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Closed-form solution for postbuckling of composite flanges

Beerhorst, Matthias and Seibel, M. and Mittelstedt, Christian (2018) Closed-form solution for postbuckling of composite flanges. In: Eighth international conference on thin-walled structures. Eighth international conference on thin-walled structures - ICTWS 2018, 24.-27.07.2018, Portugal, Lissabon. ISBN 978-989-20-8665-1

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Abstract

This paper presents closed form approximate solutions for the postbuckling behavior of orthotropic composite flanges under longitudinal compression. The lay-up is balanced and symmetrical. Regarding the boundary conditions, the two transversal edges are simply supported, one longitudinal edge is free and the other one rotationally restrained. Solutions of high computational efficiency are derived from an approach which uses shape functions with only few variables. It allows for a closed form solution of Airy’s stress function using the compatibility condition of in-plane strains. With the Galerkin procedure the equilibrium condition is approximately satisfied yielding a load-deflection relationship. From the deflection other quantities such as in-plane displacements, stresses and strains can be calculated. For typical flange geometries the derived method shows excellent agreement with results obtained from detailed finite element analyses.

Item URL in elib:https://elib.dlr.de/121442/
Document Type:Conference or Workshop Item (Speech)
Title:Closed-form solution for postbuckling of composite flanges
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Beerhorst, Matthiasmatthias.beerhorst (at) dlr.deUNSPECIFIED
Seibel, M.UNSPECIFIEDUNSPECIFIED
Mittelstedt, ChristianTU DarmstadtUNSPECIFIED
Date:July 2018
Journal or Publication Title:Eighth international conference on thin-walled structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISBN:978-989-20-8665-1
Status:Published
Keywords:Orthotropic plate, Closed-form, Postbuckling, Flange
Event Title:Eighth international conference on thin-walled structures - ICTWS 2018
Event Location:Portugal, Lissabon
Event Type:international Conference
Event Dates:24.-27.07.2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Beerhorst, Matthias
Deposited On:13 Dec 2018 06:06
Last Modified:13 Dec 2018 06:06

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