RT Journal Article
T1 Effect of laser shock peening on residual stress and fatigue life of clad 2024 aluminium sheet containing scribe defects
A1 Dorman, M.
A1 Toparli, M.B.
A1 Smyth, N.
A1 Cini, Andrea
A1 Fitzpatrick, M.E.
A1 Irving, P.E.
AB Laser peening at a range of power densities has been applied to 2 mm-thick sheets of 2024 T351 aluminium. The induced residual stress field was measured using incremental hole drilling and synchrotron X-ray diffraction techniques. Fatigue samples were subjected to identical laser peening treatments followed by scribing at the peen location to introduce stress concentrations, after which they were fatigue tested. The residual stresses were found to be non-biaxial: orthogonal to the peen line they were tensile at the surface, moving into the desired compression with increased depth. Regions of peen spot overlap were associated with large compression strains; the centre of the peen spot remaining tensile. Fatigue lives showed moderate improvement over the life of unpeened samples for 50 mum deep scribes, and slight improvement for samples with 150 mum scribes. Use of the residual stress intensity Kresid approach to calculate fatigue life improvement arising from peening was unsuccessful at predicting the relative effects of the different peening treatments. Possible reasons for this are explored.
PB Elsevier
SN 0921-5093
YR 2012
FD 2012-06-30
LK https://hdl.handle.net/10016/39948
UL https://hdl.handle.net/10016/39948
LA eng
NO Synchrotron X-ray diffraction experiments were performed at the European synchrotron radiation facility, Grenoble, and we are grateful for the assistance of Dr Alex Evans on beam line ID31. Murat Acar is thanked for help with the experimental execution. Peening treatment was performed by MIC Ltd. MEF is supported by a grant through The Open University from The Lloyd's Register Educational Trust, an independent charity working to achieve advances in transportation, science, engineering and technology education, training and research worldwide for the benefit of all.
DS e-Archivo
RD 18 jul. 2024