Abstract
This study was conducted to accurately and quickly verify the durability of mufflers by predicting the fatigue life and comparing it to test results, considering the weld-zone shapes. To accomplish this, a specimen that was exactly the same as that applied to a car in service was produced for carrying out a bending fatigue test, after which an M-N curve plot was drawn. The cross section of the weld zone where the fatigue crack initiated was analyzed and measured. Then, the weld-zone shapes were modeled to measure the cross section, as well as to conduct a static structure analysis. With the result, the stress concentration factor of the specimen was calculated and the fatigue life was predicted by using the fatigue notch factor for the toe. By comparing the predicted life and test results, the fatigue life prediction was validated, and the alteration of the bead angle was found to have a greater effect on the fatigue life than alteration of the toe radius in relation to the weld-zone shapes.
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Recommended by Associate Editor Jin Weon Kim
Yong-Jun Lee received his M.S. degree from Graduate School of Pusan National University, Korea. He is currently in the doctoral course of the Graduate School of Pusan National University, Korea. Mr. Lee’s research interests include fatigue durability and CAE analysis.
Sung-Su Kang is currently a Professor a Department of Mechanical Engineering at Pusan National University, Korea. His research interests include plastic working process, mechanical metallurgy, heat treatment and welding.
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Lee, YJ., Kim, JY., Kim, CK. et al. Muffler fatigue life prediction considering weld-zone shapes. J Mech Sci Technol 27, 2721–2727 (2013). https://doi.org/10.1007/s12206-013-0717-3
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DOI: https://doi.org/10.1007/s12206-013-0717-3