Development status of air-coupled ultrasonic testing composites
Composite materials with high specific strength,high specific stiffness,high modulus,corrosion resistance and other excellent properties are widely used in aircraft wing,missile shell,aircraft engine shell and other parts.The mechanical properties and service properties of composite materials are affected by various defects in manufacturing and service.Effective methods must be adopted to accurately detect and evaluate various defects in composite materials.Air coupled ultrasonic detection is completely non-contact,non-invasive and non-damaging.It can be better used in the situation that traditional ultrasonic detection is difficult to adapt.It has a broad development prospect.In this paper,1-3 piezoelectric composite transducers,signal processing technology,phase-controlled focused air-coupled ultrasonic testing,the research status of ultrasonic propagation characteristics in composite materials and its interaction with defects are introduced,and the development direction of air-coupled ultrasonic nondestructive testing technology and instruments are discussed.At last,the development trend and application prospect of air-coupled ultrasonic detection are forecasted.
Air-coupled ultrasonic detectionComposite material testingTransducerSignal processingPhased array
NETL
NSTL
万方数据
维普
