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Benoît Paermentier https://orcid.org/0000-0003-4527-0226 Dimitri Debruyne https://orcid.org/0000-0002-9940-7200 Reza Talemi

Abstract

Initiation and propagation of ductile fractures are a major consideration during the design of high-pressure pipelines. Consequences of a pipeline failure can be catastrophic thus structural integrity must be ensured over several decades. Traditional lab-scale experiments such as the Charpy V-Notch (CVN) and Drop Weight Tear Test (DWTT), impact experiments on a notched three-point bending sample, are widely used to measure the fracture toughness of a material. However, with increasing wall thickness and the transition to high-grade steels in the pipeline industry, the size-effect of the specimen and inverse fracture became prominent issues. A new testing methodology called the Dynamic Tensile Tear Test (DT3) is currently investigated as to address the issues presented by the current state of the art.


In this study, a numerical investigation is conducted on the CVN, DWTT and DT3 experiments to compare the modelling of dynamic ductile fracture propagation in three different testing scales using the Gurson-Tvergaard-Needleman (GTN) damage model. X70 and X100 pipeline steel grades are used to model material behaviour. For each considered lab-scale experiment, the dynamic ductile fracture behaviour was successfully reproduced using the GTN damage model.

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    Section
    SI: 1st Benelux Network Meeting and Workshop on Damage and Fracture Mechanics

    How to Cite

    Paermentier, B., Debruyne, D. and Talemi, R. (2020) “Numerical modelling of dynamic ductile fracture propagation in different lab-scale experiments using GTN damage model”, Frattura ed Integrità Strutturale, 14(52), pp. 105-112. doi: 10.3221/IGF-ESIS.52.09.