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Energy absorption capability of composite bolted joints undergoing extended bearing failure

Hassan, Jazib and Feser, Thomas and O'Higgins, Ronan and Waimer, Matthias and McCarthy, C. T. and Toso, Nathalie and Byrne, Michael and McCarthy, M. A. (2020) Energy absorption capability of composite bolted joints undergoing extended bearing failure. Composite Structures, 237 (111868). Elsevier. DOI: 10.1016/j.compstruct.2020.111868 ISSN 0263-8223

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Official URL: https://www.sciencedirect.com/science/article/pii/S0263822319338474?dgcid=coauthor#!

Abstract

Innovative crashworthiness strategies are needed for future narrow-body composite fuselage aircraft due to limited crash energy absorption capability below the cargo floor. A recently-proposed approach is to use specially-designed “tension absorber” joints which absorb energy through an extended bearing failure process. To explore the design space, experimental tests are performed on pin-loaded joints in a widely-used carbon fibre/epoxy composite, with varying stacking sequence, pin diameter and laminate thickness. A bespoke rig is used to pull the pin completely through the laminate. Performance parameters include ultimate bearing strength, mean crushing stress and mass-specific energy absorption. Three-dimensional computed tomography (3D CT) and scanning electron microscopy are used to examine failure and damage. Diameter-to-thickness ratio is found to be an excellent predictor of energy absorption, with small values giving best results, provided the thickness is sufficient to avoid global bending of the specimen. The use of a well-characterised material and availability of 3D CT data enables the results to be used for validation of analysis tools.

Item URL in elib:https://elib.dlr.de/133889/
Document Type:Article
Title:Energy absorption capability of composite bolted joints undergoing extended bearing failure
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hassan, JazibBernal Institute, School of Engineering, University of LimerickUNSPECIFIED
Feser, ThomasThomas.Feser (at) dlr.dehttps://orcid.org/0000-0003-4741-5361
O'Higgins, RonanBernal Institute, School of Engineering, University of LimerickUNSPECIFIED
Waimer, Matthiasmatthias.waimer (at) dlr.deUNSPECIFIED
McCarthy, C. T.Bernal Institute, School of Engineering, University of LimerickUNSPECIFIED
Toso, NathalieNathalie.Toso (at) dlr.dehttps://orcid.org/0000-0003-2803-1450
Byrne, MichaelBernal Institute, School of Engineering, University of LimerickUNSPECIFIED
McCarthy, M. A.Bernal Institute, School of Engineering, University of LimerickUNSPECIFIED
Date:24 January 2020
Journal or Publication Title:Composite Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:237
DOI :10.1016/j.compstruct.2020.111868
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Composite bolted joints; Mechanical testing; Energy absorption; Bearing failure
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Structural Integrity
Deposited By: Feser, Thomas
Deposited On:28 Jan 2020 11:50
Last Modified:28 Jan 2020 11:50

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