Temperature Effects on Fracture Toughness Parameters for Pipeline Steels
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The present article showcases a temperature dependent cohesive zone model (CZM)-based finite element simulation of drop weight tear test (DWTT), to analyse fracture behavior of pipeline steel (PS) at different temperatures. By co-relating the key CZM parameters with known mechanical properties of PS at varying temperature, a temperature dependent CZM for PS is proposed. A modified form of Johnson and Cook model has been used for the true stress–strain behavior of PS. The numerical model, using Abaqus/CAE 6.13, has been validated by comparing the predicted results with load–displacement curves obtained from test data. During steady-state crack propagation, toughness parameters (such as CTOA and CTOD) were found to remain fairly constant at a given temperature. These toughness parameters, however, show an exponential increase with increase in temperature. The present paper offers a plausible approach to numerically analyze fracture behavior of PS at varying temperature using a temperature dependent CZM.
KeywordsDynamic fracture Pipeline steel Temperature effect Cohesive zone model Steady-state crack propagation Finite element
The present research is supported by NSERC (Natural Science and Engineering Research Council) of Canada (CRD program CRDPJ 399497) and TransCanada Pipelines Ltd. The valuable suggestions of YJ Wang, University of Alberta are much appreciated.
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