Affiliation:
1. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, China
2. School of Mechanical and Mining Engineering, the University of Queensland, Saint Lucia, QLD, Australia
Abstract
The most usual failure mode of any mechanical structure is fatigue, which is characterized by an important feature of the decrease of elastic modulus of the material. In this paper, a fatigue life evaluation model based on equivalent elastic modulus is proposed for in-service mechanical structure. In the proposed model, parameters that represent the operating conditions of the mechanical structure, such as load, vibration, and shaft torque, etc., are used as the generalized load. To replace the fatigue stress, the statistical method is used here, which is also used in the conventional fatigue analysis method. The structural strain is also measured simultaneously. Using the statistical theory, the equivalent modulus of elasticity is formulated based on the relationship of stress, strain, and modulus of elasticity. To validate the proposed model, an online fatigue damage experiment has been conducted. The experimental results have been compared with that of the fatigue life prediction model with good agreement. It is expected that the methodology proposed in this paper will be widely used.
Funder
national key research and development program of china
Key Science and Research Program in University of Henan Province
Science and Technology Major Program of Henan Province of China
the authors also acknowledge funding from Key Technology of High Speed Supercritical CO2 Tur-bine Henan Centre for Outstanding Overseas Scientists
Cited by
4 articles.
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