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Title: A hybrid approach to determine ductile fracture resistance
Authors: Qian, X. 
Yang, W.
Keywords: Fracture resistance
Hybrid approach
J-R curve
Load-line displacement
Issue Date: 2011
Citation: Qian, X., Yang, W. (2011). A hybrid approach to determine ductile fracture resistance. Procedia Engineering 10 : 319-324. ScholarBank@NUS Repository.
Abstract: This article describes a hybrid approach to determine the ductile fracture resistance for laboratory specimens, combining both the numerically computed and experimentally measured load (P) versus load-line displacement (LLD) relationships for metallic fracture specimens. The hybrid approach employs the same principle as the conventional, multiple-specimen experimental method in determining the energy release rate. This method computes the P-LLD curves from multiple finite element (FE) models, each with a different crack depth. The experimental procedure measures the P-LLD curve from a standard fracture specimen with a growing crack. The intersections between the experimental P-LLD curve and the numerical P-LLD curves from multiple FE models dictate the LLD levels to compute the strain energy (U) using the area under the numerical P-LLD curves. This approach eliminates the requirement of using multiple fracture specimens and the requirement of measuring the compliance of the specimen via a multiple unloading procedure. In addition, this approach does not require the measurement of the crack-mouth opening displacement (CMOD). The validation procedure shows very accurate prediction of the J-Δa resistance curve for SE(B) specimens under mode I loading. © 2011 Published by Elsevier Ltd.
Source Title: Procedia Engineering
ISSN: 18777058
DOI: 10.1016/j.proeng.2011.04.055
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