Open AccessDeveloping a method of low cycle fatigue life prediction for large-sized parts based on testing equivalent samples and applying it when improving gas turbine engine critical parts
Author(s) -
Alexandr Pakhomenkov,
S A Bukaty,
Yu. N. Shmotin
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1891/1/012032
Subject(s) - aero engine , structural engineering , low cycle fatigue , stiffness , gas turbines , stress (linguistics) , fatigue testing , stress–strain curve , turbine , mechanical engineering , engineering , materials science , automotive engineering , computer science , reliability engineering , finite element method , philosophy , linguistics
This paper presents the methodology of LCF equivalent tests based on the application of test samples whose stress-strain state (SSS) is similar to the stress-strain state of the part in its critical zone by using the stiffness coefficient of the stress-strain state. Requirements for manufacture of test specimens have been defined. This method was successfully tested on the example of a gas turbine engine LPC disk. The method was also used to improve the design of disk / blade root connection which resulted in a 3-fold increase of low cycle fatigue life of the disk. Method of equivalent testing is intended for prediction of cyclic fatigue life of critical large-sized parts full-scale tests of which are not possible or economically feasible.