Bending of delaminated composite conoidal shells under uniformly distributed load / Suman Kumari in Journal of engineering mechanics, Vol. 137 N° 10 (Octobre 2011)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 137 N° 10 (Octobre 2011) . - pp.660-668 Titre : Bending of delaminated composite conoidal shells under uniformly distributed load Type de document : texte imprimé Auteurs : Suman Kumari, Auteur ; Dipankar Chakravorty, Auteur Année de publication : 2012 Article en page(s) : pp.660-668 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Bending Composite materials Delamination Finite-element method Static structural analysis Shells Roofs Résumé : Conoidal shells are very popular roofing units owing to their aesthetic elegance and stiffness. Many parts of the globe, which were earlier assumed to be seismologically stable, are now being considered as earthquake prone. Hence the necessity to build light structures using composites has become very important. In this paper an eight-noded isoparametric shell element is applied for analyzing the bending behavior of delaminated composite conoidal shells under a uniformly distributed load with different practical boundary conditions. To ensure compatibility of deformation and equilibrium of forces and moments at the delamination crack front, a multipoint constraint algorithm is incorporated, which leads to an unsymmetrical stiffness matrix. This formulation is validated through the solution of benchmark problems. Lamination, curvature, and extent of delamination area are varied to compare the performances of delaminated conoidal shells against those with no damage. The results are carefully observed, and a set of conclusions is presented at the end of the paper. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i10/p660_s1?isAuthorized=no [article] Bending of delaminated composite conoidal shells under uniformly distributed load [texte imprimé] / Suman Kumari, Auteur ; Dipankar Chakravorty, Auteur . - 2012 . - pp.660-668. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 10 (Octobre 2011) . - pp.660-668 Mots-clés : Bending Composite materials Delamination Finite-element method Static structural analysis Shells Roofs Résumé : Conoidal shells are very popular roofing units owing to their aesthetic elegance and stiffness. Many parts of the globe, which were earlier assumed to be seismologically stable, are now being considered as earthquake prone. Hence the necessity to build light structures using composites has become very important. In this paper an eight-noded isoparametric shell element is applied for analyzing the bending behavior of delaminated composite conoidal shells under a uniformly distributed load with different practical boundary conditions. To ensure compatibility of deformation and equilibrium of forces and moments at the delamination crack front, a multipoint constraint algorithm is incorporated, which leads to an unsymmetrical stiffness matrix. This formulation is validated through the solution of benchmark problems. Lamination, curvature, and extent of delamination area are varied to compare the performances of delaminated conoidal shells against those with no damage. The results are carefully observed, and a set of conclusions is presented at the end of the paper. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i10/p660_s1?isAuthorized=no

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