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Metals 2019, 9(2), 255; https://doi.org/10.3390/met9020255

Multiaxial Fatigue Life Prediction of GH4169 Alloy Based on the Critical Plane Method

1
School of Mechanical and Electronical Engineering, LanZhou University of Technology, Lanzhou 730050, China
2
Gansu construction vocational technical college, Lanzhou 730050, China
*
Author to whom correspondence should be addressed.
Received: 14 January 2019 / Revised: 12 February 2019 / Accepted: 15 February 2019 / Published: 20 February 2019
(This article belongs to the Special Issue Metal Fracture Modeling)
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Abstract

The multiaxial fatigue life of GH4169 alloy was predicted based on the critical plane method. In this paper, a new critical plane-damage multiaxial fatigue parameter is proposed, in which the maximum shear strain is considered to be the main damage control parameter, and the correction parameter, including the normal stress and strain of the maximum shear strain plane, is defined as the second control parameter. The axis of principle strain rotates under non-proportional loading. Meanwhile, the mechanism of the variation of material microstructure and slip systems leads to an additional hardening phenomenon. The ratio of cyclic yield stress to static yield stress is used to represent cyclic strengthening capacity, and the influence of the phase difference and loading condition on the non-proportional reinforcement effect is considered. It is also proposed that different materials have different influences on the additional hardening phenomenon. Meanwhile, the model revision results in stress under asymmetrical loading. Experimental data of GH4169 alloy show that the proposed model can provide better prediction than the Smith–Watson–Topper (SWT) and Fatemi–Socie (FS) models. View Full-Text
Keywords: GH4169 alloy; critical plane method; multiaxial fatigue; additional hardening; mean stress GH4169 alloy; critical plane method; multiaxial fatigue; additional hardening; mean stress
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Liu, J.; Zhang, Z.; Li, B.; Lang, S. Multiaxial Fatigue Life Prediction of GH4169 Alloy Based on the Critical Plane Method. Metals 2019, 9, 255.

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