Issue 73

V. Pisarev et alii, Fracture and Structural Integrity, 73 (2025) 108-130; DOI: 10.3221/IGF-ESIS.73.08

Point/ Dimple

Distance from dimple center to probe hole center x / y , mm

u N  , fringes

v N  , fringes

1 σ , MPa

2 σ , MPa

Δ u , μ m

Δ v , μ m

1 x = 1 y = 0

1

–5.0

–19.5

–1.90

–7.41

–99.6

–173.0

5 x = 4.2, 5 y = 0 7 x = 6.1, 7 y = 0 2 x = 8.0, 2 y = 0 6 x = 0, 6 y = 5.2 8 x = 0, 8 y = 6.8 4 x = 0, 4 y = 7.2 3 x = 0, 3 y = 9.8

5

–11.0

+19.5

–4.18

+7.41

–30.0

+124.3

–5.0

+10.5

–1.90

+3.80

7

–10.1

+65.7

2

0.0

+5.5

0.0

+2.08

+16.6

+44.3

–9.9

+10.26

–3.42

+27.0

6

+191.0

+9.1

–12.0

+10.26

–4.56

+27.0

8

+181.9

–15.2

–11.0

+7.60

–4.18

+20.0

4

+128.4

–28.3

–7.5

+5.13

–4.18

+13.5

3

+86.4

–19.7

Table 4: The results of fringe patterns interpretation and values of principal residual stress components near contact dimple in CP_D 25 coupon. Data collections, presented in Tab. 2, Tab. 3 and Tab. 4, provide a possibility of constructing distributions of principal residual stress components over horizontal and vertical cross-section referred to the dimple center. To do this experimental information, obtained for two dimples in each coupon, has to be involved thus minimizing a degree of interaction between neighboring probe holes and its influence on the final result. Properly arranged data, extracted from Tab. 2, Tab. 3 and Tab. 4, allow us to construct dependencies of the values of principal residual stress components from the dimple center distance in two orthogonal directions, which are presented in Figs. 12–14.

(a) (b) Figure 12: The principal residual stress components 1 σ and 2 σ along horizontal symmetry axis y = 0 (a) and vertical symmetry axis x = 0 (b) of CP_S specimen as functions of distance from the dimple center.

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