Measuring of Core Split Line Defect on Pillar Type Vented Brake Disc and Investigation of Crack Occurrence Potential on the Disc Caused by Its Geometric Deviation

Abstract

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In this study, firstly, a measuring method was defined to convert the defects level to numeric data which defects were formed as missing material on the pillar type vented brake disc. Then, the geometric defects which are coming from the core on the droplets were examined with the defined method in only pillar type vented brake disc. In the last, some special performance tests were performed with these discs which are included these defects according to related standards to evaluate how risky these discs during usage in the vehicle in terms of safety.

The main open point, is the defect can transform to a crack by influencing with notch effect during the worst usage conditions? In the conducted tests; it was investigated that the worst core split line defects which specified by the defined measuring flow can be caused a crack formation by proceeding notch effect under the worst usage condition. For simulating the worst usage condition, test laboratories, equipment and test track were used in these periods for performing crack test on bench, crack test with thermal shock and crack test on vehicle.

Keywords

• Brake disc,core,crack analysis,casting defect

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