Ductile tearing of interacting surface breaking defects

Bezensek, B. and Hancock, J.W. (2001) Ductile tearing of interacting surface breaking defects. In: Proceedings of the 10th International Conference on Fracture, Honolulu, Hawaii, 2-6 December 2001, p. 537. ISBN 0080440428

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Abstract

The interaction of coplanar surface breaking defects has been studied numerically and experimentally. Attention has been focussed on the behaviour of re-entrant sectors which form from coalescing fatigue cracks. Fatigue studies and numerical modelling shows that such sectors exhibit enhanced values of the stress intensity factor. The line spring technique was used to analyse a series of evolving configurations, which originate from the interaction of two adjacent semi-elliptical cracks, as shown in Figure 1. Under elastic-plastic conditions amplified values of J-integral were found in the re-entrant sectors, which also exhibit loss of crack tip constraint, as parameterised by T. Numerical work is compared with ductile tearing experiments performed on a plain carbon-manganese steel. The experiments show that ductile tearing initiates from the re-entrant sector and the crack develops towards a bounding shape, as shown in Figure 2. The evolution of the re-entrant crack in ductile tearing is initially similar to the development in fatigue. The conservatism of codified recharacterisation procedures is demonstrated for defects forming a re-entrant sector in fatigue or ductile tearing.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bezensek, Dr Bostjan and Hancock, Professor John
Authors: Bezensek, B., and Hancock, J.W.
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
ISBN:0080440428

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