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Incremental Hole Drilling Residual Stress Measurement in Thin Aluminum Alloy Plates Subjected to Laser Shock Peening

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Abstract

The American standard ASTM E837 presents a standard procedure to determine residual stresses in isotropic materials using the incremental hole drilling technique (IHD). The standard, however, presents limitations regarding its applicability, such as those related with the thin thickness of the samples. According to this standard, in depth non uniform residual stresses can only be determined, roughly, in plates where the thickness is greater than the mean diameter of the strain gage rosette used. This limitation excludes important experimental cases and, therefore, deserves to be investigated. In this work this limitation is numerically and experimentally investigated in detail, considering the case of residual stresses induced by laser shock peening (LSP) in aluminum alloy 7075-T651 plates. The obtained results using the incremental hole drilling technique (IHD), based on the integral method, are benchmarked against the results of several diffraction techniques, used as reference, and a procedure to correct the experimentally determined strain-depth relaxation curves, to accurately still apply the ASTM E837 standard procedure is discussed and validated.

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Acknowledgments

The authors would like to acknowledge the DSI-NRF Centre of Excellence in Strong Materials (CoE-SM) for their financial support. They would also like to acknowledge the vital support of the South African Centre for Scientific and Industrial Research National Laser Centre’s (CSIR NLC) Rental Pool Program (RPP), funded by the Department of Science and Innovation (DSI). In addition, this work is based on the research supported in part by the National Research Foundation (NRF) of South Africa through the Incentive Funding for Rated Researchers (IFRR), Equipment-Related Travel and Training Grant (ERTTG) (Grant Numbers: 109200 and 115195) and under the Competitive Programme for Rated Researchers (Grant Number: 106036). Opinions, findings and conclusions or recommendations expressed in this work are those of the authors and are not necessarily to be attributed to the CoE-SM or to the NRF. Finally a special acknowledge to Dr. Daniel Glaser from CSIR for his precious assistance on LSP technology.

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Correspondence to J. P. Nobre.

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Nobre, J.P., Polese, C. & van Staden, S.N. Incremental Hole Drilling Residual Stress Measurement in Thin Aluminum Alloy Plates Subjected to Laser Shock Peening. Exp Mech (2020). https://doi.org/10.1007/s11340-020-00586-5

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Keywords

  • Residual stress
  • Hole drilling method
  • Thin plates, laser shock peening
  • X-ray diffraction
  • Neutron diffraction
  • Energy dispersive synchrotron X-ray diffraction