Abstract
An effective method for improving the fatigue life of Duralumin plates with fastener holes, such as those used in the construction of aircraft, is to introduce a compressive residual stress around the fastener holes. Cavitation peening is a novel peening method that uses the cavitation impact produced when a high-speed water jet is injected into a water-filled chamber. In this paper, Duralumin plate specimens with holes were treated by cavitation peening under various conditions, and the fatigue strength of the specimens was determined using a plate bending fatigue test. It was revealed that a compressive residual stress was introduced not only on surfaces perpendicular to the axis of the cavitating jet but also on the walls of holes which were parallel to this. It was found that a 51% improvement in fatigue strength could be achieved by cavitation peening. Note that this is first report demonstrating an improvement in the fatigue life of Duralumin plates with fastener holes by cavitation peening.
Highlights
The development of fatigue cracks around fastener holes in aircraft components is a serious problem that affects the life of these components
The cavitation bubbles are generated by injecting a high-speed water jet into a waterfilled chamber through a nozzle
The surface roughness produced by cavitation peening is less than that produced by shot peening [13], and the chemical cleaning required to remove iron stuck to the Duralumin plate after shot peening is not needed after cavitation peening
Summary
The development of fatigue cracks around fastener holes in aircraft components is a serious problem that affects the life of these components. The introduction of a compressive residual stress around the fastener holes, for example by cold expansion [1], can improve the fatigue life. (2014) The Use of Cavitation Peening to Increase the Fatigue Strength of Duralumin Plates Containing Fastener Holes. Cavitation clouds shed periodically from the nozzle and spread out across the surface being treated, and when the bubbles collapse they produce impacts which can deform the material [10]. It may be possible to use such a jet to treat the surfaces of the walls of fastener holes. Since the main factor in improving the fatigue strength by peening is the introduction of compressive residual stress, the residual stresses at the surface of the plates and in the walls surrounding the holes were evaluated by an X-ray diffraction method
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