Influence of model geometry on stress intensity for a cyclically thermally loaded nozzle corner crack

The present numerical study regards the thermal shock experiments on a decommissioned hot steam reactor (HDR) pressure vessel nozzle, in which crack growth was artificially induced. Here, the purpose is to gain confidence in predictive methods for obtaining the stress intensity factory K by establis...

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Bibliographic Details
Published in:Nuclear engineering and design 1989-07, Vol.115 (1), p.1-6
Main Authors: Wanner, R., Brosi, S., Rösel, R., Mercier, O.
Format: Article
Language:English
Subjects:
Applications
Applied sciences
Engineering techniques in metallurgy. Applications. Other aspects
Exact sciences and technology
Metals. Metallurgy
Others aspects
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Summary:The present numerical study regards the thermal shock experiments on a decommissioned hot steam reactor (HDR) pressure vessel nozzle, in which crack growth was artificially induced. Here, the purpose is to gain confidence in predictive methods for obtaining the stress intensity factory K by establishing sufficient stability with respect to variations in geometry and other conditions. This should enable us to rely on realistic estimates even if they are not overly conservative bounds. To this end, we separately studied the influence of the numerical method and of the overall geometry under simplified loading, before attacking the thermal shock problem. Essentially, we found that for cracks as they would be considered for a realistic safety analysis, i.e. with a depth equivalent to the cladding thickness of about 8 mm, this preliminary study indeed shows the robustness we were looking for.
ISSN:0029-5493
1872-759X
DOI:10.1016/0029-5493(89)90254-9