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http://dx.doi.org/10.6108/KSPE.2022.26.5.001

Comparison and Evaluation of Low-Cycle Fatigue Life Prediction Methods Using Cu-Cr Alloy Developed for Rocket Engines  

Jongchan Park (Launch Vehicle System Integration Team, Korea Aerospace Research Institute)
Jae-Hoon Kim (School of Mechanical Engineering, Chungnam National University)
Keum-Oh Lee (Small Launcher R&D Program Office, Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.26, no.5, 2022 , pp. 1-10 More about this Journal
Abstract
For Cu-Cr alloy developed for rocket engines, estimated fatigue lives were calculated using various fatigue life prediction methods and compared with fatigue life acquired from low-cycle fatigue tests. The utilized methods for fatigue life prediction are as follows: Coffin-Manson relation, plastic/total strain energy density relations, Smith-Watson-Topper relation, Tomkins relation, and Jahed-Varvani relation. As results of estimation of fatigue lives, it satisfied within scatter band two compared to the test fatigue lives in all methods. The quantitative calculation of the deviation of predicted fatigue lives gives that the total strain energy density relation presents the best result.
Keywords
Cu-Cr Alloy; Low-Cycle Fatigue; Life Prediction;
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