Computational investigation into crack surface prying and friction forces in cracks oriented at various angles, subjected to semi random loading

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Authors
  1. Yuen, B.
  2. Taheri, F.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Dalhousie Univ, Halifax NS (CAN) Dept of Civil and Resource Engineering
Abstract
The present work investigated the possible prying effect at a fatigue crack tip due to the contact of crack surface asperities when a compressive underload was applied. The investigation consisted of finite element analyses of centre-cracked specimens with gap elements incorporated into the models to simulate crack surface roughness and friction. The results showed that while an underload increased the J-integral of the following load cycle and could possibly cause crack growth acceleration, the prying effect diminished its effect. In addition, the prying effect appeared to be more significant with increasing crack inclination angle and crack surface friction.

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Report Number
DRDC-ATLANTIC-CR-2007-048 — Contractor Report
Date of publication
01 Mar 2007
Number of Pages
42
DSTKIM No
CA031730
CANDIS No
530724
Format(s):
CD ROM

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