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Development of a Degradation Model for the Collapse Analysis of Composite Aerospace Structures

Orifici, Adrian C. and Thomson, Rodney S. and Degenhardt, Richard and Bisagni, Chiara and Bayandor, Javid (2006) Development of a Degradation Model for the Collapse Analysis of Composite Aerospace Structures. III European Conference on Computational Mechanics, 2006-06-04 - 2006-06-08, Lissabon, Portugal.

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Abstract

For stiffened structures in compression the most critical damage mechanism leading to structural collapse is delamination or adhesive disbonding between the skin and stiffener. This paper presents the development of a numerical approach capable of simulating interlaminar crack growth in composite structures as a representation of this damage mecha-nism. A degradation methodology was proposed using shell layers connected at the nodes by user-defined multiple point constraints (MPCs), and then controlling the properties of these MPCs to simulate the initiation and propagation of delamination and disbonding. A fracture mechanics approach based on the Virtual Crack Closure Technique (VCCT) is used to detect growth at the delamination front. Numerical predictions using the degradation methodology were compared to experimental results for double cantilever beam (DCB) specimens to dem-onstrate the effectiveness of the current approach. Future development will focus on address-ing the apparent conservatism of the VCCT approach, and extending the application of the method to other specimen types and stiffened structures representative of composite fuselage designs. This work is part of the European Commission Project COCOMAT (Improved MA-Terial Exploitation at Safe Design of COmposite Airframe Structures by Accurate Simulation of COllapse), an ongoing four-year project that aims to exploit the large strength reserves of composite aerospace structures through more accurate prediction of collapse.

Item URL in elib:https://elib.dlr.de/47359/
Document Type:Conference or Workshop Item (Paper)
Title:Development of a Degradation Model for the Collapse Analysis of Composite Aerospace Structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Orifici, Adrian C.Royal Melbourne Institute of TechnologyUNSPECIFIED
Thomson, Rodney S.Cooperative Research Centre for Advanced Composite Structures LimitedUNSPECIFIED
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Bisagni, ChiaraPolitecnico di MilanoUNSPECIFIED
Bayandor, JavidRoyal Melbourne Institute of TechnologyUNSPECIFIED
Date:2006
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:Composite, skin-stiffener separation, VCCT element, DCB, COCOMAT
Event Title:III European Conference on Computational Mechanics
Event Location:Lissabon, Portugal
Event Type:international Conference
Event Dates:2006-06-04 - 2006-06-08
Organizer:Associação Portuguesa de Mecânica Teórica, Aplicada e Computacional
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: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Ries, Doris
Deposited On:12 Nov 2007
Last Modified:31 Jul 2019 19:19

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