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Cohesive Elements for Shells

A cohesive element for shell analysis is presented. The element can be used to simulate the initiation and growth of delaminations between stacked, non-coincident layers of shell elements. The procedure to construct the element accounts for the thickness offset by applying the kinematic relations of shell deformation to transform the stiffness and internal force of a zero-thickness cohesive element such that interfacial continuity between the layers is enforced. The procedure is demonstrated by simulating the response and failure of the Mixed Mode Bending test and a skin-stiffener debond specimen. In addition, it is shown that stacks of shell elements can be used to create effective models to predict the inplane and delamination failure modes of thick components. The results indicate that simple shell models can retain many of the necessary predictive attributes of much more complex 3D models while providing the computational efficiency that is necessary for design

© NASA TP Technical Reports, 2007, núm. 214869

National Aeronautics and Space Administration

Author: Dávila, Carlos G.
Camanho, Pedro Manuel Ponces Rodrigues de Castro
Turon Travesa, Albert
Date: 2007 April
Abstract: A cohesive element for shell analysis is presented. The element can be used to simulate the initiation and growth of delaminations between stacked, non-coincident layers of shell elements. The procedure to construct the element accounts for the thickness offset by applying the kinematic relations of shell deformation to transform the stiffness and internal force of a zero-thickness cohesive element such that interfacial continuity between the layers is enforced. The procedure is demonstrated by simulating the response and failure of the Mixed Mode Bending test and a skin-stiffener debond specimen. In addition, it is shown that stacks of shell elements can be used to create effective models to predict the inplane and delamination failure modes of thick components. The results indicate that simple shell models can retain many of the necessary predictive attributes of much more complex 3D models while providing the computational efficiency that is necessary for design
Format: application/pdf
Document access: http://hdl.handle.net/10256/8243
Language: eng
Publisher: National Aeronautics and Space Administration
Collection: Reproducció digital del document publicat a: http://www.ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070018344_2007018901.pdf
Articles publicats (D-EMCI)
Is part of: © NASA TP Technical Reports, 2007, núm. 214869
Rights: Tots els drets reservats
Subject: Materials laminats
Laminated materials
Materials compostos
Composite materials
Materials compostos -- Mètodes de simulació
Composite materials -- Simulation methods
Title: Cohesive Elements for Shells
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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