Influence of initial stresses on cleavage fracture of pressure vessel containing a part circumferential surface crack
Publish place: 13th Annual Conference of Mechanical Engineering
Publish Year: 1384
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ISME13_670
تاریخ نمایه سازی: 21 اسفند 1385
Abstract:
One critical issue in the integrity assessment of pressurised vessels to be addressed is characterising the influence of initial residual stresses (arising from fabrication processes especially around welds, where the appearance of cracks is also a likely event) on cleavage fracture. Using a specific crack configuration, this paper explores the stress state at crack tip area under similar loading conditions with and without the presence of initial stresses as well as their interaction and compares the stress fields in the context of stress based statistical modelling of cleavage fracture toughness. A recently developed local stress based approach to failure probability prediction for cleavage fracture of ferritic steels is used to predict toughness distributions. It is found that the presence of initial residual stresses dramatically change the final fracture conditions.
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Authors
Saeid Hadidimaud
Assistant Professor, Ferdowsi University, Iran / visiting fellow, University of Bristol, UK; Dr., Mechanical Engineering, University of Bristol, BS۸ ۱TR, UK , Mechanical Engineering, Ferdowsi University of Mashhad, Iran
David Smith
Faculty Director of Research and Head of Structural Integrity; University of Bristol, UK; Prof. Mechanical Engineering, University of Bristol, BS۸ ۱TR, UK
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