Acoustography as a means of monitoring impact damage in composites under fatigue conditions

Chen, A. S.; Almond, D. P.; Harris, B.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1239
Academic Journal
Acoustography is a novel ultrasonic imaging technique in which the ultrasound that passes through a test piece from a broad sound source is imaged by a liquid crystal screen acousto-optic detector. Its advantage is that large area real-time ultrasonic images can be produced without the need for scanning. An acoustography system has been adapted to image defects in samples whilst they are subjected to fatigue in a dynamic mechanical testing machine. The samples studied are of aircraft carbon fiber composite which have been impact damaged at the “barely visible impact damage” (BVID) level. The aim of the work is to determine “safe” zero damage growth fatigue lives of the composites. The integration of the acoustography imaging system and the fatigue testing machine will be explained. The data taking and image analysis procedures developed to provide quantitative measures of damage size as a function of fatigue cycles will be outlined. Damage growth data will be presented. © 2000 American Institute of Physics.


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