Research of the stress state of an element of a thick-wall pipeline under conditions of power and corrosion effect

Abstract

The stress state of an element of a thick-walled pipeline is studied under conditions of power and corrosion effect in the statement of plane deformation. The material of the element under the influence of external loads goes into an elastic-plastic state. The corrosive effect of the pumped medium leads to softening of the material in the plastic zone. This softening of the material is taken into account by a special inhomogeneity function in the Tresca-Saint-Venant plasticity condition. The elastic-plastic problem in the axisymmetric setting (uniform pressure) and non-axisymmetric setting (non-uniform external pressure along the contour) is considered. The problem is solved by the method of sharing static and physical equations for the considered elastoplastic material and the perturbation method in the theory of an elastoplastic body. An assessment of the strength and bearing capacity of a thick-walled element under corrosive force effect is given.

Keywords

• thick-wall element
• elastoplastic state
• corrosion damage to the material
• plastic inhomogeneity
• softening function