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Classical and sequential limit analysis revisited

Article dans une revue avec comité de lecture
Author
LEBLOND, Jean-Baptiste
541882 Institut Jean Le Rond d'Alembert [DALEMBERT]
REMMAL, Almahdi
MORIN, Léo
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccKONDO, Djimedo
1798 Institut d'Alembert [IDA]

URI
http://hdl.handle.net/10985/14080
DOI
10.1016/j.crme.2017.12.015
Date
2018
Journal
Comptes Rendus Mécanique

Abstract

Classical limit analysis applies to ideal plastic materials, and within a linearized geometrical framework implying small displacements and strains. Sequential limit analysis was proposed as a heuristic extension to materials exhibiting strain hardening, and within a fully general geometrical framework involving large displacements and strains. The purpose of this paper is to study and clearly state the precise conditions permitting such an extension. This is done by comparing the evolution equations of the full elastic–plastic problem, the equations of classical limit analysis, and those of sequential limit analysis. The main conclusion is that, whereas classical limit analysis applies to materials exhibiting elasticity – in the absence of hardening and within a linearized geometrical framework –, sequential limit analysis, to be applicable, strictly prohibits the presence of elasticity – although it tolerates strain hardening and large displacements and strains. For a given mechanical situation, the relevance of sequential limit analysis therefore essentially depends upon the importance of the elastic–plastic coupling in the specific case considered.

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