Constraint Related Fatigue Crack Initiation Life of GH4169 Superalloy

doi:10.11900/0412.1961.2022.00099

Acta Metall Sin

2022, Vol. 58

Issue (12): 1633-1644 DOI: 10.11900/0412.1961.2022.00099

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Constraint Related Fatigue Crack Initiation Life of GH4169 Superalloy

GUO Haohan¹, YANG Jie¹(

), LIU Fang², LU Rongsheng³

^1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
^2.School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
^3.Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Cite this article:

GUO Haohan, YANG Jie, LIU Fang, LU Rongsheng. Constraint Related Fatigue Crack Initiation Life of GH4169 Superalloy. Acta Metall Sin, 2022, 58(12): 1633-1644.

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Abstract

Nickel-based GH4169 superalloy is used as turbine disc material in aeroengines because of its good oxidation resistance, good formability, weldability, and high strength. However, turbine disc fatigue failure will inevitably occur in onerous service environments and after a long operation time. To ensure the safety and reliability of aeroengines, the fatigue damage behavior and fatigue life of GH4169 superalloy need to be studied. Constraint is an important factor affecting the fatigue fracture behavior of materials, because changing it will impact the fatigue behavior. To achieve a long service life and high reliability of aeroengines, fatigue and constraint effects must be researched. However, there are only limited studies on the effect of constraint on fatigue crack initiation time. In this study, a crystal plasticity constitutive model based on low cycle fatigue rate correlation was applied to the GH4169 superalloy. Two fatigue indicators, namely the cumulated energy dissipation and cumulated plastic slip, were introduced as fatigue crack initiation criteria to study the fatigue crack initiation time for different micro-notch depths and lengths. In addition, the relationship between constraint and fatigue crack initiation life was further investigated using the unified constraint parameter A_p. The results showed that both cumulated energy dissipation and cumulated plastic slip can accurately predict the fatigue crack initiation time. With the increase in micro-notch depth, the fatigue crack initiation time decreased, while it increased with the increase in micro-notch length. A linear relationship between the fatigue crack initiation time and $A p$ under different micro-notch depths and lengths was observed. Based on this relationship, the constraint related to the fatigue crack initiation time can be determined.

Key words: constraint fatigue crack initiation life crystal plasticity cumulated energy dissipation cumulated plastic slip

Received: 07 March 2022

ZTFLH:

TH114

Fund: National Natural Science Foundation of China(51975378);Shanghai Pujiang Program(21PJD047)

About author: YANG Jie, associate professor, Tel: (021)55272320, E-mail: yangjie@usst.edu.cn

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00099 OR https://www.ams.org.cn/EN/Y2022/V58/I12/1633

Fig.1 A representative volume element (RVE) of GH4169 nickel base superalloy

Fig.2 Schematic of model loading and geometry (a—micro-notch depth, b—micro-notch length, RP—reference point)

Fig.3 Stress-strain curves and plastic slips based on three different mesh sizes

Fig.4 Accumulated energy dissipation illustrations of models with different micro-notch depths when the strain amplitude $Δ ε t$ = 0.6% and the cycle number is 10 cyc (unit: MJ/m³)
(a) a = 15 μm (b) a = 45 μm
(c) a = 75 μm (d) a = 105 μm

Fig.5 Relationships between accumulated energy dissipation and cycle number
(a)

Δ ε t

= 0.6% (b)

Δ ε t

= 0.8% (c)

Δ ε t

= 1.0%

Fig.6 Hysteresis loops of the point at the lower left corner of the micro-notch at $Δ ε t$ = 0.6% and the 10th cycle

Fig.7 Accumulated plastic slip illustrations of models with different micro-notch depths when $Δ ε t$ = 0.6% and the cycle number is 10 cyc
(a) a = 15 μm (b) a = 45 μm (c) a = 75 μm (d) a = 105 μm

Fig.8 Relationships between accumulated plastic slip and cycle number
(a)

Δ ε t

= 0.6% (b)

Δ ε t

= 0.8% (c)

Δ ε t

= 1.0%

Fig.9 Comparisons of predicted fatigue crack initiation life based on accumulated energy dissipation and accumulated plastic slip

Fig.10 Accumulated energy dissipation illustrations of models with different micro-notch lengths when $Δ ε t$ = 0.6% and the cycle number is 10 cyc (unit: MJ/m³)
(a) b = 15 μm (b) b = 45 μm (c) b = 75 μm (d) b = 105 μm

Fig.11 Relationships between accumulated energy dissipation and cycle number
(a)

Δ ε t

= 0.6% (b)

Δ ε t

= 0.8% (c)

Δ ε t

= 1.0%

Fig.12 Hysteresis loops of the point at the lower left corner of the micro-notch at $Δ ε t$ = 0.6% and the 10th cycle

Fig.13 Accumulated plastic slip illustrations of models with different micro-notch lengths when $Δ ε t$ = 0.6% and the cycle number is 10 cyc
(a) a = 15 μm (b) a = 45 μm (c) a = 75 μm (d) a = 105 μm

Fig.14 Relationships between accumulated plastic slip and cycle number
(a)

Δ ε t

= 0.6% (b)

Δ ε t

= 0.8% (c)

Δ ε t

= 1.0%

Fig.15 Comparisons of predicted fatigue crack initiation life based on accumulated energy dissipation and accumulated plastic slip

Fig.16 Relationships between fatigue crack initiation life and constraint
(a) different micro-notch depth
(b) different micro-notch length

Fig.17 Relationship between fatigue crack initiation life and constraint of all models

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