Fatigue Crack Control in Structural Details using surface peening

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dc.contributor.authorBrennan, Feargal P.
dc.contributor.authorShi Song, Ngiam
dc.date.accessioned2011-01-27T12:19:15Z
dc.date.available2011-01-27T12:19:15Z
dc.date.issued2008-08
dc.description.abstractThis paper presents an analytical and experimental study of crack shape evolution in steel plate specimens under cyclic loading. It is widely known that the introduction of compressive residual stresses by cold working the surface can be highly beneficial in improving the fatigue performance of structural components. Although it is recognised that relaxation of surface compressive residual stress can reduce the potential benefits, the effects of residual stress on crack shape evolution are often overlooked. Previous studies have shown that the intensity of the surface compressive residual stress has a pronounced effect on fatigue crack initiation. A recently developed technique termed controlled stitch cold working, which applies differing intensities of compressive residual stress at specific regions in a structure, is shown in the paper to influence fatigue crack propagation life considerably. The approach can be used to prevent crack growth in particular directions for example encouraging a controlled or fail-safe scenario. The paper describes fatigue crack growth tests on shot peened specimens tested under uniaxial tension. The specimens were peened to varying intensities and of differing coverage areas. Cracks were initiated from starter notches after peening meaning the approach can be used for fatigue performance enhancement at the construction stage or later as part of a maintenance and repair strategy. Crack growth retardation is apparent in all tests and this is attributed to the constrained crack shape. Further work will consider the use of laser and ultrasonic peening to contain cracks from rapidly propagating from stress concentrations. This approach used with careful design of stiffness can significantly extend the fatigue cracken_UK
dc.identifier.citationNgiam, Shi Song; Brennan, Feargal P.; Fatigue Crack Control in Structural Details Using Surface Peening, Journal of Ship Production, Volume 24, Number 3, August 2008 , pp147-151en_UK
dc.identifier.issn8756-1417
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/4778
dc.language.isoenen_UK
dc.publisherSociety of Naval Architects and Marine Engineers (SNAME)en_UK
dc.subjectResidual Stressen_UK
dc.subjectCrack Shape Controlen_UK
dc.subjectFatigueen_UK
dc.subjectSurface Cracken_UK
dc.subjectShot Peeningen_UK
dc.titleFatigue Crack Control in Structural Details using surface peeningen_UK
dc.typeArticleen_UK

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