Open AccessИспользование спекловых изображений для определения локальных пластических деформаций, возникающих при многоцикловой усталости стали 09Г2С
Author(s) -
А.П. Владимиров,
Н.А. Друкаренко,
К.Е. Мызнов
Publication year - 2021
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2021.15.51232.18752
Subject(s) - autocorrelation , materials science , radius , fracture (geology) , ultimate tensile strength , speckle pattern , limit (mathematics) , composite material , mathematics , mathematical analysis , physics , optics , statistics , computer security , computer science
Using time-averaged speckle images on a sample of 09G2S steel made with two recesses with a radius of 2.5 mm, the plastic deformations occurring in the fatigue crack origin zone are estimated. It is shown that fatigue fracture occurs due to the localization of irreversible processes in a region less than 1 mm in size, the limit value of tensile plastic deformations is of the order of 10-1. As a precursor of destruction it is proposed to use the reduction of the normalized time autocorrelation function of the radiation intensity to negative values.