球状黒鉛鋳鉄の疲労破面解析と黒鉛の挙動

概要

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Analysis of the fracture surface using rotating bending fatigue tests was conducted on austempered ductile iron (ADI) and ferritic ductile iron (FDI) for comparison purposes. The difference in the configuration of crack propagation of ADI and FDI was clarified. Propagation of the surface crack progresses, while the crack initiated in graphite repeats cohesion. However, in ADI, the propagating crack expanding on the fracture surface is extended rather than controlled by graphite. On the other hand, in FDI, since the graphite is equivalent to a porous material, the Crack grows as in a complex surface and finally fractures. In relation to the fracture surface rate obtained from information on the fracture surface and cyclic life, ADI exhibited a characteristic of a double bend resembling the knee of an S-N curve, and the surface fracture growth rate in the neighborhood of the fatigue limit was about 88%.
一般社団法人日本機械学会の論文
1994-02-25