The master's thesis addresses the functioning of the digital image correlation (DIC) method for measuring specific deformations of a test specimen in a thermal chamber. Understanding the DIC method is crucial for establishing the experimental system and subsequently understanding the influences on the measurement results. The key difference between measurements inside and outside the thermal chamber is the limitation of measuring through the chamber's smaller glass observation window, which reflects and refracts light and significantly restricts the possibilities for illuminating the test specimen. The thesis discusses the effects of the distance between the cameras and the test specimen, the material (composite, aluminium), the size of the test specimen, and various correlation parameters. The measurement results obtained with digital image correlation are compared with measurements obtained using an extensometer to determine the method's deviation. The latter shows comparable results for digital image correlation both inside and outside the thermal chamber. Guidelines for measurements using the digital image correlation method in a thermal chamber are provided.
|
