Contribution to pressure vessels design of innovative methods and comparative application with standardized rules on a realistic structure - part. II

Créé le : 03/07/2014

Rohard P., Panier S., Hariri Said, Simonet Y., Afzali M. - 2014 - Revue European journal of mechanics…

Conception of pressure vessels subjected to various natures of loading must prevent damage mechanisms occurrence. For a solicitation with repeated variations, secondary failure modes can appear, such as progressive deformation or ratchetting. For design by analysis, the main rule proposed by codes against this phenomenon, based on an elastic stress calculation, is the so-called 3f (or 3Sm) criterion. During the last years, studies have shown that the satisfaction of this condition could be an unreliable check, and proposed to restrict its applicability. In parallel, technological and theoretical developments enabled shakedown analyses to be considered as an interesting design methodology, and to be suggested in standards and codes (EN 13445, CODAP) from the early 2000’s. In this second of two companion papers, a set of standardized and innovative procedures is introduced. These approaches rely on various concepts, such as elasticity, incremental elastic-plasticity, elastic compensation (Linear Matching Method), Gockfeld theory (Uniform Modified Yield, Load Dependent Yield Modification), or the research of stabilized cycle (Direct Cyclic Analysis). Each method is presented on theoretical aspects, and applied on a model inspired from a real industrial reactor. Results are compared to reference data from codes, in terms of accuracy and computing time, and a final assessment underlines practical benefits that could be expected.

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Yves Simonet
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