Interrelation and kinetics of matersals fatigue damage under strain- and stress-control loading modes
Journal Title: Вісник Тернопільського національного технічного університету - Year 2017, Vol 88, Issue 4
Abstract
In the article the calculating estimation of fatigue damage and plasto-elastic stress-strain state (SSS) kinetics of steels under the “rigid” cyclic loading modes using the ultimate exhaustion of cyclic plasticity (UECP) model is presented. To do this the previously developed method of fatigue damage summation, which allows to calculate the kinetics of fatigue damage under irregular cyclic loading, was used. The difference in the accumulation of fatigue damage and the kinetics of elastic-plastic SSS for two “rigid” cyclic loading modes (total and inelastic strains control loadings) are shown on the example of two materials: cyclically hardening steel 45 and cyclically softening steel 1Х2М. Besides, calculations with help of the UECP model show, that for the materials with cyclic inelastic strain instability during cyclic loading fatigue damage summation rate is significantly different as compared with the same obtained by the linear summation hypothesis. The results presented can be used for calculating lifetime estimation of structural elements operating under “rigid” loading modes with a higher accuracy as compared with the use of both stabilized values of inelastic strains and well-known fatigue damage summation hypotheses. This is due to the fact, that the proposed calculative UECP model describes the difference in fatigue damage accumulation under variable cyclic load amplitudes for the materials with different kinetics of inelastic strains. In its turn, it makes possible to substantiate theoretically the necessity of taking into account the inelastic strain kinetics peculiarities under the “rigid” loading modes and to describe the difference and nonlinear nature of fatigue damage accumulation under these loading modes for the specified groups of materials.
Authors and Affiliations
Andrii Novikov, Georgiy Tsyban’ov
Keywords
Related Articles
- EP ID EP280341
- DOI 10.33108/visnyk_tntu2017.04.035
- Views 63
- Downloads 0
The study of technologies to improve physical-mechanical and chemical properties of reaction sintered ceramic materials on the basis of silicon carbide
The ways of improving physical-mechanical and chemical properties of reaction-sintered ceramic materials based on silicon carbide are described. Various means of processing ceramic materials are studied and analysed. The...
Cyber-physical model of the immunosensor system in a rectangular lattice with the use of lattice difference equations of population dynamics
The article developed a cyber-physical model for immunosensory systems. The main attention is paid to the mathematical description of the discrete dynamics of populations in combination with dynamic logic, which is used...
Constructive damping in the conical holder with an elastic filler
Operation of all machines and mechanisms is directly related to arising of vibrations. In the majority of cases vibrations worsen durability, reliability and longevity of industrial machines, mechanisms and buildings; th...
Wave propagation in the pre-deformed compressible elastic layer interacting with a layer of viscous compressible liquid
Based on three-dimensional equations of linearized elasticity theory for finite deformations of elastic body and three-dimensional linearized Navier-Stokes equations for the liquid medium, the problem of propagation of a...
Optimization of bernoulli gripping device’s orientation under the process of manipulations along direct trajectory
There was appointed the task to define the optimal orientation of bernoulli gripping device aiming to minimal consumption of compressed air under given parameters of bernoulli gripping device, manipulation object and tra...