PSI - Issue 68

Masayuki Arai et al. / Procedia Structural Integrity 68 (2025) 3–8 M. Arai et al. / Structural Integrity Procedia 00 (2025) 000–000

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Table 1. FE analysis results.

Fig. 4. Load–displacement curve obtained by FE analysis.

3. Fracture property of CT specimens printed by stereolithography 3D printer 3.1. Fabrication procedure and tensile procedure

In this study, the CT test specimens were fabricated using an SLA 3D printer (Form 3+, Form Labs). The printer is equipped with a light-processing unit (LPU), a flexible resin tank, a mixer to stir the resin and ensure its homogeneity, and a heater to maintain a constant temperature in the modeling area. In addition, stereolithography 3D printers require postprocessing, which includes cleaning and secondary curing. Therefore, this study used a cleaning machine (Form Wash, Form Labs) to wash excess resin from the model using isopropyl alcohol (IPA), and a secondary curing machine (Form Cure, Form Labs) to bring the model to a more stable cured state after cleaning. A tensile testing machine (AGS-X, load cell capacity of 5 kN, Shimadzu Corporation) was used for the tensile testing of the 3D-printed CT specimens. The tensile tests were performed at a constant crosshead speed of 10 mm/min