Abstract
In this study, a temperature insensitive damage evaluation parameter is proposed. Ultrasonic wave velocity was measured for different propagation direction in order to evaluate angular dependence of ultrasonic wave propagation. Every experiment was conducted at constant temperature to eliminate influence of temperature variation. Consequently, it was found that anisotropy of wave velocity does not change even if temperature changes, although wave velocity itself changes with temperature. It was also found that formation of cracks causes significant change in ultrasonic anisotropy therefore it can be used as a temperature independent damage evaluation parameter for FRP laminates.
