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Failure of CFRP airframe sandwich panels under crash-relevant loading conditions

Sturm, Ralf and Klett, Yves and Kindervater, Christof (2014) Failure of CFRP airframe sandwich panels under crash-relevant loading conditions. Composite Structures (112), pp. 11-21. Elsevier. DOI: 10.1016/j.compstruct.2014.02.001 ISSN 0263-8223

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Abstract

New aircraft fuselage concepts have to prove equivalent crashworthiness standards compared to conventional metallic fuselages for certification. Brittle failure mechanisms of CFRP structures make the verification of equivalent crashworthiness for novel CFRP fuselage concepts challenging since conventional metal fuselages absorb a significant part of the kinetic energy by plasticization. In this context, the damage initiation and failure of twin-walled fuselage panels were investigated under crash relevant bending compression loads. Since the sandwich failure is initiated by core failure, a trigger concept for CFRP composite sandwich panels was developed based on local modifications in the fold pattern of the core for controlled failure initiation. By locally adjusting the collapse strength of the core in normal direction, the failure position and failure load can be adapted according to the defined kinematic hinge requirements. The core trigger concept was validated in experiments with triggered and untriggered sandwich panels under identical loading conditions.

Item URL in elib:https://elib.dlr.de/113095/
Document Type:Article
Title:Failure of CFRP airframe sandwich panels under crash-relevant loading conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sturm, RalfBT-SiNUNSPECIFIED
Klett, YvesUniversität StuttgartUNSPECIFIED
Kindervater, ChristofBT-SiDUNSPECIFIED
Date:8 February 2014
Journal or Publication Title:Composite Structures
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.compstruct.2014.02.001
Page Range:pp. 11-21
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Crash,Sandwich structures, Foldcore, Energy absorption
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Structural Integrity
Deposited By: Sturm, Ralf
Deposited On:18 Sep 2017 15:38
Last Modified:31 Jul 2019 20:10

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