Lifetime assessment for an ideal elastoplastic thick-walled spherical member under general mechanochemical corrosion conditions

The problem of the equal-rate mechanochemical wear of an elastic-perfectly plastic thick-walled spherical shell under internal and external pressure is solved analytically. The proposed solution allows to assess the time of the initial yielding at the bore of the shell and the time of fully plastic yielding. The obtained formulas are to be used for design purposes and as a benchmark solution for numerical analysis

On local strength of a spherical vessel with pits distributed along the equator

The effect of multiple shallow corrosion pits on the strength of a spherical vessel subjected to internal pressure is studied. The pits are considered both randomly and evenly distributed along the equator on the outer surface of the vessel. The dependencies of the stress concentration factor on the number of the pits are compared for linearly elastic and elastic-plastic material with hardening. The behavior of the vessels made of elastic and elastoplastic materials turns out to be qualitatively different. The approximation of periodic pits arrangement is discussed

Thermoelastic stress analysis for a tuve under general mechanochemical corrosión conditions

This work deals with the uniform surface mechanochemical corrosion of an elastic thick-walled long cylindrical tube subjected to internal and externa! pressure of environments at different temperatures. The rate of uniform corrosion is supposed to be linear with the stress and inversely as the exponent of time. The problem is then reduced to the first-order ordinary differential equation in a tube cross-sectional size. Analytical solutions of this equation are found. To determine the tube lifetime and the cause of its failure, the method based on various estimating functions is proposed. The algorithm for environmental contamination by corroded material is developed

Lifetime assessment for an ideal elastoplastic thick-walled spherical member under general mechanochemical corrosion conditions

The problem of the equal-rate mechanochemical wear of an elastic-perfectly plastic thick-walled spherical shell under internal and external pressure is solved analytically. The proposed solution allows to assess the time of the initial yielding at the bore of the shell and the time of fully plastic yielding. The obtained formulas are to be used for design purposes and as a benchmark solution for numerical analysis