Non-Destructive Inspection Approach Using Ultrasound to Identify the Material State and Internal Temperature for Amorphous and Semi-Crystalline Materials




Jost, Elliott

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Many invasive techniques exist to identify the temperature and phase of a semicrystalline material. Most current methods require physical contact or implicit techniques utilizing light reflectance of the specimen. This work presents an ultrasonic nondestructive inspection approach that circumvents these disadvantages to identify phase change regions and infer a material’s internal temperature. An experiment is constructed and performed to capture the ultrasonic characteristics of a wax as it undergoes melting and subsequent cooling. Results show a clear relationship between material speed of sound and temperature. This thesis demonstrates the range of temperature over which the semi-crystalline material melts is readily identified by the speed of sound represented as a function of material temperature. The investigated ultrasonic NDE method has direct applications in many industries, including oil and gas, food and beverage, and polymer matrix composites, Specifically, the method has many implications for expanding current capabilities of nondestructive inspection of multiphase materials.



Ultrasound, Non-Destructive Inspection, NDE, polymers, Differential Scanning Calorimetry