Anisotropic Creep and Damage in Structural Elements Under Cyclic Loading*

Abstract

A method is described to calculate creep and damage in structural elements under cyclic loading. Materials exhibiting anisotropic creep-damage behavior are considered. The results of calculating the deformation and fracture of structural elements at a plane stress state are presented.

Determining the influence of irradiation swelling on creep and damage in elements with orthotropic material properties

“…It is characterized by a significant anisotropy of creep properties and the damage accumulation. The constants to the equations of state of this alloy (5), (6) in this temperature range are determined by experimental studies [13] and are given in [14]. They are equal to n=p=5, s=1: The direction of the axes of the Cartesian coordinate system of the estimation model (Fig.…”

“…To construct equations of creep state accompanied by damage, experimental results obtained for samples from titanium alloy VT1-0 were used [13,14]. The equation for the rate of irradiation swelling strains is formulated after the analysis of experimental data obtained for titanium alloys at high temperatures [5,6].…”

“…To system (2), it is necessary to add the equation of state. The equation of creep, accompanied by damage, obtained in [13,14], is applied:…”

“…, B  n, p, s are constants determined experimentally. Details of the numerical procedures applied to the determination of constants and components of property tensors under consideration can be found in [13][14][15].…”

“…A triangular finite element is used. After the transformations, the main system of ordinary differential equations with respect to the nodes of the finite-element model was built [2,14]:…”