PSI - Issue 72

Andrii Ivaniuk et al. / Procedia Structural Integrity 72 (2025) 323–329

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edges of the crack for the corresponding crack lengths caused by the action of forces P . Data obtained at a force magnitude of P 1 = 15,75 kN for beam B1 with crack length 2 l = 3300 mm; at P 2 = 12,15 kN for beam B2 with 2 l = 3700 mm (Fig.3); at P 3 = 9,9 kN for beam B3 with 2 l = 4200 mm. Analyzing the distribution of tangential stresses τ x,y in section 1-1 (Fig.3), it should be noted that at different lengths the cracks have the same character.

Fig. 3. Distribution of tangential stresses along the height of beam 2 in sections 1-1 and 2-2

The distribution of normal stresses x  along the span length, acting on the upper and lower faces of the beam (Fig.3), are different in nature, and their maximum values are reached in the section along the middle of the span. Moreover, their values in this cross section are equal in absolute value.

x  along the length of beam B1: a) along the upper face; b) along the upper edge of the crack; c) along the lower edge of the crack; d) along the lower face

Fig. 4. Distribution of normal stresses