Mapping residual strain induced by cold working and by laser shock peening using neutron transmission spectroscopy

Ranggi S. Ramadhan, Abdul K. Syed, Anton S. Tremsin, Winfried Kockelmann, Robert Dalgliesh, Bo Chen, David Parfitt, Michael E. Fitzpatrick

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)
    64 Downloads (Pure)


    This paper presents 2D mapping of residual strains, induced by cold expansion and laser shock peening processing of aluminium alloy samples, by using Bragg edge neutron transmission. Neutron transmission uses information contained in the neutron beam transmitted through a sample. It is shown that neutron transmission strain mapping with high spatial resolution can provide important insights into the distribution of residual strains associated with processing of materials. The residual strain field around a cold-expanded hole can be revealed in detail, as can be the residual strain profile associated with laser peening. Results are correlated with measurements obtained by conventional neutron diffraction and incremental hole drilling. The residual strain variation around the cold-expanded hole and the depth of compressive residual strain generated by the peening process were captured with high spatial resolution, showing the advantages of neutron transmission over other well-established strain measurement methods by non-destructively generating a map of residual strains over a large area.

    Original languageEnglish
    Pages (from-to)56-64
    Number of pages9
    JournalMaterials and Design
    Early online date31 Jan 2018
    Publication statusPublished - 5 Apr 2018

    Bibliographical note

    NOTICE: this is the author’s version of a work that was accepted for publication in Materials and Design. 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 Materials and Design 143 (2018) DOI: 10.1016/j.matdes.2018.01.054

    © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International


    • Bragg edge analysis
    • Cold expansion
    • Laser shock peening
    • Neutron transmission
    • Residual strain
    • Strain mapping

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering


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