A probabilistic model for cleavage fracture with a length scale - parameter estimation and predictions of stationary crack experiments
2004 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 71, no 1, 57-79 p.Article in journal (Refereed) Published
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 degreesC. 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.
Place, publisher, year, edition, pages
2004. Vol. 71, no 1, 57-79 p.
cleavage fracture, failure probability, length scale, threshold toughness, fracture experiments, Master curve
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-12788DOI: 10.1016/S0013-7944(03)00066-3ISI: 000185968600004ScopusID: 2-s2.0-0141993233OAI: oai:DiVA.org:kth-12788DiVA: diva2:318823
QC 20100511 QC 201110312010-05-112010-05-112011-10-31Bibliographically approved