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Fatigue Strength Evaluation of Carbody and Bogie Frame for the Light Rail Transit System  

Lee, Eun-Chul (Graduated School of Mechanical Engineering, Kyonggi Univ.)
Lee, Joon-Seong (Dept. of Mechanical System Engineering, Kyonggi Univ.)
Choi, Yoon-Jong (Dept. of Mechanical System Engineering, Kyonggi Univ.)
Lee, Jung-Hwan (Hanwha Chemical R&D Center)
Suh, Myung-Won (School of Mechanical Engineering, Sungkyunkwan Univ.)
Lee, Ho-Yong (Korea Railroad Research Institute)
Lee, Yang-Chang (Dealim Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.25, no.10, 2008 , pp. 77-83 More about this Journal
Abstract
In terms of saving costs, energy and materials, the weight of cars has been gradually reduced by optimizing design of structure, which also gives us good performance. In compliance with this, it should satisfy the lifetime of cars for 25 years under the operation. The purpose of this study is to evaluate the strength of fatigue using date from strain gauges attached carbody and bogie frame. This dynamic stress can be evaluated using S-N curve based on stress amplitude. Modified S-N curve by CORTON-DOLAN is used for more conservative and substantial evaluation. In addition, !he loadings itself of carbody and bogie frame are considered by calculating the rate of the differences which are occurred between empty car and fuiiy occupied car with passengers. Rainflow cycle counting method is applied to arrange the stress data for the modified S-N curve to predict lifetime of the materials. Conclusively the cumulative damages are not only calculated by Miner's Rule, but the safety factors are also determined by Goodman diagram.
Keywords
Fatigue Strength; Light Rail Transit System; Modified S-N Curve; Rainflow Cycle Counting; Cumulative Damage;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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