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Details of Grant 

EPSRC Reference: GR/R56747/01
Title: Physically-Based Approach to Mixed Mode Fracture in Composite Laminates: Development and Validation
Principal Investigator: Guild, Professor FJ
Other Investigators:
Drinkwater, Professor B
Researcher Co-Investigators:
Project Partners:
Ministry of Defence (MOD) National Physical Laboratory
Department: Mechanical Engineering
Organisation: University of Bristol
Scheme: Standard Research (Pre-FEC)
Starts: 01 September 2002 Ends: 31 August 2005 Value (£): 88,178
EPSRC Research Topic Classifications:
Eng. Dynamics & Tribology Materials Characterisation
EPSRC Industrial Sector Classifications:
Energy Aerospace, Defence and Marine
Related Grants:
GR/R56730/01
Panel History:  
Summary on Grant Application Form
The overall aim of this project is to provide validated constitutive relations for crack accumulation in composite laminates which are necessary for the first generation of physically based design tools which are needed by industry. The deliverables of this project will enable design engineers to allow explicitly for damage growth in composite components in service, analogous to accepted methods for post-yield design in metallic components. The experimental work, analytical modelling and finite element studies to be carried out will provide the constitutive equations describing the behaviour of cracked laminates. Mixed mode failure criteria for intralaminar matrix cracking will be developed using model (0/theta/0) GFRP and novel (0/theta/0) GFRP/CFRP hybrid laminates. The progressive failure of symmetric quasi-isotropic laminates under generalised inplane loading will be studied in detail (experimentally, analytically and using finite element simulations) in order to develop the models. A damagetolerant design carries with it the practical requirement to be able to detect and quantify damage in service. Hence another key element of the programme is the development of novel ultrasonic techniques for the detection of either crack arrays or single cracks. The final validation task involves blind testing of the proposed failure criteria and the ultrasonic techniques using an additional lay-up.
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Organisation Website: http://www.bris.ac.uk