Issue 48

S. Bhowmik et alii, Frattura ed Integrità Strutturale, 48 (2019) 419-428; DOI: 10.3221/IGF-ESIS.48.40 422 Figure 3 : Fatigue test set up for three-point bending Figure 4 : Loading pattern for fatigue testing Figure 5: Load-CMOD variations for different beam specimens under static loading The relative displacements are calculated by monitoring and determining the coordinates of the subsets in the digital images. The DIC set-up consists of a digital camera and a VIC-2D software to analyses the images. During the testing process, the whole specimen is illuminated by providing white light. In order to obtain accurate surface deformation and strain measurements in DIC technique, the specimens are prepared with high contrast speckle pattern. A typical speckle pattern applied on beam specimens has been shown in Fig. 1. Good contrast with the background is achieved by first