Stress intensity factors for tunnelling corner cracks under mode I loading |
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| Authors: | Antunes,Ferreira,Branco,& Byrne |
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| Affiliation: | Department of Mechanical Engineering, University of Coimbra, Pólo II, 3030 Coimbra, Portugal,;UME/IST, Technical University of Lisbon, 1096 Lisbon Codex, Portugal,;Department of Mechanical and Manufacturing Engineering, University of Portsmouth, Portsmouth PO1 3DJ, UK |
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| Abstract: | Stress intensity factors (SIFs) presented in the literature for corner cracks are limited to ideal quarter-circular and quarter-elliptical crack shapes. This paper presents SIF solutions for corner cracks that exhibit tunnelling, extending the range of corner crack shapes illustrated in the literature. Solutions were developed in a parametric form, obtained by empirically fitting polynomials to numerical values of SIF obtained from the FEM. A parameter was defined to quantify the extent of tunnelling. It was observed that crack shape has a significant effect on the SIF, so the consideration of equivalent quarter-circular cracks can produce inaccurate results when significant tunnelling occurs. SIF solutions for quarter-circular cracks are also presented and compared with those quoted in the literature. |
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| Keywords: | stress intensity factor corner crack tunnelling effect quarter-circular cracks |
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