Measurement of Residual Stresses in Different Thicknesses of Laser Shock Peened Aluminium Alloy Samples

Journal Article · Fri Apr 20 00:00:00 EDT 2018 · Materials Research Proceedings

DOI:https://doi.org/10.21741/9781945291678-18· OSTI ID:1473668

van Staden, Sean N. ^[1]; Polese, Claudia ^[1]; Glaser, Daniel ^[2]; Nobre, Joao-Paulo ^[1]; Venter, Andrew M. ^[3]; Marais, Deon ^[4]; Okasinksi, John ^[5]; Park, Jun-Sang ^[5]

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1. Univ. of the Witwatersrand, Johannesburg (South Africa). School of Mechanical, Industrial and Aeronautical Engineering, and DST-NRF Centre of Excellence in Strong Materials
2. CSIR National Laser Centre, Pretoria (South Africa)
3. Univ. of the Witwatersrand, Johannesburg (South Africa). DST-NRF Centre of Excellence in Strong Materials; Necsa SOC Limited, Pretoria (South Africa). Research and Development Division
4. Necsa SOC Limited, Pretoria (South Africa). Research and Development Division
5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

This study focused on depth-resolved residual stress results determined with a number of complementary techniques on Laser Shock Peening (LSP) treated aluminium alloy 7075-T651 samples with different thicknesses (6 mm and 1.6 mm). Samples were prepared from a single commercially produced rolled plate that was then treated with LSP. Residual stresses were measured using Laboratory X-Ray Diffraction (LXRD), Incremental Hole Drilling (IHD), Neutron Diffraction (ND) and Synchrotron XRD (SXRD). The LSP treatment resulted in the establishment of compressive residual stresses that varied rapidly in the near surface region. The compressive stresses extended up to 1.5 mm in depth in the 6 mm thick sample. Some surface stress relaxation was observed in the first 25 μm, but substantially large stresses existed at 50 mu m. Finally, this investigation strongly motivated why residual stress profiles should be obtained using a variety of techniques.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Research Foundation (NRF) South Africa; USDOE
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1473668
• Journal Information: Materials Research Proceedings, Journal Name: Materials Research Proceedings Vol. 4; ISSN 2474-395X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
aluminium
energy-dispersive
incremental hole drilling
laser shock peening
neutron diffraction
residual stress
synchrotron
x-ray diffraction