A probabilistic model for cleavage fracture with a length scale--parameter estimation and predictions of stationary crack experiments |
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Authors: | Jonas Faleskog,Martin Kroon,Hans Ö berg |
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Affiliation: | Department of Solid Mechanics, Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden |
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Abstract: | This study presents a large experimental investigation in the transition temperature region on a modified A508 steel. Tests were carried out on single-edge-notch-bend specimens with three different crack depth over specimen width ratios to capture the strong constraint effect on fracture toughness. Three test temperatures were considered, covering a range of 85 °C. All specimens failed by cleavage fracture prior to ductile tearing. A recently proposed probabilistic model for the cumulative failure by cleavage was applied to the comprehensive sets of experimental data. This modified weakest link model incorporates a length scale, which together with a threshold stress reduce the scatter in predicted toughness distributions as well as introduces a fracture toughness threshold value. Model parameters were estimated by a robust procedure, which is crucial in applications of probabilistic models to real structures. The conformity between predicted and experimental toughness distributions, respectively, were notable at all the test temperatures. |
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Keywords: | Cleavage fracture Failure probability Length scale Threshold toughness Fracture experiments Master curve |
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