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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.

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 Authors
Orifici, Adrian C.Royal Melbourne Institute of Technology
Thomson, Rodney S.Cooperative Research Centre for Advanced Composite Structures Limited
Degenhardt, RichardUNSPECIFIED
Bisagni, ChiaraPolitecnico di Milano
Bayandor, JavidRoyal Melbourne Institute of Technology
Date:2006
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
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Doris Ries
Deposited On:12 Nov 2007
Last Modified:12 Dec 2013 20:23

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