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Title: Relationship Between Coverage and Surface Residual Stress
Author: D. Kirk and R. C. Hollyoak
Source: Conf Proc: ICSP-9 (pg 373-378)
Publication year 2005
Document number: 2005112
Number of pages: 6
Abstract:
ABSTRACT
Controlled, uniform, peening has been used to impose precise coverage percentages onto mild steel plate specimens. This was achieved by using an X-Y table to move the
specimens under a single, precision-loaded, 2mm diameter indenter. X-ray studies have revealed a surprising relationship between percentage coverage and surface residual
stress. Stress increases almost linearly with low coverages but reaches a maximum at about 80% coverage. At 100% coverage the induced compressive surface residual stress is
about 20% lower than at the maximum. The as-received steel plate contained a low level of tensile surface residual stress. The maximum surface stress of about -350MPa is
well above the tensile test yield strength for mild steel. Traverses were carried out at 90° to one edge of rectangular peened regions and to rows of overlapping
indentations. It was found that compressive surface residual stress extends well into the unpeened regions. A model is presented to explain the character of the observed
surface stress profiles.
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