It is well known that material fracture toughness is influenced by factors including loading mode and crack size that influence the level of stress triaxiality ahead of the crack tip. This so-called “constraint effect” has been demonstrated both experimentally and analytically, with low constraint (low stress triaxiality) conditions leading to enhanced fracture toughness. Two-parameter fracture mechanics has been developed to provide a framework within which to assess the influence of constraint on safety margins for shallow structural defects. However, this requires the availability of a significant amount of plant-specific material with which to measure the materials’ constraint sensitivity experimentally. This paper presents a case study where constraint effects on cleavage fracture toughness of a shallow-cracked biaxially loaded bend specimen are assessed through a combination of modelling and miniaturised testing. The assessment is performed using the Failure Assessment Diagram approach of R6. It is concluded that the approach provides a practical engineering method for assessing the likely magnitude of constraint effects for low constraint configurations.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4670-9
PROCEEDINGS PAPER
Engineering Assessment of Constraint Effects on Cleavage Fracture
Andrew Sherry,
Andrew Sherry
Serco Assurance, Risley, Cheshire, UK
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Dennis Hooton,
Dennis Hooton
Serco Assurance, Risley, Cheshire, UK
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David Lidbury
David Lidbury
Serco Assurance, Risley, Cheshire, UK
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Andrew Sherry
Serco Assurance, Risley, Cheshire, UK
Dennis Hooton
Serco Assurance, Risley, Cheshire, UK
David Lidbury
Serco Assurance, Risley, Cheshire, UK
Paper No:
PVP2004-2549, pp. 91-99; 9 pages
Published Online:
August 12, 2008
Citation
Sherry, A, Hooton, D, & Lidbury, D. "Engineering Assessment of Constraint Effects on Cleavage Fracture." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Flaw Evaluation, Service Experience, and Materials for Hydrogen Service. San Diego, California, USA. July 25–29, 2004. pp. 91-99. ASME. https://doi.org/10.1115/PVP2004-2549
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