COMPUTER SIMULATIONS OF STATIC STRESS-STRAIN STATES FOR LONG-LENGTH PRESSURISED PIPES WITH EXTERNAL PROTECTIVE THIN NANOENGINEERED COATING UNDER NONUNIFORM TEMPERATURE FIELDS

Abstract

Influence of nonhomogeneous temperature fields on the stress-strain state of the pressurized pipes is due to temperature dependencies of the structural material properties like Young's module, Poisson's ratio and linear expansion coefficient, so that the nonuniform temperature fields leads to the inhomogeneous of the material properties. It is proposed to use the differential equations formulated through the displacement and the stresses to consider the stress-strain state for axisymmetric long-length pipes with external protective thin nanoengineered coating taking into account the nonuniform temperature fields. The finite differences are used to make the computer simulations of the pipes with the external protective thin nanoengineered coating, and the cladding of nuclear fuel rods made from the Zr-based alloy with the thin protective coating made from the stainless steel is considered as the example. It is shown that consideration of structural material properties temperature dependencies can have the noticeable influence on the stress-strain-state estimations for the pressurized pipes with external protective thin nanoengineered coating under nonuniform temperature fields.