Abstract
We investigated fatigue life and rupture mechanism of acrylonitrile-butadiene-styrene terpolymer (ABS) and polyethylene terephthalate (PET). Striation was observed in fracture surfaces of ABS. Fracture surfaces of PET showed cup & corn type. Fatigue crack initiated in the interior of the specimen at high stress amplitude. It is due to the effect of tri-axial stress. Fatigue crack started from the surface of the specimen at low stress amplitude. There were difference in the details of fatigue crack behavior between polymer alloy (ABS) and single polymer (PET).
