PSI - Issue 61

Artem Pepeliaev et al. / Procedia Structural Integrity 61 (2024) 224–231 Artem Pepeliaev / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 1 Geometry of tensile test specimens: (a) infill orientation 0°; (b) infill orientation 90°

In tables and figures standardized abbreviations were introduced for convenience and clarity in interpreting of the results. For instance, designation ABS+GF represents ABS material that is reinforced with short glass fiber (GF). The printing settings used for additive manufacturing are presented in Table 1 for each type of the studied materials. Optimal printing settings for short fiber-reinforced samples and pure polymer samples were different for all types of materials, with exception of PA12. Table 1. Printing settings Parameter Material ABS PA12 PET-G ABS+CF PA12+CF PET-G+GF ABS+GF Table temperature, o C 100 60 60 100 60 90 100 Nozzle temperature, o C 255 265 240 290 265 250 290 Printing speed, mm/s 50 Experiment setup Tensile tests were performed at a constant loading rate of 0.5 mm/min and an ambient temperature of ~20°C on an Instron 68 SC-5 universal testing machine with a 5 kN load cell. The applied force measurement accuracy is 0.5% of the measured value in the range from 5 N to 5 kN with a servo resolution of 0.0095 µm. A Instron AVE2 video extensometer was used for measurement of displacements of two points that were marked on the surface of samples to characterize the elongation of the sample. However, samples made of pure PA12 and PET-G showed deformations too large to be captured by the video extensometer; hence, the displacements for these samples were measured using the data on a step from the servo drive. The mechanical properties of the samples were obtained from the analysis of the stress-strain curve. To collect statistical data, each experiment was repeated for at least 9 samples. 3. Results 3.1. Properties of pure polymeric samples The values of tensile strength and normal tensile modulus are presented in Table 2. The data is grouped according to the nozzle diameter and material type. 2.2.