Cumulative Damage-Based Stiffness Reliability Analysis of the Stochastic Structural System
Based on the understanding of passive impact of crack induced by fatigue load on ultimate stress and the relation of material strength and elastic modulus, the paper gives expression of residual elastic modulus with the form of cumulative damage and analyzes its digital character. The reliability index is calculated by using advanced first order second moment reliability method and the stochastic finite element method because the structures are stochastic, the significant failure modes are identified by using the advanced branch and bound method, and the reliability of structural system is evaluated by PNET method. A numerical example is indicated that the fatigue reliability index of structural system can fulfils the demand of fatigue reliability in the design life, but the stiffness reliability index of structural system descends with the increase of the service life, and the stiffness reliability index can not fulfils the demand of the design when life over one third of the whole service life, it shows that the cumulative damage influence to structural stiffness reliability analysis can’t be ignored.
M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz
X. C. Yan, W. T. Zhao, "Cumulative Damage-Based Stiffness Reliability Analysis of the Stochastic Structural System", Key Engineering Materials, Vols. 324-325, pp. 219-222, 2006