Effect of circular holes on the ratchet limit and crack tip plastic strain range in a centre cracked plate

Haofeng Chen, Weihang Chen, Tianbai Li, James Michael Ure

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Abstract

In this paper a centre cracked plate subjected to cyclic tensile loading and cyclic bending moment is considered. The effect of circular holes drilled in the region of the crack tip on the ratchet limit and crack tip plastic strain range is studied. Direct evaluation of the ratchet limit and crack tip plastic strain range is solved by employing the new Linear Matching Method (LMM). Parametric studies involving hole diameter and location are investigated. The optimum hole location for reducing the crack tip plastic strain range with the least reduction in ratchet limit is identified, and located at a distance 10% of the semi-crack length from the crack tip on the side opposite the ligament for both cyclic tensile loading and cyclic bending moment cases. It is also observed that the optimum location is independent of the hole size for both cyclic loading cases.
Original languageEnglish
Pages (from-to)2310-2324
Number of pages15
JournalEngineering Fracture Mechanics
Volume78
Issue number11
Early online date19 May 2011
DOIs
Publication statusPublished - Jul 2011

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Keywords

  • ratchet limit
  • shakedown
  • linear matching method
  • centre cracked plate

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