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Details of Grant 

EPSRC Reference: GR/L87330/01
Title: VISUALISATION OF THE DEVELOPMENT OF DAMAGE IN COMPOSITES UNDER FATIGUE CONDITIONS
Principal Investigator: Almond, Professor D
Other Investigators:
Harris, Professor B
Researcher Co-Investigators:
Project Partners:
Airbus Group Limited Westland
Department: Engineering & Applied Science
Organisation: University of Bath
Scheme: Standard Research (Pre-FEC)
Starts: 01 April 1998 Ends: 31 March 2001 Value (£): 196,359
EPSRC Research Topic Classifications:
Design Engineering Eng. Dynamics & Tribology
Instrumentation Eng. & Dev.
EPSRC Industrial Sector Classifications:
Manufacturing
Related Grants:
Panel History:  
Summary on Grant Application Form
Conventional ultrasonic c-scanning provides an accurate indication of impact damage in a composite sample. There has been sucess in using c-scanning to monitor damage growth during fatigue by interrupting a test and removing the sample to re-image the defect. However this is an unsatisfactory procedure because of the uncertainty about the appropriate time to interrupt a fatigue programme caused by the broad spread in fatigue lives that is typical of composites. A completely new ultrasonic imaging technique, acoustography, offers the possibilty of monitoring damage growth continuously throughout a fatigue test. It emloyes an ultrasound sensitive liquid crystal material that enables large areas to be imaged instanateously and continuously. This proposal is to develop the acoustography technique to monitor the growth of imact damage and the extension if the deliberateyly introduced manufacturing defects in test peices mounted on a mechanical testing machine and to ues the technique to determine the conditions for impact damage growth in composite samples of interest to, and provided by BAe Airbus Ltd and GKN Westland Helicopters Ltd. The results of this programme would be used by the industrial collaborators to improve design procedures by giving designers confidence in specifying zero-growth conditions for defects and damage in structures.
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Organisation Website: http://www.bath.ac.uk