Abstract
The numerical calculations of the state of reduced stress in the plate with the slot at the biaxial load made it possible to determine areas of stress concentration around the top of the aperture. It was shown that the highest of reduced stress concentration occurred in the plate with both an elliptical and flat slot, when the slope longer axis forms of the slot an angle of 45° for a biaxial load, i.e. extension Pz = 300 kN and compression Py = −300 kN. The concentration of reduced stress factor k depending on the method of plate load and the angle of inclination of the slot was from 2.53 to for the elliptical slot and from 3.26 to 5.18 for the flat slot. Significant values reduced stress concentration in the top area of the slot are usually the cause of micro cracks, which under the influence of variable loads may initiate the propagation of fatigue cracks and lead to the destruction of the machine element.
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