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9.1.7 Lamb Wave Sensing Lamb wave sensing involves propagating Lamb waves (a form of elastic waves able to propagate through a solid material) through a sample, and using a transducer to pick up their signal. The amplitude of the signal is used to determine the damage present in the part. Transducers need to be stuck to the part to both transmit and receive the waves. Advantages ■ The method can be used over large areas quickly Disadvantages ■ Poor defect characterisation, with some defects being undetectable ■ Waves will not propagate in uncured material 9.1.8 Radiography In radiography, X-rays are fired at one surface of the sample, and then collected by a receiver on the other side. Different materials absorb different amounts of radiation as the x-rays pass through the sample, and thus defects are seen. To observe cracks or delaminations, it can be necessary to use a dye-penetrant; Advantages ■ Simple and quick method for detection ■ Good resolution systems available Disadvantages ■ X-ray equipment is expensive ■ Health & safety considerations 9.2 Destructive testing To provide material allowables during design stage, and to verify manufacturing pro- cesses and material properties, it is common to perform mechanical testing. 66 - GTC-6-0417PDF Image | GUIDE TO COMPOSITES
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