PSI - Issue 41

Cosmin-Florin Popa et al. / Procedia Structural Integrity 41 (2022) 557–563 Author name / Structural Integrity Procedia 00 (2019) 000–000

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and 210°C, respectively for PLA. In case of PETG specimens the nozzle temperature was set at 240°C and the built platform was controlled to be at around 250°C.

Fig. 1. The IZOD specimen dimensions

The tests were performed using Instron CEAST 9050 equipment, with a 0.9225 Kg hammer that impacts the specimens at a velocity of 3.46 m/s. The specimen is correctly positioned in the vice jaw with a centering pin adapted for notched specimens and, blocked by turning a handwheel clockwise, Fig. 2a. The hammer is released at an angle of 150 degrees. The point of impact is at the top of the specimen, 22 mm from the top of the notch, Fig.2b.

a)

b)

Fig. 2. a) Specimen clamped in the vice; hammer uplifted, and b) Hammer released, before impact

The tests were carried out in the edgewise direction. The impact energy absorbed by the specimen and IZOD impact strength were computed using the Eq. (1) and (2). � � � �� � ∙ ds � � � Eq. (1) a �� � � h ∙ b � ∙ 10 � Eq. (2) Where: – is deflection, m. F – is force, N. i – is Izod impact strength, KJ/m 2 . E c – is the corrected energy, in joules, absorbed by breaking the test specimen. h – is the thickness, in millimeters, of the test specimen. – is the remaining width, in millimeters, of the test specimen.