A Three Dimensional Finite Element Analysis for Contact Stress and Fatigue near the Fir-Tree Region in a Gas Turbine Blade

Navad, Ganesh R; Marakala, Narasimha; Karanth, Vasudeva K; Sharma, Yagnesh N

doi:10.9734/bjast/2015/17442

Cited by 1 publication

(1 citation statement)

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“…Researches in literature [40][41][42] have shown that several discontinuities near the contact area in the fir-tree tenon structure are key positions in failure analysis of a disc-blade attachment system. A suitable fatigue constitutive model is necessary for contact fatigue analysis, which effectively exhibits and describes the cyclic elastoplastic fatigue behavior of materials.…”

Section: Fatigue Constitutive Modelmentioning

confidence: 99%

Contact stress analysis and fatigue life prediction of turbine disc–blade attachment with fir‐tree tenon structure

Yuan

Liao

Zhu

et al. 2021

Fatigue Fract Eng Mat Struct

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Fir‐tree tenon structure, as a commonly used scheme in the connection of turbine blades and discs, plays a critical role in the reliability and integrity of aeroengine turbines. This work mainly deals with the contact and fatigue analyses of a turbine disc–blade attachment with fir‐tree tenon structure. Firstly, based on Hertz contact theory, a three‐dimensional (3D) model of surface‐to‐surface contact is established, and contact stress analysis is performed based on finite element (FE) simulations. The simulated contact stress distribution agrees well with the Hertz contact theory. Particularly, the rounding processing does not relieve the stress concentration. Then, contact stress analysis on the fir‐tree tenon structure is performed, and a stress gradient‐based model is utilized for fatigue life evaluation together with contact stress analysis. Results show that the proposed solution yields acceptable predictions compared with field estimations.

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Section: Fatigue Constitutive Modelmentioning

confidence: 99%