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3. Preventing plastic instability damage
3.1 Definition
Beyond the threshold of excessive deformation, two antagonistic effects appear as the applied load increases:
strain-hardening of the material results in an increase in the stress to be applied to the material to continue its deformation (this effect was neglected in the assessment of limit loading), until the tensile strength (noted R m ) of the material is reached;
modification of the shape tends firstly to improve resistance (the cylinder tends to take on the shape of a sphere, for example) and secondly, through the combined effect of increasing the diameter and reducing the resistant cross-section, tends on the contrary to weaken it....
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Preventing plastic instability damage
Prevention of buckling
Documentation sources
Text references
Websites
ASME American Society of Mechanical Engineers http:/;/;www.asme.org
AFCEN Association Française pour les règles de conception et de construction des Chaudières Électro-Nucléaires (French association for the design and construction of electro-nuclear boilers) http:/;/;www.afcen.com
...Regulations
Arrêté du 12 décembre 2005 applicable aux Équipements Sous Pression Nucléaires (ESPN) ; JO de la République Française, January 22, 2006.
Arrêté du 26 février 1974 portant application de la réglementation des appareils à pression aux chaudières nucléaires à eau. Collection of texts published in "Sûreté Nucléaire en France". Les éditions des Journaux Officiels.
Directive 97/;23/;EC...
Standards
- Récipients sous pression non soumis à la flamme. - NF EN 13445 -
- Tuyauteries industrielles métalliques. - NF EN 13480 -
- Chaudières à tubes d'eau et installations auxiliaires. - NF EN 12952 -
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