Abstract
The paper presents an analysis of variations in the stress intensity coefficient (SIC) in plates with different sizes of the cross-section, with and without concentrators. We also analyze the dependence of the SIC maximal value on the size of the smallest section of a plate with stress concentrator. SIC of smooth specimens and specimens with stress concentrator in the form of a semicircular notch are calculated using the ANSYS finite- element analysis program system. The static elastic problem is solved, with the strained state taken to be biaxial. The material of the plate is considered to be isotropic. The plates under consideration with a concentrator in the initial area of the crack size increase show maximum stress intensity coefficient. In plates without concentrator the SIC changes smoothly over the whole area of the crack size increase. It is established that the crack size is equal to 0.02 of the plate smallest size at the maximal value of the stress intensity coefficient. The study conducted confirms the feasibility of using the criterion of average integral residual stresses to calculate the increase of the endurance limit of surface- hardened specimens and parts with concentrators due to compressive residual stresses.
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