Effect of texture on the residual stress response from laser peening of an aluminium-lithium alloy

S. Zabeen; K. Langer; M. E. Fitzpatrick

doi:10.1016/j.jmatprotec.2017.07.032

Effect of texture on the residual stress response from laser peening of an aluminium-lithium alloy

S. Zabeen, K. Langer, M. E. Fitzpatrick

Faculty of Engineering, Environment & Computing (EEC)

Wright-Patterson Air Force Base

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

107 Downloads (Pure)

Abstract

Laser shock peening can improve the damage tolerance of metallic materials by introducing deep compressive residual stress that inhibits crack initiation and growth. This study investigates the laser peening of aluminium alloy in a product form – an extruded T-section – that has different crystallographic textures in different locations. The alloy studied is Al 2099, an aluminium-lithium alloy that shows anisotropy in the mechanical properties when texture is present. Specimens extracted from different regions of the extrusion were laser shock peened with a power density of 3 GW/cm² in single shocks as well as in a pattern. Residual stresses were characterized primarily using incremental hole drilling. The results show 20% higher residual stresses in the web area of the extrusion compared to the flange after peening with a single laser shock, with this difference decreasing as the number of shocks increases. This effect can be explained by the difference in yield strength between those locations. No significant differences were observed in the residual stresses from peening onto different planes of a textured sample at a given location.

Original language	English
Pages (from-to)	317-329
Number of pages	13
Journal	Journal of Materials Processing Technology
Volume	251
Early online date	31 Jul 2017
DOIs	https://doi.org/10.1016/j.jmatprotec.2017.07.032
Publication status	Published - 1 Jan 2018

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Materials Processing Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Materials Processing Technology, [251, (2017)] DOI: 10.1016/j.jmatprotec.2017.07.032

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

Al 2099
Extrusion
Incremental hole drilling
Laser shock peening (LSP)
Residual stress
Texture

ASJC Scopus subject areas

Ceramics and Composites
Computer Science Applications
Metals and Alloys
Industrial and Manufacturing Engineering

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10.1016/j.jmatprotec.2017.07.032

Post-PrintAccepted author manuscript, 5.14 MBLicence: CC BY-NC-ND

Cite this

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abstract = "Laser shock peening can improve the damage tolerance of metallic materials by introducing deep compressive residual stress that inhibits crack initiation and growth. This study investigates the laser peening of aluminium alloy in a product form – an extruded T-section – that has different crystallographic textures in different locations. The alloy studied is Al 2099, an aluminium-lithium alloy that shows anisotropy in the mechanical properties when texture is present. Specimens extracted from different regions of the extrusion were laser shock peened with a power density of 3 GW/cm2 in single shocks as well as in a pattern. Residual stresses were characterized primarily using incremental hole drilling. The results show 20% higher residual stresses in the web area of the extrusion compared to the flange after peening with a single laser shock, with this difference decreasing as the number of shocks increases. This effect can be explained by the difference in yield strength between those locations. No significant differences were observed in the residual stresses from peening onto different planes of a textured sample at a given location.",

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N2 - Laser shock peening can improve the damage tolerance of metallic materials by introducing deep compressive residual stress that inhibits crack initiation and growth. This study investigates the laser peening of aluminium alloy in a product form – an extruded T-section – that has different crystallographic textures in different locations. The alloy studied is Al 2099, an aluminium-lithium alloy that shows anisotropy in the mechanical properties when texture is present. Specimens extracted from different regions of the extrusion were laser shock peened with a power density of 3 GW/cm2 in single shocks as well as in a pattern. Residual stresses were characterized primarily using incremental hole drilling. The results show 20% higher residual stresses in the web area of the extrusion compared to the flange after peening with a single laser shock, with this difference decreasing as the number of shocks increases. This effect can be explained by the difference in yield strength between those locations. No significant differences were observed in the residual stresses from peening onto different planes of a textured sample at a given location.

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Effect of texture on the residual stress response from laser peening of an aluminium-lithium alloy

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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