Currently, structural integrity safety cases are based on avoidance of fracture initiation, providing a pessimistic estimate of structure life. However, crack behaviour at heterogeneous junctions is an area where understanding is particularly limited. Improved data regarding the behaviour of defects at such junctions after initiation may lead to improved assessment of real structures containing welded joints. Furthermore, justification of stable tearing at a material interface would result in increased demonstrable safety and higher plant availability. An experimental study has been carried out to investigate the ductile fracture behaviour of a crack approaching material interfaces. The aim has been to examine and refine current guidelines in the R6 defect assessment procedure. The experiments have been supported by 3D finite element modelling of the specimens and by R6 calculations. A further assessment of the standard (25mm) CT specimen results indicated that the R6 guidance on usage of the toughness in the crack tip medium may not always be conservative. However, the assessment points are conservative when the lowest yield strength or the weighted average yield strength values are used in the R6 fracture assessment.
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ASME 2009 Pressure Vessels and Piping Conference
July 26–30, 2009
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping
ISBN:
978-0-7918-4366-6
PROCEEDINGS PAPER
Progress in the Analysis of Duplex CT Specimen Test Results Using FE Analysis to Assess the Crack Behaviour in Heterogeneous Materials
B. D. Daniels,
B. D. Daniels
Serco Limited, Warrington, Cheshire, UK
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M. A. Wilkes,
M. A. Wilkes
Serco Limited, Warrington, Cheshire, UK
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R. P. Birkett
R. P. Birkett
Serco Limited, Warrington, Cheshire, UK
Search for other works by this author on:
B. D. Daniels
Serco Limited, Warrington, Cheshire, UK
M. A. Wilkes
Serco Limited, Warrington, Cheshire, UK
R. P. Birkett
Serco Limited, Warrington, Cheshire, UK
Paper No:
PVP2009-77211, pp. 293-299; 7 pages
Published Online:
July 9, 2010
Citation
Daniels, BD, Wilkes, MA, & Birkett, RP. "Progress in the Analysis of Duplex CT Specimen Test Results Using FE Analysis to Assess the Crack Behaviour in Heterogeneous Materials." Proceedings of the ASME 2009 Pressure Vessels and Piping Conference. Volume 3: Design and Analysis. Prague, Czech Republic. July 26–30, 2009. pp. 293-299. ASME. https://doi.org/10.1115/PVP2009-77211
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