Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 47, Issue -, Pages 292-299Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2012.09.010
Keywords
Laser peening; Fatigue crack growth rate; Fracture; Fatigue striation; Coverage area
Funding
- National Natural Science Foundation of China [51175236, 51105179]
- Natural Science Foundation of Jiangsu Province [BK2010351, BK2011478]
- Natural Science Foundation of Jiangsu Higher Education Institutions [10KJB460002]
- Key Laboratory Foundation of Photon Manufacturing Science and Technology of Jiangsu Province [GZ201107]
- Innovation Program of Graduated Student of Jiangsu University [CX09B_07XZ]
- Industrial Technology Support Project of Zhenjiang [SGY20090026]
- PAPD of Jiangsu Higher Education Institutions
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The effects of coverage area on fatigue crack growth (FCG) properties of 6061-T6 aluminum alloy subject to multiple laser peening (LP) impacts were investigated. Residual stress, micro-structure and fatigue striation pattern on fracture cross-sections were analyzed. Compressive residual stresses and dense dislocation arrangements can be found in the superficial layer after LP. LP coverage area has a direct influence on FCG properties as verified by different size of shell ridges and fatigue striation spacing on fracture cross-sections. Meanwhile, FCG rate decreases with the increase of compressive residual stresses distribution perpendicular to the crack growth direction in the initial FCG stage. (C) 2012 Elsevier Ltd. All rights reserved.
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