Issue 36

R. Citarella, Frattura ed Integrità Strutturale, 36 (2016) 160-167; DOI: 10.3221/IGF-ESIS.36.16

In Tab. 1 and Tab. 2 the crack length vs. cycles and the related equivalent SIFs are respectively shown. With the aforementioned bidimensional approach a good agreement between numerical and experimental [7] crack scenarios is obtained and it is possible to capture the essential features of the response even if the secondary bending is not modelled.

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N

38

39

40

41

42

43

44

45

47

51

73500 78810 84030 88830 93280 97330 99500 102850 105770 108000 110500 112000 113885 73500 78810 84030 88830 93280 97330 99500 102850 105770 108000 110500 112000 113885 N

1.82 2.63 3.36 4.46 5.20 5.92 6.54 7.23 7.86 9.27

1.42 2.28 3.04 4.18 4.94 5.70 6.37 7.14 7.91

1.16 2.24 2.84 3.43 3.94 4.52 5.13

1.19 1.77 2.17 3.20 3.60 4.00 4.36

1.50 2.28 3.25 4.02 5.02

1.15 1.83 2.59 3.57

1.12 1.94

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1.19 1.78 2.14 2.61

10.30

1.12 1.43 1.69

1.20 1.81

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Table 1 : Crack propagation lengths (mm) versus load cycles.

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38

39

40

41

42

43

44

45

47

51

389 397 406 428 443 456 471 474 505 611 709

400 403 410 435 453 472 496 501 600

391 390 401 415 438 476 549

400 393 390 418 430 500 572

419 417 652 729 750

502 535 720 740

555 631

468 484 527 553

396 400 400

542 548

Table 2 : Equivalent SIF’s (MPa  mm) versus number of cycles.

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