PSI - Issue 38

11

Christophe Grosjean et al. / Procedia Structural Integrity 38 (2022) 94–108 C.Grosjean and al. / Structural Integrity Procedia 00 (2021) 000 – 000

104

a

b

Fig. 12. (a) material data (b) rugosity measurement example

The calculation was a strain-life method with a Neuber elastoplastic correction [7] and a Smith-Watson-Topper mean strain correction [8] using nCode 2021 [9]. Table 6 and Table 7 presents experimental and calculation results in relation with different critical location presented previously and different applied pressures.

Table 6. Correlation of fatigue calculation with test results (1)

Residual stress measurements taken into account

Pmin [bar]

Pmax [bar]

Possible crack initiation area

Rz [µm] in area

Nb cycles from fatigue calculation

Test reference

Experimental nb cycles to failure

No

166 (Fig. 13)

A B C D E F G

90

1

21 000

Yes Yes

10 066

3

653

60

No No

7 820

18 030

250

90 900

Yes

No failure

No

22 810

60

Yes Yes Yes

No failure

60 60

139 291

1 564 460