PSI - Issue 59

Mykola Pidgurskyi et al. / Procedia Structural Integrity 59 (2024) 322–329 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 2. Correction function F(L) based on series of points obtained from mathematical model.

In order to verify the results obtained on the basis of the proposed engineering methods for determining SIF, we will compare them with the results of computer simulation of crack development in the thin-walled cross-section of the channel, obtained by finite element method (FEM). To obtain reliable results in the simulation modeling of the stress-strain state of a thin-walled element with a crack by finite element method, it is necessary to ensure the construction of an adequate model of the edge crack with a correct mesh of finite elements. This task can be implemented by a number of specialized computer software, the most common of which is the software package ANSYS Workbench (Lee (2019)). For simulation of edge crack development in a thin-walled channel-type element, in order to study the stress intensity factor (SIF) at the tip of the edge transverse crack propagating in the I-beam under pure bending, the tools of Fracture option of Mechanical software package in ANSYS Workbench were used. The edge crack was modeled in the flange of an I-beam 25B1 with length 1000 mm and cross-section dimension 248×124×8(5) mm under the action of a bending moment M = 25 kN ∙ m (Fig. 3, a), which creates normal stresses σ ≈ 90 MPa in the defect-free profile of the I-beam (Fig. 3, b).

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b)

Fig. 3. Scheme of loading and deformation of the simulated sample.