PSI - Issue 61

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

227

4

Table 2. Values of tensile strength, modulus of elasticity for 3D-printed samples made of pure polymer

Material

Nozzle diameter, mm

Filling angle, degree

Modulus of elasticity, GPa

Tensile strength, MPa

5.26±0.10 3.82±0.17 4.98±0.30 4.46±0.43 1.99±0.04 1.45±0.11 1.87±0.17 1.44±0.09 4.24±0.08 3.34±0.15 4.56±0.20 3.31±0.10

ABS

0.4

0

49.22±1.66 29.43±2.14 58.14±3.38 38.32±4.41 25.90±2.75 15.47±2.75 26.02±2.61 12.20±1.45 37.57±1.41 25.97±1.50 39.89±3.15 20.41±1.42

90

0.8

0

90

PA12

0.4

0

90

0.8

0

90

PET-G

0.4

0

90

0.8

0

90

Based on the experimental data presented in Table 2, it can be concluded that the nozzle diameter had a clear influence on the resulting mechanical properties of samples. Thus, for ABS samples with 90º infill angle gain in tensile strength was 30% when using a 0.8 mm nozzle in comparison to 0.4 mm one, the value of the elastic modulus increased by 16%. However, in the case of PA12, the use of a 0.8 mm nozzle resulted in decrease of tensile strength by 21% and also of elastic modulus by 0.69%. For PET-G, a 21% decrease in tensile strength and a 0.9% decrease in elastic modulus was observed when using 0.8 mm nozzle. For samples with 0º infill angle, the greatest impact of the 0.8 mm nozzle was determined for pure ABS: properties values increased by 18%, while the greatest contribution to the mechanical properties was observed for samples made from PET-G: tensile strength and elastic modulus increased by 6% and 7%, respectively. The results of experiments are also illustrated in Fig. 2 in the form of stress-strain curves. These curves reflect the change in stress as a function of strain level. Introduced abbreviations included manufacturing parameters: • Nozzle diameter: the entry "ABS+GF_04_0" indicates that a sample of glass fiber reinforced ABS material was printed using a 0.4 mm nozzle. • Infill angle: This parameter characterizes an angle at which the material is deposited when printing. For example, a value of "0" indicates that the material was deposited in the direction of application of the load in the experiment.

ABS_0 ABS_90 PA12_0 ABS_0 ABS_90 PA12_0 PA12_90 PET-G_0 PET-G_90 PA12_90 PET-G_0 PET-G_90 ABS_0 ABS_90 PA12_0

ABS_0 ABS_90 PA12_0

ABS_0 ABS_90 PA12_0

60

ABS_0 ABS_90 PA12_0

60

60

PA12_90 PET-G_0 PET-G_90

60

60

50

60

40

PA12_90 PET-G_0 PET-G_90

50

50

PA12_90 PET-G_0 PET-G_90

PA12_90 PET-G_0 PET-G 04 90

50

50

50

30

40

σ (MPa)

40

20

30

40

40

40

σ (MPa)

10

20

30

10

30

0 20 40 60 80 100 120 140 160 180 0

30

30

ε (%)

σ (MPa)

0 20 40 60 80 100 120 140 160 180 0

σ (MPa)

σ (MPa)

σ (MPa)

20

ε (%)

20

20

20

10

10

10

10

0

0

0

0

0

5

10

15

20

25 15

30

35

0

5 0

10

15

20

25

30

35

5

10

15

20

25

30

35

0

5

10

20

25

30

35

ε (%)

ε (%)

ε (%)

ε (%)

(a)

(b)

Fig. 2 Stress-strain diagram for a series of pure polymer samples with different nozzles and infill angles: (a) 0.4 mm nozzle; (b) 0.8mm nozzle