Issue 51

M. M. Konieczny et alii, Frattura ed Integrità Strutturale, 51 (2020) 164-173; DOI: 10.3221/IGF-ESIS.51.13 171 C ONCLUSIONS ased on numerical calculations using the finite element method (FEM) and experimental research, the results that were obtained could be compared. The Figs. 8 - 10 present the values of the equivalent (von Mises) stresses σ red in the stress concentrated zones for a circular axisymmetric perforated plate, free supported and loaded with concentrated force P i applied in the geometric center of the plate, numerically and experimentally determined in eight measuring points and the difference between the results obtained methods δσ. Figure 9 : The course of equivalent stresses changes using the von Mises hypothesis for a circular axisymmetric perforated plate, free supported and loaded with concentrated force P i applied in the geometric center of the plate, numerically determined. Figure 10 : Percentage difference in equivalent stress variations δσ red according to von Mises hypothesis for a circular axisymmetric perforated plate, free supported and loaded with concentrated force P i applied in the geometric center of the plate, numerically and experimentally determined. The results of calculations indicate that the highest value of equivalent (von Mises) stress σ red occurred when the perforated plate was loaded with concentrated force Pi applied in the geometrical center of the plate with the value P 5 = 2510 N, both in the case of experimental research and numerical calculations. For example, in second zone Z2, the equivalent (von Mises) stress determined experimentally was equal to σ e red = 55.62 MPa, and the calculated numerically was equal to σ n red = 57.54 MPa (Fig. 7, zone 2). The relative difference in this case was 3.34%. In the Z8 eighth zone, the equivalent (von Mises) stress determined experimentally was equal to σ e red = 160.03 MPa, and the numerical calculated was equal to σ n red = 160.74 MPa (Fig. 7, zone 8). The relative difference in this case was 0.44%. The state of stress in the perforated plate free supported on the entire perimeter and loaded with a concentrated force P i applied in the geometric center of the plate determined by the finite element method (FEM) of the ANSYS program, can be considered sufficiently accurate for engineering calculations. B