Open Access

ARTICLE

Numerical Simulation of Low Cycle Fatigue Behavior of Ti₂AlNb Alloy Subcomponents

Yanju Wang¹, Zhenyu Zhu², Aixue Sha¹, Wenfeng Hao^3,*

1 Materials Evaluation Center for Aeronautical and Aeroengine Application, AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, China
2 Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, 212013, China
3 College of Mechanical Engineering, Yangzhou University, Yangzhou, 225127, China

* Corresponding Author: Wenfeng Hao. Email:

(This article belongs to the Special Issue: Mechanical Reliability of Advanced Materials and Structures for Harsh Applications)

Computer Modeling in Engineering & Sciences 2023, 136(3), 2655-2676. https://doi.org/10.32604/cmes.2023.025749

Received 28 July 2022; Accepted 12 October 2022; Issue published 09 March 2023

Abstract

Many titanium alloy subcomponents are subjected to fatigue loading in aerospace engineering, resulting in fatigue failure. The fatigue behavior of Ti₂AlNb alloy subcomponents was investigated based on the Seeger fatigue life theory and the improved Lemaitre damage evolution theory. Firstly, the finite element models of the standard openhole specimen and Y-section subcomponents have been established by ABAQUS. The damage model parameters were determined by fatigue tests, and the reliability of fatigue life simulation results of the Ti₂AlNb alloy standard open-hole specimen was verified. Meanwhile, the fatigue life of Ti₂AlNb alloy Y-section subcomponents was predicted. Under the same initial conditions, the average error of fatigue life predicted by two different models was 20.6%. Finally, the effects of loading amplitude, temperature, and Y-interface angle on fatigue properties of Ti₂AlNb Y-section subcomponents were investigated. These results provide a new idea for evaluating the fatigue life of various Ti₂AlNb alloy subcomponents.

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