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Multi-layer aramid fiber-reinforced composites are a difficult object of non-destructive testing. Fiber-reinforced composites usually come in the form of a laminate, the basic layer of which is formed by fiber bonded with resin. One of the most effective methods in non-destructive testing of these composites is ultrasound infrared thermography. It is an active method in which an ultrasound source is used as the source of thermal stimulation of tested material. Typical defects are: delamination, breakage of fibers. The paper shows that in addition to detecting defects, it is also possible to determine the depth of their location under the surface of tested sample based on changes in temperature signal.
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