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Improved extrapolation method for the fatigue damage of bus structural steel under service loading
Rando Tungga Dewa,Miloslav Kepka 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
This paper shows a technical study and analysis of the fatigue damage assessment of bus structural steel under service loading. Two bus prototypes (passenger-loaded and empty) are used in the experimental measurement for a typical city road. A deterministic analysis is performed for fatigue damage assessment and the remaining strength. These parameters are used for the construction of fatigue design curves, which can predict the designed fatigue life to failure. Results show a promising prediction that can be used for best practice in future design. To complete the investigation, this work also examined the different perspectives of system failure on the basis of the probability of fatigue life in the form of a distribution function. All results are satisfactory from the analysis perspective. However, design improvement should be addressed to achieve the target life.
Low Cycle Fatigue Properties of GTAWed Alloy 617 at Room Temperature and 800℃
Rando Tungga Dewa,Seon-Jin Kim(김선진),Sang-Yoel Lee(이상열),Woo-Gon Kim(김우곤),Min Hwan Kim(김민환) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The low cycle fatigue (LCF) properties of Alloy 617 weld joints (WJ) were investigated in the expected operating conditions. The fully reversed LCF tests in a constant strain ratio (R=-1) were carried out in four different total strain controlled and were compared for Alloy 617/Alloy 617 weld joints (WJ) by a gas tungsten arc welding (GTAW) process in air at room temperature and 800oC. The cyclic stress-strain relationship was identified. The fatigue life was decreased when temperature increasing. The fracture behavior was examined in microstructure observations for Alloy 617/Alloy 617 WJ at both temperature conditions. In addition, this material exhibited a transgranular fracture for both temperature conditions cut along the grain boundary (GB).