Prediction of Longevity of Constructions with Surface Defects when Designing the Systems for Lowering the Toxicity of Burnt Gases

Abstract

When designing the systems for toxicity lowering of burnt gases, the determining factor for the prediction of the resource of the system is a correct determination
of longevity of elements of the system. A problem of calculating for strength of the construction, which represents a cylindrical shell reinforced by rigidity edges
and situating under the internal pressure, is considered. A surface defect is arranged on an internal shell side. A procedure for the calculation of longevity of the
construction allowing for the surface defect is developed for the case of cyclic loading. The values of longevity were found numerically by the specified dimensionless
initial and critical sizes of the crack. It is established that when allowing for the surface defect of the construction in the case of cyclic loading, the number
of operational cycles decreases by 12–16%. The proposed procedure makes it possible to predict the service life of the system for lowering the toxicity at its
designing stage allowing for the surface defects under the cyclic loading.