Issue 53

P. Fathi, Frattura ed Integrità Strutturale, 53 (2020) 457-473; DOI: 10.3221/IGF-ESIS.53.36

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 2 3 4 5 6 7 8 9

0 0 0 0 0 0

45 45

-45 90 45 90 45 -45 -45 90

90 -45 90 45 -45 45 90 -45 90

633 653 633 653 589 589 626 583 565 565 582 626 627 581 564 566 584 627 547 548 608 590 607 592

-45 -45 90 90 -45 -45 90 90 0 0

45 45 45 45 45 45

0

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

90

0

0

-45

-45 45 90

0

-45 -45 -45 -45 -45 -45 90 90 90 90 90 90

0 0

90 45 90

45 45 90 90

0

90

0

0

45

45 45

0

0 0

-45 45 -45

-45

45 45

0

-45

0

-45 -45 45

0

45

45 -45

0

0 633 Table 8: Comparison of fracture energy for different angles. -90

Factor 1 A: Layer 1

Factor 2 B: Layer 2

Factor 3 C: Layer 3

Factor 4 D: Layer 4

Std

Block

1 2 3 4 5 6 7 8 9

Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1 Block 1

0.00 0.00 0.00 0.00 0.00 0.00

45.00 45.00 -45.00 -45.00 90.00 90.00 -45.00 -45.00 90.00 90.00 0.00 0.00 45.00 45.00 90.00 90.00 0.00 0.00 45.00 45.00 -45.00 -45.00 45.00 0.00 0.00

-45.00 90.00 45.00 90.00 45.00 -45.00 -45.00 90.00 0.00 90.00 0.00 -45.00 45.00 90.00 0.00 90.00 0.00 45.00 45.00 -45.00 -45.00 0.00 45.00 -45.00 0.00

90.00 -45.00 90.00 45.00 -45.00 45.00 90.00 -45.00 90.00 0.00 90.00 45.00 90.00 0.00 45.00 0.00 -45.00 45.00 -45.00 0.00 45.00 0.00 -90.00 0.00 -45.00

45.00 45.00 45.00 45.00 45.00 45.00 -45.00 -45.00 -45.00 -45.00 -45.00 -45.00 90.00 90.00 90.00 90.00 90.00 90.00

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

0.00

Table 9: Analysis of variance (ANOVA)for different layers.

470