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Fatigue life recovery via laser shock peening in mechanically damaged aluminium sheet; experiments and prediction models

Smyth, Niall and Irving, Philip E. (2014). Fatigue life recovery via laser shock peening in mechanically damaged aluminium sheet; experiments and prediction models. In: Advanced Materials Research, 891-892 pp. 980–985.

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URL: http://www.scientific.net/AMR.891-892.980
DOI (Digital Object Identifier) Link: https://doi.org/10.4028/www.scientific.net/AMR.891-892.980
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Abstract

This paper reports the effectiveness of residual stress fields induced by laser shock peening (LSP) to recover pristine fatigue life. Scratches 50 and 150 μm deep with 5 μm root radii were introduced into samples of 2024-T351 aluminium sheet 2 mm thick using a diamond tipped tool. LSP was applied along the scratch in a band 5 mm wide. Residual stress fields induced were measured using incremental hole drilling. Compressive residual stress at the surface was-78 MPa increasing to-204 MPa at a depth of 220 μm. Fatigue tests were performed on peened, unpeened, pristine and scribed samples. Scratches reduced fatigue lives by factors up to 22 and LSP restored 74% of pristine life. Unpeened samples fractured at the scratches however peened samples did not fracture at the scratches but instead on the untreated rear face of the samples. Crack initiation still occurred at the root of the scribes on or close to the first load cycle in both peened and unpeened samples. In peened samples the crack at the root of the scribe did not progress to failure, suggesting that residual stress did not affect initiation behaviour but instead FCGR. A residual stress model is presented to predict crack behaviour in peened samples.

Item Type: Conference or Workshop Item
Copyright Holders: 2014 Trans Tech Publications
ISSN: 1022-6680
Extra Information: Chapter XXI. Laser Shock Peening
Edited by Graham Clark and Chun H. Wang
Keywords: laser shock peening; mechanical scratch damage; scribe; 2024-T351 aluminium sheet; fatigue
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 40404
Depositing User: Niall Smyth
Date Deposited: 16 Jun 2014 10:08
Last Modified: 28 Nov 2016 18:25
URI: http://oro.open.ac.uk/id/eprint/40404
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