Implication of X-ray Diffraction Method for Non-Destructive Testing While Conducting Mechanical Laboratory Tests.

In this paper, we investigate the possibilities of applying the method of microfocus X-ray diffraction to assess microdamages in structures made of composite materials. We carried out a qualitative and quantitative assessment of microdamages arising during mechanical tests in the construction of polymer composite materials using the example of a structurally similar element of a flange having a L-shaped section and made of carbon fiber using the technology of autoclaved molding. During the experiment, radiographic images of the sample were obtained at fixed levels of tensile force. The obtained images were analyzed for the appearance of interlayer separation as the main type of damage arising in the microstructure of the analyzed detail. We determined the locations and approximate values of interlayer cracks sizes at various load levels. We found, that after removal of the load, interlayer cracks “close” and are hardly identified by means of non-destructive testing afterwards. [ABSTRACT FROM AUTHOR]