Evaluation of the structures metal damage under the static and cyclic loadings according to the coersive force value
Journal Title: Вісник Тернопільського національного технічного університету - Year 2018, Vol 89, Issue 1
Abstract
The results of experimental investigations of the damage degree of the ferromagnetic steel 05kp and austenitic (paramagnetic in the initial state) steel АISI 304 under the static and cyclic loading according to the coercive force (Нс) value are presented. The stages of the processes of the damage accumulation are determined: the growth of the coercive force values corresponds to the elastic-plastic strain ( crack initiation stage ), and the decrease of their values is caused by the failure of the metal solidity caused by the formation of pores and cracks ( crack development stage ). Identification of the damage accumulation stages by changing the direction of the coercive force kinetics after a certain number of run cycles allows us to construct a curve of irreversible damage ( the French line type ) and to evaluate the cyclic durability not according to the fatigue curve (destruction) of the metal, as it is considered in engineering, but at the stage of the crack initiation, which significantly reduces the risk of destruction. The obtained results can be the basis for the development of new approaches to the rapid assessment of the residual life of the structures metal by a simple non-destructive method.
Authors and Affiliations
Oleksii Gopkalo, Gennadii Bezlyudko, Volodymyr Nekhotiashchiy
Keywords
Related Articles
- EP ID EP289521
- DOI 10.33108/visnyk_tntu2018.01.019
- Views 58
- Downloads 0
Research and analysis od the defects of operational the rolling bearings based on the use of lubricants
With the use of the developed laboratory setting, the researches of noise diagnostic characteristicsof the rolling bearings with the useof lubricants by the Peak-factormethod have been conducted and with thecomparison of...
Features of statistical data processing at insulation testing of enameled electric wires
The necessity of checking of variation series of voltage by insulation breakdown of enameled wire for the sharply differing values from statistical laws is substantiated. The need for additional research of causes of abn...
Methodology of development and architecture of ontooriented system of electronic learning of Chinese image medicine on the basis of training management system
The work is devoted to solving the problem of the lack of a qualitative electronic training course on Chinese Image Medicine and analysis of the main tasks related to the sphere of knowledge management: content preparati...
The influence of thermal treatment in the hydrogen environment on the iron-cobalt alloy magnetostriction
Magnetic properties of materials are divided into two groups – the dependent and independent on the material structure. Magnetostriction is a characteristic that depends on both of these factors and can be both in ferrom...
Methodology for the experimental research of reinforced cylindrical shell forced oscillations
In the paper the methodology for experimental studies of forced oscillations of a horizontally oriented cylindrical shell which is reinforced from the inside by stringers and bulkheads using the servo-hydraulic test mach...