Issue 55

M. M. Konieczny et alii, Frattura ed Integrità Strutturale, 55 (2021) 241-257; DOI: 10.3221/IGF-ESIS.55.18

 C and r C in the analyzed plate are respectively:

Cross-section weakening coefficients (4)

     0.590 C ;

    0.496 r C ;

Data as in the above case were adopted for the calculations. On the other hand, the mechanical properties of the steel plate and the titanium plate were taken from Tab. 1. On the basis of the Eqns. (10) – (15), values of radial stresses  a r and circumferential   a and equivalent von Mises stresses  a red were determined for the adopted geometry of the bimetallic perforated plate given in Fig. 6. For example, in Fig. 7 the values of the circumferential stress   a , radial stress  a r and equivalent von Mises stresses  a red are plotted along the thickness h of the bimetallic perforated plate in sections T 1 and T 2 , i.e. on the radius r = R 5 = 60 mm and r = 130 mm (Fig 2), loaded from the side of the titanium layer with a concentrated force applied perpendicularly to the center of the plate P = 10 kN.

a ,  a

r , and  a

 

Figure 7. Stress distribution, respectively:

red in the cross-section of a bimetallic perforated plate fixed and loaded with

5 R = 60 mm; b) in the section T 2 on radius r =

a concentrated force with the value P = 10 kN: a) in the section T 1 on the radius r =

130 mm (Fig. 2).

N UMERICAL METHOD he subject of numerical calculations was the stress distribution in a bimetallic circular perforated plate, in the first case freely supported (Fig. 4) and in the second case fixed (Fig. 6) and loaded with a concentrated force applied perpendicular to the center of the plate. The free support of the plate was realized by designing a ring support on which a bimetallic perforated plate was placed. Minimal friction contact is applied between the plate and the support. On the other hand, the plate was fixed by removing all degrees of freedom from the finite elements located on the outer contour of the perforated plate. T

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