An Extended Model for Fatigue Life Prediction and Acceleration Considering Load Frequency Effect | Zendy

Yikun Cai | Zendy; Yu Zhao | Zendy; Xiaobing Ma | Zendy; Zhenyu Yang | Zendy; Ying Ding | Zendy

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An Extended Model for Fatigue Life Prediction and Acceleration Considering Load Frequency Effect

Author(s) -

Yikun Cai,

Yu Zhao,

Xiaobing Ma,

Zhenyu Yang,

Ying Ding

Publication year - 2018

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2018.2820689

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

With consideration of the load frequency effect of constant-amplitude fatigue test, a fatigue acceleration technique is developed in this paper. Load frequency shows effects on both macroscopic mechanical properties and microscopic deformation behaviors of material. Thus it is necessary to take the load frequency effects into consideration in the fatigue life prediction models. In this paper, an extended model based on the S-N approach is proposed to consider the frequency effect. Fatigue life is predicted with a heteroscedastic method, and then the acceleration by increasing load frequency and stress amplitude is studied. The presented model is also validated by a comparison between the theoretical prediction and experimental results. It is shown that the presented model is consequential in improving the S-N curves obtained under various load frequencies. In addition, load frequency increasing can lead to effective acceleration although the retardant effect is also triggered due to the increase of deformation resistance.

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