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Constraint Correction of Fracture Toughness CTOD for Fracture Performance Evaluation of Structural Components Pages: 19 Published: Jan 2004
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View License Agreement Source: STP1429-EB Abstract A correction of CTOD for constraint loss in large-scale yielding conditions is made on the basis of the Weibull stress fracture criterion, that eliminates an excessive conservatism in the conventional fracture assessment and material fracture toughness requirement. A CTOD ratio = / (< 1) is proposed, where is the CTOD of a wide plate component and is an equivalent CTOD of the fracture toughness specimen at which the toughness specimen gives a compatible Weibull stress with the wide plate. The CTOD ratio is decreased to a large extent after full yielding of the wide plate component, which is more significant for a high yield ratio and a deep surface crack in the wide plate. The Weibull modulus exerts a marginal influence on . A case study is presented on the application of the CTOD ratio to the fracture performance assessment of full-scale column-to-beam connections subjected to cyclic and dynamic loading.
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