喷丸
材料科学
残余应力
激光喷丸
休克(循环)
压痕硬度
喷丸
硬化(计算)
疲劳极限
疲劳试验
微观结构
表面粗糙度
复合材料
表层
结构工程
冶金
图层(电子)
工程类
医学
内科学
作者
Rujian Sun,Zhigang Che,Ziwen Cao,Hepeng Zhang,Shikun Zou,Junfeng Wu,Wei Guo
标识
DOI:10.1016/j.engfailanal.2022.106625
摘要
Laser shock peening (LSP) is an advanced surface treatment technique for improving the fatigue properties of various metals. However, its capability in real-engineering-based complex structures is much less reported. In this study, AA2024-T351 with circular holes, which stand for aircraft wing plates connected by bolts, are treated by LSP and then imposed to high cycle fatigue tests. Surface profiles and residual stress evolution are measured on the fatigue specimens. Microhardness, wear, and microstructure analyses are carried out on different peening specimens. Although an increment of roughness caused by periodical plastic deformation is detected on the surface, the LSP introduces a hardening layer containing a large number of dislocations, a surface with higher wear resistance, as well as a compressive residual stress layer. These LSP-induced characteristics significantly enhance the fatigue lives of both types of bolt connections we examined. Finally, the underline strengthening mechanisms are discussed from macroscopic to microscopic.
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