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The objective of this study is to investigate thermal durability of grey cast iron GJL250 material flywheel based on casting graphite flake size under abusive and unusual driving condition which causes forced slippage. In daily routine, drivers may make half press of clutch pedal and switch the gear out of sequence during long traffic condition. This case leads to slippage between flywheel and clutch that causes energy dissipation in clutch house. During slippage, thermal load on flywheel increases and when it reaches critical level this may cause thermal cracks on flywheel. In this study, graphite flake size effects on thermal durability were investigated. In order to simulate daily abusive usage, flywheels which have different graphite flake type and size were subjected to forced slippage test at the test bench which simulates the abusive usage on the car. The findings of this study is different size of graphite flake types on flywheel directly effects the thermal performance of material and may cause prominent cracks during over dissipated energy occurrence. At the end of the forced slippage test, the cast iron which has higher graphite size completed the test without crack, whereas prominent cracks were observed on the casting which has smaller laminar graphite size.

Graphite Flake Size Effects to Thermal Durability of Automobile Flywheel Under Forced Slippage