By integrating destructive testing with the structural hot spot method, this study establishes a reliable fatigue life estimation framework for S960QL UHSS mobile cranes; successfully predicting a minimum fatigue life of 13,665 cycles and eliminating production uncertainties in high-stress welded joints.
In this study, static and dynamic finite element analysis (FEA) of a mobile crane design model were per-formed and stresses of welded joints were examined by the structural hot spot method. Especially in the welding of ultra-high strength steel (UHSS), choice of welding parameters affects mechanical properties. According to the FEA results, specimens containing different materials and welding parameters were prepared for investigated regions and an evaluation approach was proposed by performing destructive tests applied in this study. In this way, uncertainties in the production of welded joints are avoided by using destructive test results and FEA evaluations. As a result of the analysis, the hotspot value for maximum principal stress in critical regions of welded joints was found to be 527.54 MPa, and S960QL material was selected. As a result of these studies, UHSS materials were preferred and the minimum fatigue life estimate for welded joints was calculated as 13665 cycles and a mobile crane was produced.
Özden, O. B., Gökçe, B., Erdemir, A. (2025). Fatigue Life Estimation of Welded Joints in Mobile Cranes with Ultra High Strength Steels Using the Structural Stress Method. Journal of Materials and Mechatronics:A (JournalMM), 6(1), 226-240.
@article{ozden2025_3,
author = {Özden, O. B., Gökçe, B., Erdemir, A.},
title = {Fatigue Life Estimation of Welded Joints in Mobile Cranes with Ultra High Strength Steels Using the Structural Stress Method},
journal = {Journal of Materials and Mechatronics:A (JournalMM)},
volume = {6},
number = {1},
pages = {226-240},
doi = {10.55546/jmm.1669215},
year = {2025}
}
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