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.

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Journal of Marine Science and Application ›› 2014, Vol. 13 ›› Issue (1) : 23 -31. DOI: 10.1007/s11804-014-1228-z
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Fatigue reliability assessment of correlated welded web-frame joints

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Abstract

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.

Keywords

fatigue reliability / hotspot stress / S-N approach / finite element analysis / web-frame joints

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W. Huang,Y. Garbatov,C. Guedes Soares. Fatigue reliability assessment of correlated welded web-frame joints. Journal of Marine Science and Application, 2014, 13(1): 23-31 DOI:10.1007/s11804-014-1228-z

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