A Multiaxial Variable Amplitude Fatigue Life Prediction Method Based on a Plane Per Plane Damage Assessment
American Journal of Mechanical and Industrial Engineering
Volume 3, Issue 4, July 2018, Pages: 47-54
Received: Jun. 23, 2018;
Accepted: Jul. 19, 2018;
Published: Aug. 17, 2018
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Bianzeube Tikri, Department of Mechanical Engineering, Polytechnic University of Mongo, Mongo, Chad
Fabienne Fennec, Department of Mechanical Engineering, Clermont Auvergne University, Clermont-Ferrand, France
Bastien Weber, Department of Metallurgical and Materials Engineering, ARCELORMITTAL Maizieres Research, Maizieres-Les-Metz, France
Jean-Louis Robert, Department of Mechanical Engineering, Clermont Auvergne University, Clermont-Ferrand, France
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A multiaxial variable amplitude fatigue life prediction method is proposed in this paper. Three main steps are distinguished. The first one concerns the counting of multiaxial cycles and uses the normal stress to a physical plane as the counting parameter. Then a multiaxial finite fatigue life criterion allows one to assess the material life corresponding to each cycle on any physical plane. A damage law and its cumulation rule describe the damage induced by each cycle plane per plane. By this way the critical plane for a given multiaxial stress history is found out. It is assumed to be the fracture plane and the fatigue life of the material is traduced as the number of repetitions of the sequence up to crack initiation. At this stage, material fatigue criteria and linear and nonlinear damage laws assume that the material is damaged. One distinguishes among these criteria critical plan type whose formalism can identify the crack initiation plan. An application is given for each load. In the context of multiaxial solicitations of variable amplitude, a validation of the estimation of the orientations of the priming planes is carried out based on experimental results on cruciform test pieces; the estimated orientations are close to those observed experimentally.
Multiaxial Fatigue, Variable Amplitude, Fatigue Life, Damage Law, Cycle Counting
To cite this article
A Multiaxial Variable Amplitude Fatigue Life Prediction Method Based on a Plane Per Plane Damage Assessment, American Journal of Mechanical and Industrial Engineering.
Vol. 3, No. 4,
2018, pp. 47-54.
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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