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Conception of cycle life additivity and its application for determining the resource of aero engine disks
- Authors: Tumanov N.V.1, Lavrentyeva M.A.1
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Affiliations:
- Central Institute of Aviation Motors
- Issue: Vol 13, No 5-1 (2014): Special Issue
- Pages: 9-17
- Section: ISSUE WITHOUT SECTION
- URL: https://journals.ssau.ru/vestnik/article/view/2474
- DOI: https://doi.org/10.18287/1998-6629-2014-0-5-1(47)-9-17
- ID: 2474
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Abstract
Taking into account the universal character and high energy intensity of the mechanism of low cycle fatigue (LCF) crack stable growth which ensures a long safety period for the growth of such cracks a conception of cycle life additivity is proposed. According to the conception the cycle life of an aero engine disk is determined up to the limiting state connected with the transition of a LCF crack to unstable growth in the critical area of a disk. The cycle life prior to the first overhaul is calculated by adding the life cycle before the crack origination and that of stable crack growth (survivability resource); the overhaul period is determined by the survivability resource. The latter is also the lower bound of the disk life at the design stage. To estimate the overhaul period we suggest using survivability diagrams representing the dependence of LCF crack stable growth in the critical area of the disk on the size of the crack. Methods of constructing survivability diagrams have been developed for simple and complex loading cycles. Examples of applying the conception for the estimation of cycle life of aero engine disks made of wrought and powder alloys are presented.
About the authors
N. V. Tumanov
Central Institute of Aviation Motors
Author for correspondence.
Email: tumanov@rtc.ciam.ru
Candidate of Science (Engineering)
Head of Sector
Russian FederationM. A. Lavrentyeva
Central Institute of Aviation Motors
Email: psn@ciam.ru
Leading Designer
Russian FederationReferences
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