Issue 73

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

vertical direction) for each individual hole. Detailed description of the experimental procedure is presented in works [20– 21]. Interference fringe patterns obtained as a result of probe hole drilling at point 1 of CP-S coupon are shown in Fig. 5. The hole looks slightly blurred due to damage to the surface layers of the material. Nevertheless, this circumstance does not prevent good resolution of interference fringes in the immediate vicinity of its contour.

u N  = –17.5

v N  = –22.0

(a) Component u ,

(b) Component v ,

Figure 5: Specimen CP_S. Interferograms referred to point 1. Interference fringe patterns, visualized at various points in the vicinity of the contact dimple after drilling a through hole, are shown in Fig. 6.

u N  = –13.5

v N  = +7.5

(a) Component u ,

(b) Component v ,

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