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http://dx.doi.org/10.3795/KSME-A.2015.39.3.319

Study on Fatigue Characteristics of High-Strength Steel Welds  

Chang, Hong Suk (Automotive Research & Development Division, HYUNDAI MOTOR GROUP)
Yoo, Seung Won (Automotive Research & Development Division, HYUNDAI MOTOR GROUP)
Park, Jong Chan (Automotive Research & Development Division, HYUNDAI MOTOR GROUP)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.39, no.3, 2015 , pp. 319-325 More about this Journal
Abstract
High-strength steel has replaced mild steel as the material of choice for truck decks or frames, owing to the growing demand for lightweight vehicles. Although studies on the weld fatigue characteristics of mild steel are available, studies on high-strength steels have been seldom conducted. In this study, firstly, we surveyed a chosen number of approaches and selected the Radaj method, which uses the notch factor approach, as the one suitable for evaluating the fatigue life of commercial vehicles. Secondly, we obtained the S-N curves of HARDOX and ATOS60 steel welds, and the F-N curves of the T-weld and overlapped-weld structures. Thirdly, we acquired a general S-N curve of welded structures made of high-strength steel from the F-N curve, using the notch factor approach. Fourthly, we extracted the weld fatigue characteristics of high-strength steel and incorporated the results in the database of a commercial fatigue program. Finally, we compared the results of the fatigue test and the CAE prediction of the example case, which demonstrated sufficiently good agreement.
Keywords
Weld; High-Strength Steel; Fatigue; S-N Curve; Weld Notch; ATOS; HARDOX; Overlapped Joint; T-Joint;
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