Issue 50

G.V. Seretis et alii, Frattura ed Integrità Strutturale, 50 (2019) 517-525; DOI: 10.3221/IGF-ESIS.50.43

Figure 3 : Main effect plots for UTS for a , T 1

and h 1

factors.

Figure 4 : Main effect plots for flexural strength for a , T 1

and h 1

factors.

Source

dF Sum of squares

Mean square F-value P value C (%)

A: Heating Rate [ o C/min] 4

661.7 423,2 2235

165.4 105,8 558.6

0.51 0.31 2.26

0.73

9.23

B: Temperature [ o C]

4 4

0.865 0.098

5.9

C: Time [h] 31.18 Table 3 : ANOVA results for tensile tests without interaction, * Significant at 95% confidence level.

Source

dF Sum of squares Mean square

F-value P value C (%)

A: Heating Rate [ o C/min]

4 4 4

2644 8925 5004

661

0.54 2.43 1.12

0.711 0.082 0.374

9.68

B: Temperature [ o C]

2231.2

32.67

C: Time [h] 18.32 Table 4 : ANOVA results for flexural tests without interaction, * Significant at 95% confidence level. Parameter Optimal Parameters A 3 B 5 C 1 Experimental Predicted UTS (MPa) 214.65 218.848 Error % 1.95 % Table 5 : Confirmation table for optimum tensile performance. 1251

521