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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The following restrictions are considered during simulation: – the crack propagates strictly orthogonally to the axis of the element and the stress state at its tip is determined only by the crack opening mode SIF К І ; – the influence of the crack on the nature of channel deformation is neglected (we consider that the thin walled element is constantly under the action of pure bending). The model of the I - beam is created using the built - in graphic editor Design Modeler . The global mesh of finite elements of model was generated by default ( Global mesh is Default ) with a finite element size of 25 mm ( Element size is 25 mm) using the option Patch Conforming Method with the parameters Method is Tetrahedrons , Algorithm is Patch Conforming (Fig. 4, a). Modeling of the edge crack was carried out on the basis of a rectangular body of zero thickness ( Surface Body ) with side dimensions δ 1 and L , which was implanted in the I - beam flange at the location of intended crack. The edge crack was modeled using the Arbitrary Crack tool of the Fracture module with the following parameters of the local finite element mesh: Local mesh : Mesh method is Tetrahedrons , Mesh Contours is 6, Largest Contour Radius is 2.5 mm, Growth Rate is 1.2 (Fig. 4, b).

a)

b)

Fig. 4. Modeling of I-beams with an edge transverse crack.

The length L of the crack was set in steps of 5 mm during propagation (from 0 to b /4 = 30 mm). The stress - strain state (deformations and stresses) of the beam with a crack of L = 30 mm is presented in Fig. 5.

a)

b)

Fig. 5. Deformations (a) and stress (b) in an I-beam with a crack L = 30 mm.