PSI - Issue 73

Marie Horňáková et al. / Procedia Structural Integrity 73 (2025) 33 – 37 Author name / Structural Integrity Procedia 00 (2025) 000–000

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2. Variants of 3D printed samples The samples prepared for testing were produced on a Prusa MKS+ 3D printer (Prusa i3, 2022). The prepared prismatic samples were 220 mm long, with a square cross-section of 63 x 63 mm. A hole 100 mm long, 51 x 51 mm in cross section was prepared on both sides. This hole is prepared for the wooden elements to be joined (see Figures 1 and 2). The centre of the 3D specimen is a filled partition approximately 20 mm thick. The specimens had three pairs of 8 mm diameter round holes to accommodate the steel anti-slip pins. Figure 2 shows the direction of printing when the samples were printed perpendicular to the loading direction. Thus, the structure consists of layers of cross-sections.

Fig. 2. Sample number V02 after the test.

The five specimen variants (V01 to V05) differed in the different placement of the holes for the pins (see Figure 3). The hole locations were always axisymmetric. Variants V02, V03 and V05 have holes for the pins in one direction only, whereas in V01 and V04 there are two pairs of holes perpendicular to the third pair. In addition, the location of the holes is different due to the effort and greater scatter in the results and later analysis of the outputs.

Fig. 3. Cross-section drawings of all variants.