Issue 62

Yu. G. Matvienko et alii, Frattura ed Integrità Strutturale, 62 (2022) 541-560; DOI: 10.3221/IGF-ESIS.62.37

Stage number, k

Remote stress increment   0

Total remote stress value   0 Σ k , MPa

Maximum circumferential strain increment   3 Δ 10 k x

Total maximum circumferential strain value   3 ΣΔ 10 k x

k , MPa

1 2 3 4 5 6 7 8 9

35.0 35.0 35.0 30.0 27.0 25.0 23.0 20.0

35.0 70.0 105.0 135.0 162.0 187.0 210.0 230.0 200.0 170.0 135.0 100.0 65.0 30.0 –30.0 –60.0 –90.0 –120.0 0.0

1.26 1.30 1.26 1.23 1.39 1.81 1.65 2.00

1.26 2.56 3.82 5.05 6.44 8.25 9.90

 A MAX

x ε

11.90 =

–30.0 –30.0 –35.0 –35.0 –35.0 –35.0 –30.0 –30.0 –30.0 –30.0 –30.0

–1.04 –1.22 –1.38 –1.23 –1.33 –1.36 –1.23 –1.27 –1.08 –1.33 –0.98

10.86 9.64 8.26 7.03 5.70 4.44 3.21 1.94 0.86 –0.47 –0.82 –0.19 0.70 x ε

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

 A MIN

–1.45 =

30.0 30.0 30.0

–90.0 –60.0 –30.0

0.63 0.63 0.81

Table 1: Load stages and results of fringe patterns interpretation for the first cycle.

Stage number, k

Remote stress increment   0 k , MPa

Total remote stress value   0 Σ k , MPa

Maximum circumferential strain increment   3 Δ 10 k x

Total maximum circumferential strain value   3 ΣΔ 10 k x

1 2 3 4 5 6 7 8 9

35.0 38.0 38.0 35.0 30.0 28.0 26.0

35.0 73.0

1.41 1.49 1.55 1.40 1.23 1.24 1.22

1.41 2.90 4.45 5.85 7.08 8.32 8.29 6.85 5.38 4.02 2.62 1.19 x ε

111.0 146.0 176.0 204.0 230.0 193.0 155.0 118.0 80.0 42.0 –30.0 –60.0 –90.0 –90.0 –60.0 –30.0 5.0 –120.0

 A MAX

9.54 =

–37.0 –38.0 –37.0 –38.0 –38.0 –37.0 –35.0 –30.0 –30.0 –30.0

–1.25 –1.44 –1.47 –1.36 –1.40 –1.43 –1.37 –0.94 –0.90 –0.85

10 11 12 13 14 15 16 17 18 19 20 21

–0.18 –1.12 –2.02 –2.07 –1.26 –0.43 x ε

 A MIN

–2.87 =

30.0 30.0 30.0 30.0

0.80 0.81 0.83 0.73

0.0 0.40 Table 2: Load stages and results of fringe patterns interpretation for the second cycle.

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