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Research Papers

The Reliability of a Component Under Several Distributed Cyclic Numbers at the Corresponding Constant Cyclic Stress Levels

[+] Author and Article Information
Xiaobin Le

Department of Mechanical
Engineering and Technology,
Wentworth Institute of Technology,
550 Huntington Avenue,
Boston, MA 02115
e-mail: Lex@wit.edu

Manuscript received February 11, 2017; final manuscript received September 19, 2017; published online October 5, 2017. Assoc. Editor: Alba Sofi.

ASME J. Risk Uncertainty Part B 4(2), 021009 (Oct 05, 2017) (8 pages) Paper No: RISK-17-1016; doi: 10.1115/1.4037970 History: Received February 11, 2017; Revised September 19, 2017

The probabilistic stress-number of cycles curve (P-S-N curve) approach is widely accepted for describing the fatigue strengths of materials. It is also a widely accepted fatigue theory for determining the reliability of a component under fatigue loadings. However, it is an unsolved issue in the P-S-N curve approach that the calculation of reliability of a component under several distributed cyclic numbers at the corresponding constant cyclic stress levels. Based on the commonly accepted concept of the equivalent fatigue damage, this paper proposes a new method to determine the reliability of the component under several distributed cyclic numbers at the corresponding constant cyclic stress levels. Four examples including two validation examples will be provided to demonstrate how to implement the proposed method for reliability calculation under such fatigue cyclic loading spectrum. The relative errors in validation examples are very small. So, the proposed method can be used to evaluate the reliability of a component under several distributed cyclic number at different stress levels.

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