Fatigue Reliability Analysis for Structures with Known Loading Trend

Abstract

Variations, such as those in product operation environment and material properties, result in random fatigue life. Variations in material fatigue properties depend on stochastic stress responses due to their nonlinear relationships with other random variables such as stochastic loading and dimensions. In this work, an efficient fatigue reliability analysis method is developed to accommodate those uncertainties for structures under cyclic loads with known loading trend. To reduce the computational cost, the method incorporates the fatigue life analysis model and the saddlepoint approximation method with the fast integration method. The new method is applied to the fatigue reliability analysis of a cantilever beam and a door cam. The results show high accuracy and efficiency of the proposed method benchmarked with Monte Carlo Simulations.

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

Cyclic loads; Fatigue of materials; Reliability analysis; Stochastic systems; Stress analysis; Computational costs; Fatigue life analysis; Fatigue reliability; Integration method; Non-linear relationships; Product operations; Saddle-point approximation; Stress-dependent; Monte Carlo methods

International Standard Serial Number (ISSN)

1615-147X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Springer Verlag, All rights reserved.

Publication Date

01 Apr 2014

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