An Improved Theoretical Process-Zone Model for Delayed Hydride Cracking Initiation at a Blunt V-Notch

Peer reviewed: 
Yes, item is peer reviewed.
Scholarly level: 
Faculty/Staff
Final version published as: 

Huang, Y., and Rajapakse, R.K.N.D. An Improved Theoretical Process-Zone Model for Delayed Hydride Cracking Initiation at a Blunt V-Notch. Engineering Fracture Mechanics. In Press.

Date created: 
2018-01-30
Keywords: 
Delayed hydride cracking (DHC)
Fracture mechanics
Plasticity
Process-zone
Stress intensity factor
Abstract: 

Delayed hydride cracking (DHC) is an important concern for pressure tubes used in nuclear reactors.  In this paper, an improved analytical process-zone model is developed based on the deformation fracture criteria. A V-notch with rounded root, which is widely adopted in mechanical testing of DHC, is considered and the proposed model includes the effect of both notch angle and tip radius. Comparisons with experiments show that the proposed model has a prediction accuracy closer to the current engineering process-zone model but with slightly less conservatism. The model is extended to account for plasticity and constraint effects at the flaw tip by introducing an empirical factor that depends on key material and geometric parameters.

Description: 

The full text of this paper will be made available 24 months after publication in accordance with the embargo period of Engineering Fracture Mechanics. If you require access to the full text please contact summit@sfu.ca.

Language: 
English
Document type: 
Article
Rights: 
Rights remain with the authors.
Sponsor(s): 
Natural Sciences and Engineering Research Council of Canada (NSERC)
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