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Research Papers: Gas Turbines: Structures and Dynamics

A Method to Analyze the Contact Stress of Dovetail Attachments in Aeroengine

[+] Author and Article Information
Shuo Zhang

School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: 841681288@qq.com

Xiuli Shen

School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: dshj0321@163.com

Shaojing Dong

School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: shxl606@163.com

Ye Zhang

AECC Commercial Aircraft Engine Co.,Ltd.,
Shanghai 201103, China
e-mail: 15776997@qq.com

Wentong Hu

School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: kklt7072@163.com

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 11, 2018; final manuscript received June 20, 2018; published online October 26, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(2), 022505 (Oct 26, 2018) (10 pages) Paper No: GTP-18-1163; doi: 10.1115/1.4040684 History: Received April 11, 2018; Revised June 20, 2018

Finite element method (FEM) has been used to find out the fundamental reason of shape function due to the nonconvergence of stress in calculating the trapezoidal tooth dovetail attachments of aeroengine. We have used two different methods, representing actual models, for the calculation of contact stress. Comparative analysis of these methods, and the already reported ones, led us to conclude that the displacement extraction method is better and efficient for the engineering applications. This method was successively applied to contact model of indenter with shaped edge, a model with an inclined contact surface and dovetail attachment model, while these stress results are compared with that of photoelastic. Moreover, we found that the photoelastic and displacement error in extraction method is small and the method can be widely used for the calculation of structural stress with sharp edge.

Copyright © 2019 by ASME
Topics: Stress , Displacement
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References

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Figures

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Fig. 1

Trapezoidal tooth dovetail attachment

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Fig. 2

Arc tooth dovetail attachment

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Fig. 3

Indenter with shape corner

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Fig. 4

Model for analytic solution

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Fig. 5

Stress at point A varies with mesh refinement

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Fig. 6

Penetration at point A and O with mesh refinement

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Fig. 7

(a) Convergence analysis for Ux and (b) convergence analysis for Uy

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Fig. 8

Four-node rectangular element

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Fig. 9

(a) X-component of Strain at point A with mesh refinement. (b) Y-component of Strain at point A with mesh refinement. (c) X-component of Stress at point A with mesh refinement. (d) Y-component of Stress at point A with mesh refinement.

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Fig. 10

Schematic diagram of shape function fitting displacement

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Fig. 11

(a) Variation of displacement of point A(No.1-8) and (b) variation of displacement of point A(No.5-8)

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Fig. 12

Actual model and mathematic model

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Fig. 13

Contact model with a small rounded edge

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Fig. 14

Partially enlarged mesh for adaptive h-mesh refinement

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Fig. 15

Contact model with a rounded edge

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Fig. 16

Contact pressure distribution

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Fig. 17

(a) Fitting function of Ux and (b) fitting function of Uy

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Fig. 18

Isochromatic of photoelastic

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Fig. 19

Distribution of shear stress

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Fig. 20

Distribution of contact stress of photoelastic

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Fig. 21

The fringe value under green light

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Fig. 22

Stress field of tenon using displacement extraction method

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Fig. 23

Stress field of whole model using contact algorithm

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Fig. 24

Stress field of tenon using contact algorithm

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