In the master's thesis, the identification of a crack in a 3D-printed specimen, made from polymer material, under vibration fatigue is addressed in three ways: monitoring the decrease in natural frequency, identifying crack growth through high-speed camera recording and optical flow methods, and identifying cracks based on thermoelastic phenomena, which represents the main objective of the thesis. For the purpose of testing, appropriate specimen had been designed and printed, on which the formation and growth of the crack were determined.
The specimen was fatigued on a shaker, and the damage was monitored with a laser vibrometer, a high-speed camera, and a high-speed thermal camera. It was found that crack growth can be determined by analyzing the power spectrum of temperature.
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