Fatigue Life Prediction Under Multiaxial Variable Amplitude Loading Using A Stress-Based Criterion

Quoc Huy Vu, Dinh Quy Vu and Thi Tuyet Nhung Le
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Quoc Huy Vu: Vietnamese-German University, Binh Duong, Viet Nam
Dinh Quy Vu: Hanoi University of Science and Technology, School of Transportation Engineering, Hanoi, Viet Nam
Thi Tuyet Nhung Le: Hanoi University of Science and Technology, School of Transportation Engineering, Hanoi, Viet Nam

International Journal of Manufacturing, Materials, and Mechanical Engineering (IJMMME), 2020, vol. 10, issue 1, 33-53

Abstract: This article presents fatigue life calculations for metals under different multiaxial variable amplitude loading patterns. Developed from a stress-based multiaxial fatigue criterion, a damage parameter used in the fatigue life prediction method can capture correctly different damage mechanisms (proportional and non-proportional multiaxiality, mean stress, asynchronous and variable amplitude) of fatigue loading in the high cycle fatigue domain. The method is based on a reference S-N curve and a cumulative damage law. Assessment of the accuracy of the proposed method is carried out with three different materials from literature (EN-GS800-2 cast iron, 39NiCrMo3 steel and SAE 1045 steel) subjected to different patterns of variable amplitude loading (blocks, non-proportional asynchronous and proportional random loading). Results reveal that the prediction method is in good accordance with the experimental data.

Date: 2020
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