PSI - Issue 48

Milan Travica et al. / Procedia Structural Integrity 48 (2023) 280–287 Travica et al / Structural Integrity Procedia 00 (2019) 000 – 000

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test load of 100 kN. The testing machine was set to follow the guidelines out-lined in [33], with a test speed of 1 mm/min. The Trapezium software was employed to track stroke displacements and force values throughout the experiment

Fig. 2. Detailed view PRTS testing tool with specimen: (1) Upper Fork; (2) Lower Fork; (3) Upper D block; (4) Lower D block; (5) PRTS; (6) Tensile testing machine.

The experiments on strain fields were conducted using the Aramis 2M system (GOM, Germany), which utilizes the three-dimensional Digital Image Correlation (3D DIC) technique. Calibration was performed as part of the experimental setup. Detailed information regarding the operation mode, calibration, object preparation, and measuring procedure can be found in various studies [26-32]. The specific Aramis setup settings for this study were as follows:  Two CCD cameras with resolution of 1600×1200 pixels;  Two 50 mm camera lenses;  Measuring volume of 105 mm×75 mm×55 mm;  Measuring distance (distance between camera support and center of measuring volume) 800 mm;  Facet (subset) size 25×20 pixels;  Calibration point variability of 0.034 pixels (for a correct calibration, the manufacturer states that calibration deviation may be between 0.01 and 0.04 pixels);  LED lamp for specimen lighting.

Fig. 3. Detailed view of testing setup.