Open AccessStudying of accumulation damages regularities under low cycle loading and cycle variable parameters conditions
Author(s) -
A. V. Lykova,
A V Ilinikh
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/747/1/012122
Subject(s) - low cycle fatigue , structural engineering , durability , nonlinear system , hysteresis , fatigue testing , work (physics) , stress (linguistics) , variable (mathematics) , state variable , materials science , mechanics , mathematics , engineering , mechanical engineering , composite material , thermodynamics , physics , mathematical analysis , linguistics , philosophy , quantum mechanics
The aim of the work is to study the possibilities of predicting cyclic durability in low-cycle fatigue and variable cycle parameters conditions, which combination describes the change complex nature in the stress-strain state over time of aircraft engine parts, based on linear and nonlinear models of damage accumulation. To do this, low-cycle fatigue tests of cylindrical samples were carried out for various loading forms, consisting of several simple-shape cycles. On the results of the tests carried out, fatigue life was predicted based on the nonlinear hypothesis of the Marco-Starkey damage accumulation. An analysis of the mechanical hysteresis loops was carried out to estimate the reasons for the increase of life during tests with a large number of groups in blocks.