Ultrasonic Nondestructive Evaluation of Damage in Continuous Fiber Composites.
Annual technical rept. 1 Feb 84-31 Jan 85,
TEXAS A AND M UNIV COLLEGE STATION MECHANICS AND MATERIALS RESEARCH CENTER
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It is well known that composite materials suffer complex damage when they are subjected to either monotonic or fatigue loading. This damge affects both the velocity and attenuation of ultrasonic waves. The primary objective of this research is to correlate the damage states with the changes in the velocity and attenuation. Once this has been accomplished the pair of ultrasonic parameters becomes a measure of the damage. A very accurate computer-controlled experimental technique to measure wavespeed in a composite material has been developed. For conventional isotropic materials accuracies of two parts per ten thousand were achieved for highly damaged Graphiteepoxy composite materials accuracies of 0.2 have been achieved. Keywords Automation and Fiber reinforced composites.
- Laminates and Composite Materials