Analysis of 7050 Aluminum Alloy Crack Growth by Laser Shock Processing

Xu Dong Ren; T. Zhang; Yong Kang Zhang; Da Wei Jiang; Kang Min Chen

doi:10.4028/www.scientific.net/AMR.97-101.3852

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 97-101Analysis of 7050 Aluminum Alloy Crack Growth by...

Analysis of 7050 Aluminum Alloy Crack Growth by Laser Shock Processing

Abstract:

Cracks were prefabricated on compact tension specimen of 7050 Aluminum alloy, which was laser shock processing(LSP) once and three times. The whole crack initiation process, distribution and size evolution on aluminum alloy was studied with replica technique and through optical microscope. It was found that without LSP, small cracks initiated at the grain boundary and grew quickly. The cracks continued growing in depth. The growth of short cracks had the trend of stop-and-go oscillation, the crack data were relatively scattered, and short cracks had short average length and grew earlier. After LSP, surface residual compressive stress restrained to the trend of crack origins where crack origins would form most easily; after origination, cracks initiated towards the processed region, but stop temporarily if encountering great resistance, and might generate additional crack origins; Moreover, the higher the level of stress created by LSP was, the fewer cracks initiated.

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Periodical:

Advanced Materials Research (Volumes 97-101)

Pages:

3852-3856

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.97-101.3852

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Online since:

March 2010

Authors:

Xu Dong Ren, T. Zhang, Yong Kang Zhang, Da Wei Jiang, Kang Min Chen

Keywords:

7050 Aluminium Alloy, Crack Growth Speed, Fatigue Crack, Laser Shock Processing (LSP)

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