Residual stress analysis in cold-worked holes with interference bushing. (10th April 2007)

• Record Type: Journal Article
• Authors: Giglio, Marco; Lodi, Marco
• Is Part Of: International journal of material & product technology. Volume 30:Number 1-3(2007)
• Page Start: 67
• Page End: 89
• Publication Date: 2007-04-10
• Subjects: cold working -- interference bushing -- cold-worked holes -- residual stress -- cold expansion -- split sleeve -- split mandrel -- fatigue design -- aerospace structures -- finite element analysis -- FEA -- hole fatigue life; Manufacturing processes -- Periodicals; Materials -- Testing -- Periodicals; 620.11
• Languages: English
• ISSNs: 0268-1900

Abstract

Cold working is widely applied in fatigue design of mechanical and aeronautical components with holes in order to induce a stress compression field in the most loaded zone and thus increase fatigue life. None of the investigations in literature consider the insertion of a bushing in the hole by a cold expansion process: in particular cases may be predicted the presence of tensile circumferential residual stress on hole surface, often loaded by external cyclic forces. The present investigation introduces a closed-form analytical method for simply predict the complete residual stress distribution on a cold-expanded bushing-hole connection commonly used in aerospace structures, under imposed conditions. A comparison of these solutions with 2-D finite element analysis reveals perfect agreement. Finally, the paper discusses the results of the closed-form solution obtained on several bushing-hole combinations, providing interesting indications in the fatigue design in order to obtaining the highest benefits on hole fatigue life.