A comparison of methods for predicting the fatigue life of gray cast iron at elevated temperatures |
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| Authors: | Keum‐Oh Lee Soon‐Bok Lee |
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| Affiliation: | 1. Combustion Chamber Team of KSLV‐II R&D Program Executive Office, Korea Aerospace Research Institute, Daejeon, South Korea;2. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea |
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| Abstract: | High temperature fatigue life tests were compared with various life assessment methods for gray cast iron in the cylinder liners of marine engines. The plastic strain range‐based methods such as the universal slopes method, Mitchell's method, Bäumel and Seeger's method, and Ong's method were not predicted well. A method employing tensile energy density, which is defined as the sum of the tensile area of the plastic energy and the elastic energy in the hysteresis loop, was suggested as an improved alternative to the plastic strain range‐based methods. The life estimation equation using tensile energy density predicted well within the 3X scatter band at various temperature ranges of the gray cast iron. |
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| Keywords: | energy‐based model gray cast iron high temperature life prediction low‐cycle fatigue |
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