Abstract
Braking tests under overloading were carried out using large one-piece brake disks having eyebrow-shaped holes as decoration. When the number of braking was greater than five, permanent deflection of the disks was observed. When the number of braking was less than six, no appreciable deflection occured. The experiment revealed that such deflection occurred during the cooling process after the final braking cycle. The mechanism for this phenomenon is explained based on the deflection-time record in conjunction with the temperature distribution of disks and its variation with respect to time. The key for this phenomenon is yielding in tension at the bridges between holes. The deflection occurs due to elastic-plastic buckling caused by shrinkage of the flange. Numerical simulations were successfully conducted by using a general 3 D FEM in consideration of geometrical and material non-linearities.
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