ブレーキディスクの幾何学形状のき裂発生への影響　　き裂発生防止方法

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タイトル別名
  • Influence of Hole Layout on Crack Initiation from Small Holes for One-Piece Brake Discs. Improvement Method for Crack Initiation.
  • ブレーキディスク ノ キカガク ケイジョウ ノ キレツ ハッセイ エ ノ エイキョウ キレツ ハッセイ ボウシ ホウホウ

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For one-piece brake discs, tiny cracks exceptionally occur from holes at the flange due to cyclic thermal stress under an extraordinarily severe condition when discs have a certain number of holes and layout. In order to reveal the mechanism for crack initiation from holes in the flange of one-piece brake discs, braking tests under overloading conditions were conducted using five types of discs whose number of holes and their layout were different. Unsteady heat transfer analyses were also carried out to estimate the temperature distribution and its variation with respect to time by the finite element method. The experimental and calculated results showed that the maximum temperature and the difference between maximum and minimum temperatures increased when the number of holes decreased due to a decrease in heat mass of the flange. Consequently, the stress occurring around the holes slightly increases. However, the hole location has more significant effect on the crack initiation than the number of holes. If holes are located closer to the external edge of the disc, the thermally cyclic stress amplitude around the holes becomes higher as well as its magnitude.

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