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Mathematical Problems in Engineering
Volume 2014, Article ID 583803, 9 pages
Research Article

Reliability Modeling and Assessment of Component with Multiple Weak Sites under Complex Loading

1School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
2Department of Mechanical Engineering, Shenyang Institute of Engineering, Shenyang 110136, China

Received 21 June 2014; Revised 10 November 2014; Accepted 10 November 2014; Published 18 November 2014

Academic Editor: Leonid Shaikhet

Copyright © 2014 Wenxue Qian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A component with multiple weak sites is widely used in practical engineering and the existence of multiple weak sites can significantly decrease the component reliability. On the other hand, only a few components bear static loading and most components bear dynamic loading. In this paper, a reliability model of isomorphic component with multiple weak sites is built based on an order statistics model and the influences of strength decentrality and loading decentrality on isomorphic component with multiple weak sites are discussed. Furthermore the influence of loading times is studied in detail. The results show that unlike a component with only one weak site, not only does the failure of a component with multiple weak sites have a relationship with the safety margin, but there also exist relationships with the number of weak sites, the loading roughness, and loading times. The work in this paper is of some guiding significance in reliability design and assessment of a component with multiple weak sites under complex loading.