PSI - Issue 65

Boris Voloskov et al. / Procedia Structural Integrity 65 (2024) 302–309 Voloskov et al./ Structural Integrity Procedia 00 (2024) 000–000

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Fig. 1. (a) printing baseplate layout; (b) schemes of scanning strategies.

Two types of specimens were produced in this study. The first type consists of cylindrical rods, 20 mm in height and 5 mm in diameter, to be used for X-ray computed tomography (XCT) analysis. The specimens were printed according to layout illustrated in Fig. 1a. Six specimens with different hatch distances (50 µm, 80 µm, 110 µm) were produced using both printing strategies (NP and chessboard), with three samples printed for each strategy. The second type is specimens for tensile testing. Eighteen specimens were printed for tensile testing, with three specimens allocated for each specific combination of hatch distance and scanning strategy. In addition, two specimens produced by each strategy with hatch distance of 80 µm was analyzed using XCT. The geometry of these tensile specimens is shown in Fig. 2a. In addition, Fig. 2b shows a photograph of the baseplate after printing. No specimens in the current work were machined or subjected to heat treatment. A General Electric v|tome|x L 300 XCT scanner was used to examine the distribution of defects in the specimens resulting from the printing processes. Scanning was performed at an X-ray tube voltage of 140 kV and a current of 60 mA. A voxel size of 8 μm was achieved, allowing scans of approximately 15 mm in height within the gauge region of the specimens. XCT image analysis was performed using VGStudio Max Fiji ImageJ (Rueden et al. 2017) and Avizo software tools. Static tension test was performed on electromechanical machine Instron 5969 (Norwood, MA, USA). The load capacity of the machine for compression and tension is up to 50 kN. All specimens were tested at a loading rate of 2 mm per min. The deformation was measured with the extensometer Epsilon 3442-005M with a gauge length of 10 mm. The photo of tensile test is shown in Fig. 2c. 2.2. Experimental Procedures

Fig. 2. (a) tensile specimen geometry; (b) tensile specimens on the baseplate; (c) tensile testing.