コンパクト黒鉛鋳鉄CGIの疲労信頼性に及ぼす黒鉛形状フラクタル性の影響

概要

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Fatigue reliability of compacted graphite cast iron CGI produced by Sinter Cast method was investigated with attention to relationship between fatigue crack behavior and graphite profile. The main results obtained are as follows. (1) For the fatigue strength ratio, that is the fatigue strength per the tensile strength, CGI is superior to spheroidal graphite cast iron SGI. (2) The compacted graphite profile was very complicated like coastline with higher fractal dimension. (3) The graphite of CGI can be bonded with pearlite matrix. Because it was observed on the fracture surface of CGI that the fatigue crack propagated through the graphite cracking. This suggests that the compacted graphite bears loading. (4) The meso crack growth was considerably influenced by the compacted graphite due to its irregular profile. Non-propagating crack observed in fatigue limit was meso cracking process. (5) Higher fatigue strength ratio of CGI resulted from outstanding resistance against crack propagating due to irregular profile of compacted graphite of CGI.
一般社団法人日本機械学会の論文
1998-06-25