Progress and challenges to NDE of composites using obliquely insonified ultrasonic waves

摘要

The high stiffness to weight ratio, low electromagnetic reflectance and the ability to embed sensors and actuators have made polymer-matrix fiber-reinforced composites an attractive primary construction material for modern high performance structures. However, the multiple step production process and the inherent non-homogeneity of their brittle matrix make these composites susceptible to the formation of many possible defects throughout their life cycle. Another limiting factor in widespread use of composites is their high cost - composite parts are about an order of magnitude more expensive than metallic parts. In addition, the cost of inspection is about 30