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Investigation of geometrical and composite material parameters for tension-absorbing bolted joints

Hassan, Jazib and O'Higgins, Ronan and Feser, Thomas and McCarthy, C. T. and Waimer, Matthias and Toso, Nathalie and McCarthy, M. A. (2019) Investigation of geometrical and composite material parameters for tension-absorbing bolted joints. ICCM22, 11.-16. August 2019, Melbourne, Australien.

Full text not available from this repository.

Abstract

In the event of an aircraft crash landing, the fuselage cross-section tends to ovalise. This leads to tension loading of the passenger and cargo floor cross-beams. In past research activities, this has been identified as an opportunity to absorb energy, through a novel design of the frame to cross-beam attachments [1]. These specialised attachments are referred to as tension-absorbing joints. They are designed to protect the bolt from early failure and provide guidance for it to push through, and crush, the composite adherends over a considerable distance, leading to a substantial amount of energy absorption. In the present work, material and geometrical parameters of these joints are investigated experimentally to provide data for a design database. A simplified version of the joint is tested, in which a pin is pulled through a 2 mm thick composite laminate using a specialised experimental rig. The bearing strength and energy absorption capabilities are investigated under quasi-static loading, for 4 mm and 12 mm diameter pins and three different stacking sequences. Two different specimen widths are employed to determine the extent of damage progression towards the specimen edge. Digital Image Correlation (DIC) is used to measure the pin displacement. It is found that symmetric layups with a repeating unit of [45/ 45/90/0] inhibit off-axis pin movement, providing for a consistent test, and that the wider specimen is required to avoid the damage reaching all the way to the specimen edge. For both pin diameters, an interspersed stacking sequence results in higher values of peak load, mean crushing load and specific energy absorption than a blocked layup

Item URL in elib:https://elib.dlr.de/128913/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation of geometrical and composite material parameters for tension-absorbing bolted joints
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hassan, JazibBernal Institute, School of Engineering, University of LimerickUNSPECIFIED
O'Higgins, RonanBernal Institute, School of Engineering, University of LimerickUNSPECIFIED
Feser, ThomasThomas.Feser (at) dlr.dehttps://orcid.org/0000-0003-4741-5361
McCarthy, C. T.Bernal Institute, School of Engineering, University of LimerickUNSPECIFIED
Waimer, Matthiasmatthias.waimer (at) dlr.deUNSPECIFIED
Toso, NathalieNathalie.Toso (at) dlr.dehttps://orcid.org/0000-0003-2803-1450
McCarthy, M. A.Bernal Institute, School of Engineering, University of LimerickUNSPECIFIED
Date:August 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Bolted joints, layup, energy absorption, bearing strength
Event Title:ICCM22
Event Location:Melbourne, Australien
Event Type:international Conference
Event Dates:11.-16. August 2019
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:16 Sep 2019 14:50
Last Modified:16 Sep 2019 14:50

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