Issue 59

Yu. G. Matvienko et alii, Frattura ed Integrità Strutturale, 59 (2022) 115-128; DOI: 10.3221/IGF-ESIS.59.09

Specimen

RSH_3

RSH_4

RSH_5

RSH_6

RSH_7

1 a . mm

1.7

1.78

1.92

1.74

1.81

0 Δ v . µm

− 23.18

− 20.14

− 23.18

− 22.04

− 19.0

0 u . µm

3.23

3.23

3.04

3.42

2.28

1 u . µm

3.42

3.42

3.42

3.8

2.85

 1 , MPa m

− 11.8

− 16.7

− 21.9

− 19.7

− 11.3

I K

Table 3: The first notch length and values of fracture mechanics parameters for Side B of RSH specimens.

a

b

c d Figure 8: Experimental values of fracture mechanics parameters as a function of number of cycles: for notches of ଵ length: a – NMOD Δ ଴ ∆v෤ ଴ ; b – SIF ூ ଵ K෩ ଵ ୍ ; c – U 0 , component 0 u ; d – U 1 , component 1 u . Normalized evolution of NMOD, SIF, U 0 and U 1 values over lifetime, which follow from the presented results in Fig. 8, are shown in Fig. 9a, 9b, 9c and 9d, respectively.

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