大型二輪用一体型ブレーキディスクの円孔からのき裂発生に関する研究 : き裂発生に対する制動トルクの直接的影響について

概要

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Cyclic braking tests at extreme conditions were carried out using large one-piece brake disks having some small holes in their flange. When the number of braking cycles was beyond 300, some tiny cracks occurring around holes were found. They grew in the radial direction of brake disks. In order to examine whether braking torque is a driving force for crack initiation or not, the time interval was altered 10 times longer than the previous braking decreased when the braking interval was extended. The crack length also decreased. An alternative test at the same braking torque condition was also conducted while the disk surface temperature was always kept lower than 40°C. In this case, no cracks were observed after 300 cycles of braking. This results indicates that the braking torque itself does have little direct effect on crack initiation.
2000-06-25