A fracture mechanics based approach for the fretting fatigue of aircraft engine fan dovetail attachments

Mangardich, Dikran; Abrari, Farid; Fawaz, Zouheir

doi:10.1016/j.ijfatigue.2019.105213

Cited by 34 publications

(17 citation statements)

References 34 publications

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“…This work studies the capability for an 'average' value of COF to characterize the evolution of the COF in the nucleation and propagation phases of the fretting crack. This work has been recently published in the International Journal of Fatigue, titled under 'A fracture mechanics based approach for the fretting fatigue of aircraft engine fan dovetail attachments' [35].…”

Section: Rotorsmentioning

confidence: 99%

On the Fatigue and Fracture of Bladed and Integrally Bladed Rotors of Aircraft Engine Compressors

Mangardich¹

2021

Preprint

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The fatigue and fracture for bladed and integrally bladed rotors (IBR) of aircraft engine compressors has been studied. For IBRs, a new distinct finite element technique was developed to model crack propagation under combined low cycle and high cycle fatigue loading. The crack trajectory, aspect ratio, and shape resulting from the method agreed very well with airfoils which fractured in service. The technique can be extended on other compressor disk applications. For bladed rotors limited by fretting fatigue, a unique fracture mechanics based methodology was developed for obtaining an evolved coefficient of friction (COF) resulting from fretting motion between the fan blade and hub. The predicted nucleation location, nucleation life, crack trajectory, shape and propagation life agreed well with the fractured components. The study confirms that the fretting-specific modified Smith-Watson-Topper (SWT) parameter more accurately predicts the nucleation location and life of the crack compared to the plain fatigue SWT parameter.

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Section: Rotorsmentioning

confidence: 99%

On the Fatigue and Fracture of Bladed and Integrally Bladed Rotors of Aircraft Engine Compressors

Mangardich¹

2021

Preprint

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“…The low-cycle strain fatigue demonstrates a typical feature in which plastic deformation occurs before the fatigue failure of metallic materials. However, the high-cycle stress fatigue usually results in elastic deformation, and the dislocation density does not significantly increase [30][31][32]. Figure 19 shows the scanning electron microscope (SEM) photographs of the fracture of the broken aluminum wire in the Level 6 wind simulation experiment.…”

Section: Surface Yield Line Of Aluminum Wiresmentioning

confidence: 99%

Research on Failure Mechanisms of Broken Strands of Jumper Wires for EHV Transmission Lines in Strong-Wind Areas

Han

Yongjie

et al. 2019

Metals

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The jumper wires of an extra-high voltage (EHV) transmission line in strong-wind areas in Northwest China frequently break down. We installed some acquisition devices to collect the data of the jumper wires and wind speed in the fault area of one 750-kV transmission line. We also developed a swing simulation machine based on the collected data. The machine could simulate the swing condition of the jumper wires under various wind speeds. We analyzed the broken aluminum wires obtained from the simulation experiment of jumper wires. Yield lines appeared on the surface of the broken aluminum wires in the simulation experiment. Proliferation of dislocation and grain deformation occurred in the broken aluminum wires using transmission electron microscopy observation. The results show that the aluminum wires in the experiment under a Level-6 wind and above were in a full yield state and demonstrated strain-fatigue failure condition. The fracture of the broken aluminum wires showed distinct strain-fatigue fracture characteristics using the scanning electron microscope fracture morphology analysis. From the combination of the abovementioned research, we conclude that the failure mechanism of the broken strands of the jumper wires of the EHV transmission line in the strong-wind area is mainly a strain-fatigue failure mechanism.

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“…6,7 The dovetail in turbine engines is one of the typical constructions under fretting damage. [8][9][10][11][12] It remains a research hotspot in structural integrity so far because of its complexity and coupling of varying surface friction, fretting wear, and other factors mentioned above. Especially for engineering design, the fretting fatigue assessment based on conventional fatigue models becomes difficult due to local extreme stress concentrations and complex constitutive behavior.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational investigation of fretting fatigue characterized by nominal contact pressure in dovetail structures

Guo

Li²,

Cao³

et al. 2022

Fatigue Fract Eng Mat Struct

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The present work is aimed at establishing an engineering design method for fretting fatigue based on experimental and computational investigation of dovetail structures made of nickel‐based superalloy. Severe stress gradients and surface wear damage make fretting fatigue difficult to be assessed based on conventional fatigue life models. With the help of detailed experimental investigations and finite element computations, a fretting fatigue life model based on the nominal pressure on the dovetail contact surfaces was related to the nonlocal multiaxial fatigue analysis. The derived fretting design method based on the nominal pressure shows a life prediction distribution within the double‐scatter band and agrees with experiments fairly well. The present model provides an efficient and easy‐to‐use design method for engineering applications.

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A fracture mechanics based approach for the fretting fatigue of aircraft engine fan dovetail attachments

Cited by 34 publications

References 34 publications

On the Fatigue and Fracture of Bladed and Integrally Bladed Rotors of Aircraft Engine Compressors

On the Fatigue and Fracture of Bladed and Integrally Bladed Rotors of Aircraft Engine Compressors

Research on Failure Mechanisms of Broken Strands of Jumper Wires for EHV Transmission Lines in Strong-Wind Areas

Experimental and computational investigation of fretting fatigue characterized by nominal contact pressure in dovetail structures

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