Experimental and numerical studies of fatigue behavior of Ti6Al4V alloy treated by laser shock peening

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外文摘要：© 2022 Elsevier B.V.Laser shock peening (LSP) is applied as the laser surface treatment technology to improve the fatigue resistance of aircraft parts with complex geometric features. In this paper, the effects of laser energy inputs on residual stresses and fatigue properties for hole-structured specimens of Ti6Al4V alloy treated by LSP are studied. Changes of residual stress distributions, fatigue behaviors and fracture morphologies are analyzed with different laser-induced shock pressures. The results show the fatigue life is prolonged by 137% compared with the untreated specimens due to the introduction of compressive residual stresses. The sectional observations of fatigue fracture morphology show the inwards movement of fatigue crack initiation positions and the complexity of fracture cracks after LSP treatment. The simulation results confirm that the fatigue life with different laser energy inputs depends strongly on the three-dimensional stress distribution around the hole. Among them, high surface compressive stresses and deep stress affected layers play a decisive role in improving fatigue life. The results in this study broaden the knowledge of fatigue behavior and explore engineering potentials of improved fatigue life for complex industrial specimens.

外文关键词：

Fatigue life predictionFinite element analysisLaser shock peeningResidual stressTi6Al4V alloy

作者：

Zhang H.、Cai Z.、Guo W.、Zhang Y.、Yan J.、He G.、Sun R.、Che Z.

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作者单位：

School of Mechanical Engineering and Automation Beihang University

School of Materials Science and Engineering Jilin University

State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua University

Science and Technology on Power Beam Processes Laboratory AVIC Manufacturing Institute

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出版年：

2022

DOI：

10.1016/j.surfcoat.2022.128524

Surface & Coatings Technology

ISTP

ISSN：0257-8972

年,卷(期)：2022.441

参考文献量33