PSI - Issue 50

N. Mullahmetov Maksim et al. / Procedia Structural Integrity 50 (2023) 200–205 Mullahmetov Maksim N. et al./ Structural Integrity Procedia 00 (2022) 000 – 000

203

4

Additionally, numerical simulation of the deformation processes of the studied samples 6-10 was carried out in the ANSYS Workbench program. The finite element meshes for the calculations are shown in figure 4. In this case, a fine mesh was used with an element size of 0.2 mm in the critical region of the notch apex to ensure at least 5 elements within the critical distance. This partitioning is sufficient to obtain accurate stress/distance information in critical areas.

Fig. 4. Finite element meshes of computer models of samples The mechanical characteristics (Young's modulus and Poisson's ratio) for numerical models were obtained by testing specimens in the form of strips without a stress concentrator. 3. Results and discussions Table 1 shows the results of the experiments. It reflects the maximum load values, as well as the stress that occurs in the area of the minimum cross-sectional area.

Table 1. Tensile test results for STEF fiberglass samples

specimen

Max. load, kN

Ratio max. load to the minimum area, MPa

№

1 2 3 4 5 6 7 8 9

Strip Strip Strip Strip Strip

30.8 30.7 30.7 30.7 29.8 25.4 25.1 21.2 25.8 29.5

330.2 339.9 330.1 327.9 319.7 273.7 270.0 223.7 272.8 310.7

V-shaped 15x5 V-shaped 15x3 V-shaped 15x1 V-shaped 4x1 V-shaped 1x1

10

The results of numerical simulation were used to analyze the strength characteristics according to the theory of critical distances. To do this, linearized principal stresses were obtained in the region of the stress concentrator. The