Issue 53

P. Fathi, Frattura ed Integrità Strutturale, 53 (2020) 457-473; DOI: 10.3221/IGF-ESIS.53.36 470 In Tab. 9, it is shown the analysis of variance (ANOVA) for different layers for the Design Expert software. Row L 1 Degree L 2 Degree L 3 Degree L 4 Degree Energy (kJ) 1 0 45 -45 90 633 2 0 45 90 -45 653 3 0 -45 45 90 633 4 0 -45 90 45 653 5 0 90 45 -45 589 6 0 90 -45 45 589 7 45 0 -45 90 626 8 45 0 90 -45 583 9 45 -45 0 90 565 10 45 -45 90 0 565 11 45 90 0 -45 582 12 45 90 -45 0 626 13 -45 0 45 90 627 14 -45 0 90 45 581 15 -45 45 0 90 564 16 -45 45 90 0 566 17 -45 90 0 45 584 18 -45 90 45 0 627 19 90 0 45 -45 547 20 90 0 -45 45 548 21 90 45 0 -45 608 22 90 45 -45 0 590 23 90 -45 0 45 607 24 90 -45 45 0 592 25 0 45 -45 -90 633 Table 8: Comparison of fracture energy for different angles. Std Block Factor 1 A: Layer 1 Factor 2 B: Layer 2 Factor 3 C: Layer 3 Factor 4 D: Layer 4 1 Block 1 0.00 45.00 -45.00 90.00 2 Block 1 0.00 45.00 90.00 -45.00 3 Block 1 0.00 -45.00 45.00 90.00 4 Block 1 0.00 -45.00 90.00 45.00 5 Block 1 0.00 90.00 45.00 -45.00 6 Block 1 0.00 90.00 -45.00 45.00 7 Block 1 45.00 0.00 -45.00 90.00 8 Block 1 45.00 0.00 90.00 -45.00 9 Block 1 45.00 -45.00 0.00 90.00 10 Block 1 45.00 -45.00 90.00 0.00 11 Block 1 45.00 90.00 0.00 -45.00 12 Block 1 45.00 90.00 -45.00 0.00 13 Block 1 -45.00 0.00 45.00 90.00 14 Block 1 -45.00 0.00 90.00 45.00 15 Block 1 -45.00 45.00 0.00 90.00 16 Block 1 -45.00 45.00 90.00 0.00 17 Block 1 -45.00 90.00 0.00 45.00 18 Block 1 -45.00 90.00 45.00 0.00 19 Block 1 90.00 0.00 45.00 -45.00 20 Block 1 90.00 0.00 -45.00 45.00 21 Block 1 90.00 45.00 0.00 -45.00 22 Block 1 90.00 45.00 -45.00 0.00 23 Block 1 90.00 -45.00 0.00 45.00 24 Block 1 90.00 -45.00 45.00 0.00 25 Block 1 0.00 45.00 -45.00 -90.00 Table 9: Analysis of variance (ANOVA)for different layers.