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Creep life assessment of aero-engine recuperator based on continuum damage mechanics approach

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Abstract

The creep life of an aeroengine recuperator is investigated in terms of continuum damage mechanics by using finite element simulations. The effects of the manifold wall thickness and creep properties of brazing filler metal on the operating life of the recuperator are analyzed. Results show that the crack initiates from the brazing filler metal located on the outer surface of the manifold with the wall thickness of 2 mm and propagates throughout the whole region of the brazing filler metal when the creep time reaches 34900 h. The creep life of the recuperator meets the requirement of 40000 h continuous operation when the wall thickness increases to 3.5 mm, but its total weight increases by 15%. Decreasing the minimum creep strain rate with the enhancement of the creep strength of the brazing filler metal presents an obvious effect on the creep life of the recuperator. At the same stress level, the creep rupture time of the recuperator is enhanced by 13 times if the mismatch between the minimum creep rate of the filler and base metal is reduced by 20%.

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Abbreviations

A, q :

Material constants in the Liu—Murakami damage evolution model

B :

Coefficient in the secondary creep stage

B 0, m :

Coefficients in the primary creep stage

c :

Diffusion exponent in material properties

D :

Inner diameter of the manifold

L :

Length of the manifold

M :

Initial material properties

Mat :

Material properties of the diffusion zone

n 0, n :

Stress exponents in the primary and secondary creep stage, respectively

p :

Rupture stress exponent in stress-based models

S :

Wall thickness of the manifold

S ij :

Deviatoric stress

y :

Thickness of the diffusion zone

ω :

Damage state parameter ranging from 0 to 1

α :

Material constant of multiaxiality ranging from 0 to 1

ε c :

Creep strain

ε e :

Elastic strain

ε p :

Plastic strain

ε th :

Thermal strain

ε total :

Total strain

\({\dot \varepsilon _{\min}}\) :

Minimum creep strain rate

σ eq :

von Mises stress

σ 1 :

Maximum principal stress

σ r :

Reference stress under multiaxial creep (equivalent stress)

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Acknowledgements

The work was supported by the National Natural Science Foundation of China (Grant No. 51675181). The authors are also grateful for the Innovation Program of Shanghai Municipal Education Commission, China (Grant No. 2019-01-07-00-02-E00068).

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Authors and Affiliations

  1. Key Laboratory of Pressurized System and Safety, MOE, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

    Pengpeng Liao, Yucai Zhang, Guoyan Zhou, Xiancheng Zhang & Shantung Tu

  2. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266555, China

    Yucai Zhang & Wenchun Jiang

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  1. Pengpeng Liao
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  2. Yucai Zhang
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  3. Guoyan Zhou
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Correspondence to Guoyan Zhou or Shantung Tu.

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Liao, P., Zhang, Y., Zhou, G. et al. Creep life assessment of aero-engine recuperator based on continuum damage mechanics approach. Front. Mech. Eng. 17, 46 (2022). https://doi.org/10.1007/s11465-022-0702-6

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