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Title: The Development of Residual Stresses and Curvature in Mild Steel by Needle Peening
Author: David Kirk
Source: Conf Proc: ICSP-6, (p.312-319)
Publication year 1996
Document number: 1996079
Number of pages: 8
Abstract:
This study has involved a bench-mounted, air driven, needle gun with 2 mm diameter flat-ended needles, to apply controlled peening to 3 mm and 6 mm thick mild steel
specimens. The induced curvature increased with both air pressure and peening time. Radii of curvature approaching 400 mm and 1600mm were abtained for the 3 mm and 6 mm
thicknesses respectively. Needle peening also induced substantial levels of compressive surface residual stress (-200 MPa) but not as high asd those induced by shot peening
of the same material (-251 MPa). It has been concluded that needle peening could have useful commercial applications for both residual stress development and peen forming.
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