An assessment of the complete through thickness residual stress distribution after the split sleeve cold expansion of fastener holes


Ozdemir A., Edwards L.

CANADIAN METALLURGICAL QUARTERLY, vol.43, no.2, pp.239-247, 2004 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 2
  • Publication Date: 2004
  • Doi Number: 10.1179/cmq.2004.43.2.239
  • Title of Journal : CANADIAN METALLURGICAL QUARTERLY
  • Page Numbers: pp.239-247

Abstract

Due to its nature, the cold expansion of holes is a three-dimensional process. However, most analytical and experimental techniques developed for determining residual strains and stresses at cold expanded holes are two-dimensional. In the present work, the method of step drilling was used to construct the through thickness pattern of residual hoop stress at a specific orientation of a split sleeve cold expanded hole. Thus, stress distribution in three dimensions was sketched in detail as a topography to portray the stress field at the vicinity of the hole. At this orientation and particularly at the mid-section, stress profiles predicted by the methods of Fourier series expansion, neutron diffraction and a recent finite element analysis are in good agreement with that of the step drilling method. A comparison was also carried out between the topographies of step drilling and neutron diffraction. Good correlation was obtained especially when gauge volume averaging was taken into account.