Optimum design of shell structures with random geometric, material and thickness imperfections

Lagaros, ND; Papadopoulos, V

dc.contributor.author	Lagaros, ND	en
dc.contributor.author	Papadopoulos, V	en
dc.date.accessioned	2014-03-01T01:24:49Z
dc.date.available	2014-03-01T01:24:49Z
dc.date.issued	2006	en
dc.identifier.issn	0020-7683	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17452
dc.subject	Evolutionary computations	en
dc.subject	Nonlinear shell finite element	en
dc.subject	Random imperfections	en
dc.subject	Reliability-based design optimization	en
dc.subject	Spectral representation	en
dc.subject.classification	Mechanics	en
dc.subject.other	Computational methods	en
dc.subject.other	Elasticity	en
dc.subject.other	Evolutionary algorithms	en
dc.subject.other	Finite element method	en
dc.subject.other	Optimization	en
dc.subject.other	Random processes	en
dc.subject.other	Spectrum analysis	en
dc.subject.other	Nonlinear shell finite element	en
dc.subject.other	Random imperfections	en
dc.subject.other	Reliability-based design optimization (RBDO)	en
dc.subject.other	Spectral representation	en
dc.subject.other	Shells (structures)	en
dc.title	Optimum design of shell structures with random geometric, material and thickness imperfections	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijsolstr.2006.02.019	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijsolstr.2006.02.019	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The optimum design of isotropic shell structures with random initial geometric, material and thickness imperfections is investigated in this paper and a robust and efficient methodology is presented for treating such problems. For this purpose, the concept of an initial ""imperfect"" structure is introduced involving not only geometric deviations of the shell structure from its perfect geometry but also a spatial variability of the modulus of elasticity as well as of the thickness of the shell. An efficient reliability-based design optimization (RBDO) formulation is proposed. The objective function is considered to be the weight of the structure while both deterministic and probabilistic constraints are taken into account. The overall probability of failure is taken as the global probabilistic constraint for the optimization procedure. Numerical results are presented for a cylindrical panel, demonstrating the efficiency as well as the applicability of the proposed methodology in obtaining rational optimum designs of imperfect shell-type structures. © 2006 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Solids and Structures	en
dc.identifier.doi	10.1016/j.ijsolstr.2006.02.019	en
dc.identifier.isi	ISI:000241432900016	en
dc.identifier.volume	43	en
dc.identifier.issue	22-23	en
dc.identifier.spage	6948	en
dc.identifier.epage	6964	en