G0300-6-2 片状黒鉛の分布を考慮した鋳鉄製シリンダブロックの強度評価に関する有限要素解析([G0300-6]材料力学部門一般講演(6):強度解析)

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  • G0300-6-2 Finite Element Analysis for Strength Evaluation of Cylinder Block of Gray Cast Iron Taking into Consideration the Distribution of Flaky Graphite

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The stress distribution in gray cast iron used for diesel engine cylinder block was calculated by the finite element method. The distribution of flaky graphite on the surface of the gray cast iron was observed by microscope and it was reproduced in the analysis model. Three models, (I) multiple graphite model, (II) multiple hole model, and (III) single hole model, were used and the stress distribution near the tip of flaky graphite was discussed. The stress intensity factor for critical flaky graphite was approximately calculated. The results of the present analysis suggested that the stress intensity factor for the critical flaky graphite was found to be about 3.7 times as high as that of a single crack with the same length. Furthermore, critical graphite length to the fracture of cylinder block of diesel engine was calculated based on the proposed method. The length was much larger than that of actual graphite.

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