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Title: Effects Of Shot Peening On Fatigue-damaged High Strength Aluminum Alloy-appl.of Rejuvenation On Fatigue-damaged Components
Author: Oshida, Yoshiki and Daly, James
Source: Conf Proc: ICSP-4, (p.317-326)
Publication year 1990
Document number: 1990030
Number of pages: 10
Abstract:
It is well established that the shot peening can prolong the fatigue lives and enhance the fatigue strengths as well. Many components and equipment operating currently were
not shot peened at their initial installation. If the x-ray fatigue damage assessment method (previously reported by Y.O.) is applied to such components, one can estimate
extent they are fatigue damaged. Extending the remaining fatigue lives of these existing components will be one of the most interesting demands among industry engineers.
Therefore, it is the objective of the present study (i) to find effects of shot peening on fatigue damaged high strength aluminum alloy for rejuvenating fatigue-damaged
materials, and (ii) to study the rejuvenating mechanisms by x-ray diffraction parameters including dislocation densities through the diffraction line analyses and residual
stress development.
R
ejuvenating factor, newly proposed in this study, can be defined as
N(sp)(f)/N(up)(f) where N(sp)(f) is the number of cycles-to-failure of shot-peened pre-fatigued condition and N(up)(f) is N(f) of un-peened non-damaged condition of the
material. It was found that the remaining fatigue life can be prolonged to N(sp)(f) [N(f) of shot-peened but un-fatigued condition] if 50% or less of the N(up)(f) has been
consumed during the previous fatigue stressing of un-peened condition.
Descriptors: A1 7050-T7651, Pre-fatigue stressing; Four-point reversed bending fatigue test, Shot-peening; Rejuvenating factor; Residual stress; Surface and interior
dislocation densities; Dislocation density ratio
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