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Experimental determination and modelling of long crack crack-face interference-free crack propagation behaviour in normalized SAE 1045 steel |
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| Authors: | John JF Bonnen Timothy H Topper |
| Affiliation: | 1. Department of Civil & Structural Engineering, University of Sheffield, Mappin Street, Sheffield S1?3JD, UK;2. Blastech Ltd., The BioIncubator, 40 Leavygreave Road, Sheffield S3?7RD, UK;3. Defence Science and Technology Laboratory (Dstl), Porton Down, Salisbury, Wiltshire SP4?0JQ, UK;1. Department of Civil & Environmental Engineering, Yonsei University, Seoul 120-749, South Korea;2. Department of Civil Engineering, Myongji College, Seoul 120-776, South Korea |
| Abstract: | Crack-face interference-free crack growth rate data were obtained from special intermittent overload tests on axial-torsion specimens. Data obtained from these tests and short crack data taken from the literature fell into a single scatter band. These data were used in a short crack growth model to predict the crack length at the changeover from a shear mode to a tensile mode crack plane and the fatigue life for axial-torsional fatigue tests that again used these special overload sequences to achieve crack closure-free/crack-face interference-free crack growth. Model predictions based on two separate criteria for mode change – maximum crack growth rate and maximum strain energy release rate – each predicted reasonably well both the crack length at the change in crack plane and the fatigue life. |
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