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Prediction Method of Low-cycle Fatigue Breakdown in HSDI Diesel Cylinder Head

Article of Honda R&D Technical Review Vol.22 No.2


This paper introduces a method of predicting low-cycle fatigue breakdown that takes as its focus the area around the glow plug hole of the diesel engine cylinder head, where cracks frequently occur during operating modes in which hot and cold cycles are repeated. Because an understanding of the strain amplitude and temperature of the areas in which cracks originate is necessary in predicting fatigue breakdown, strain analyses were conducted using CAE, and at the same time a method of calculating temperature from hardness measurements was used to determine local temperatures. This made it possible to study the local conditions of the cylinder head combustion chamber, which had previously represented a challenge. In addition, a hot-and-cold cycle endurance test using a prototype engine demonstrated the validity of predictions of low-cycle fatigue breakdown using the new method. The project also proposes the incorporation of the method in the design process in order to employ it as a tool for the review of specifications in new engine development.


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Author (organization or company)

Shohei MIKAMI(Automobile R&D Center)、Koichi OGINO(Automobile R&D Center)、Mitsumasa SORAZAWA(Automobile R&D Center)

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