The non-coplanar coalescence of interacting defects in fatigue University of Glasgow, Mechanical Engineering Department

Format:

Conference/Event

Author/Creator:

Bezensek, Bostjan, author.

Conference Name:

SAE Brasil International Conference on Fatigue (2001-12-12 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2001

Summary:

Defects in real structures frequently have complex shapes. The present work examines complex defects which result from the interaction of adjacent coplanar semi-elliptical cracks. Attention is focused on fatigue growth leading to coalescence and the formation of a coplanar single defect with a re-entrant sector.An experimental study investigated the fatigue crack path on the free surface. The study found that the deviations from the straight crack path determine the size of the re-entrant sector and whether coalescence occurs on the surface or sub-surface. Surface coalescence occurs by a shear mechanism resulting in a step in the coalesced crack front.A numerical line spring analysis based on the concept introduced by Rice and Levy [1] and extended by Parks and White [2] to include Mode II and III component, has been used to investigate the effect of coalescence in re-entrant sector on the crack tip parameters. The presence of a step in the re-entrant sector introduces a Mode III component and reduces amplified values of Mode I stress intensity factor, which is a feature of coplanar coalescence. The study concludes with discussion of the significance of non-coplanar coalescence on catastrophic brittle failure

Notes:

Vendor supplied data

Publisher Number:

2001-01-4052

Access Restriction:

Restricted for use by site license