Study on Thermal Stress-induced Brittle Fracture of Cast Iron

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Cast iron is used as material for motor and pump casings due to its superior casting characteristics. In addition, it is used for cylinder liners and pistons exposed to high temperatures because its strength does not deteriorate even at high temperature conditions. For parts made of cast iron, examples of brittle fracture damage induced by thermal stress are reported. However, there are a few failure examples where cracks lead to fracture. Therefore, a study was conducted to clarify the transition process of stationary crack to brittle dynamic fracture induced by thermal stress. All processes of fracture phenomena were recorded by an ultra-highspeed video camera. The position of the crack tip was determined from image data, and the propagation velocity of the crack was surmised. Then, the authors measured the surface roughness of the fracture process zone caused by crack propagation. Furthermore, the stress intensity factor which is a condition for a crack to propagate was obtained by calculation using the load data value of the specimen.

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