PSI - Issue 47

Andrea Iadarola et al. / Procedia Structural Integrity 47 (2023) 383–397 A. Iadarola / Structural Integrity Procedia 00 (2019) 000 – 000

392 10

2504.3 MPa (115.00) 1752.7 MPa (145.00) 981.1 MPa (82.33)

2684.9 MPa (191.50) 1968.1 MPa (187.00) 1146.5 MPa (73.95)

2909.6 MPa (215.70) 2131.0 MPa (29.40) 1264.7 MPa (111.67)

31%

41%

51%

Table 6 shows the mean values of elastic modulus obtained from tensile tests and the corresponding standard deviations in order to highlight the statistical variability of the results for the three specimens tested. The values of elastic modulus are obtained with a curve fitting in the linear initial part of the curve.

Table 7 . Ultimate Tensile Strength (UTS) mean values in quasi-static and dynamic tensile test conditions Total Bio-Content UTS at 0.1 mm/s (Std. Deviation) UTS at 10 mm/s (Std. Deviation) UTS at 100 mm/s (Std. Deviation)

74.3 MPa (0.22) 64.8 MPa (2.00) 39.4 MPa (1.00) 22.5 MPa (1.44)

88.0 MPa (0.12) 80.0 MPa (7.60) 51.9 MPa (0.88) 29.7 MPa (1.10)

96.7 MPa (19.57) 86.3 MPa (9.40) 54.8 MPa (2.31) 34.2 MPa (2.08)

27%

31%

41%

51%

Table 7 shows the mean values of UTS obtained from tensile tests and the corresponding standard deviations in order to highlight the statistical variability of the results for the three specimens tested. Fig. 8 shows the variation of elastic modulus mean values with respect to the total bio-content of the tested materials. A linear decreasing trend is observed by increasing the total bio-content of the resin and a similar decreasing slope is obtained at different strain rates.

Fig. 8 . Elastic modulus variation with respect to the total bio-content