车工业中开发的用于钢部件的细颗粒喷丸（FPSP）能够比常规喷丸（SP）更大地改善疲劳性能。适合飞机铝合金零件的FPSP工艺正在开发中。7050T7451铝合金经常规喷丸处理后，其疲劳寿命提高了数倍，而经细颗粒喷丸处理后，其疲劳寿命提高了十倍以上。均匀韧窝充分覆盖的细颗粒喷丸表面的残余压应力高于喷丸表面。断口观察表明，细颗粒喷丸试样的疲劳裂纹起源于次表层，表明近表面处较高的残余压应力和表面粗糙度较低阻止了裂纹从表面萌生。疲劳裂纹萌生于表面的小缺陷和小搭接处。
Fine Particle Shot Peening (FPSP), which has been developed in the Japanese automobile industry for steel parts, enables to improve fatigue property much more than the conventional Shot Peening (SP). The suitable FPSP process for the aluminum aircraft parts is under development. Fatigue life of conventional shot peened 7050T7451 aluminum parts was increased by several times, while that of fine particle shot peened aluminum was increased by more than ten times compared with that of as machined. Compressive residual stress on fine particle shot peened surface which was covered with uniform dimples adequately is higher than that on shot peened surface. Fracture surface observation revealed that the fatigue crack of fine particle shot peened samples originate at the subsurface layer, which shows the high compressive residual stress at very near the surface and less roughened surface prevent crack initiation from the surface. Then FPSP can improve fatigue life farther more than SP does, which shows fatigue crack initiates from a small flaws and laps on the surface created by SP.