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9.1.4 Computed Tomography Computed tomography (CT scanning) passes x-rays through a body of material, and collects them via a receiver placed behind the part. This is done from multiple angles around the body, and the results then interpreted to build up a 3-D image of the part, showing the size and location of any defects present. Advantages ■ 3-D image gives accurate information about defect size/ location ■ High resolution of part achievable Disadvantages ■ Very costly and time-consuming ■ Health & safety considerations 9.1.5 Shearography In shearography, a specimen is deformed by an externally applied force, and the re- sulting out-of-plane displacements measured using laser speckle interferometry. The expected deformation pattern is known from the boundary conditions placed upon the specimen by the loading configuration, with any differences from this being a result of damage in the specimen. Advantages ■ Effective in locating debonded areas ■ Gives accurate information on the size and shape of the defect Disadvantages ■ Will only detect differences in displacements ■ The equipment is expensive 9.1.6 Thermography In thermography, the sample is heated, usually via a flash gun or similar, and an infrared camera used to view the thermal conductivity of the part. The response will be differ- ent where there are defects present compared to those areas where there are not. Advantages ■ The method is quick to implement and can cover large areas Disadvantages ■ Defects at a depth greater than 3x their diameter cannot be detected ■ The equipment is expensive GTC-6-0417 - 65PDF Image | GUIDE TO COMPOSITES
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