Fatigue reliability assessment of correlated welded web-frame joints
W. Huang , Y. Garbatov , C. Guedes Soares
Journal of Marine Science and Application ›› 2014, Vol. 13 ›› Issue (1) : 23 -31.
Fatigue reliability assessment of correlated welded web-frame joints
The objective of this work is to analyze the fatigue reliability of complex welded structures composed of multiple web-frame joints, accounting for correlation effects. A three-dimensional finite element model using the 20-node solid elements is generated. A linear elastic finite element analysis was performed, hotspot stresses in a web-frame joint were analyzed and fatigue damage was quantified employing the S-N approach. The statistical descriptors of the fatigue life of a non-correlated web-frame joint containing several critical hotspots were estimated. The fatigue reliability of a web-frame joint wasmodeled as a series system of correlated components using the Ditlevsen bounds. The fatigue reliability of the entire welded structure with multiple web-frame joints, modeled as a parallel system of non-correlated web-frame joints was also calculated.
fatigue reliability / hotspot stress / S-N approach / finite element analysis / web-frame joints
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