ULTRASONIC NONDESTRUCTIVE EVALUATION OF FIBER-REINFORCED COMPOSITE-MATERIALS - A REVIEW
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abstract
This paper reviews various ultrasonic nondestructive evaluation techniques applicable to fibre-reinforced composites. The techniques are briefly described and key references are cited. Methods to evaluate the reduced stiffness of composites due to micro-damage are described. Results show that for composites through-the-thickness attenuation increases and stiffness does not change due to transverse cracks, but in-plane stiffness and attenuation changes are substantial and can be measured by the Lamb wave techniques. 1987 the Indian Academy of Sciences.