The Influence of Stiffness Decay on Fatigue Reliability of Truss System

Abstract:

Physical properties of element are very complex under fatigue loads.The structural system consisted of elements is not a simple topological structure,which the change of its physical properties is more complex.In order to analyze quantitatively the structural stiffness reliability of different design life,it is important to establish the accurate formula of physical properties decrease. In this paper, the formula of elements’ elastic modulus decrease is deduced by using damage mechanics theory combining with the model of residual strength of element. Moreover, stiffness reliability index of controlling node of truss system is solved by applying the Stochastic Finite Element Method in different service life.

• Periodical: Key Engineering Materials (Volumes 385-387)
• Pages: 325-328
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.385-387.325
• Online since: July 2008
• Authors: Hai An, Wei Guang An, Yong Yi Zhang
• Keywords: Elastic Modulus Decrease, Fatigue Load, Residual Strength, Stiffness Reliability Index, Stochastic Finite Element Method

References

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DOI: 10.1177/002199839703100202

[3] An Wei-guang, Cai Yin-lin, Chen Wei-dong. Reliability analysis and optimum design for stochastic structure systems. Harbin: Harbin Engineering University Press(2005) 2. 0 m 2. 0 m 2. 0 m 5 6 1 2 3 4.

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[10] p x y Fig1. Truss system.