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Impact fatigue of a polycarbonate/acrylonitrile‐butadiene‐styrene blend
Author(s) -
Ho MingHsiung,
Hwang JiunRen,
Doong JiLiang,
Fung ChinPing
Publication year - 1999
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11459
Subject(s) - materials science , polycarbonate , izod impact strength test , composite material , acrylonitrile butadiene styrene , impact energy , tearing , molding (decorative) , fracture (geology) , viscoplasticity , fracture mechanics , scanning electron microscope , ultimate tensile strength , constitutive equation , structural engineering , finite element method , engineering
This study analyzes the impact properties of a polycarbonate/acrylanitrile‐butadiene‐styrene (PC/ABS) blend. The specimens were prepared under various injection molding conditions, including filling time, melting temperature, and mold temperature. Impact tests were performed with a Dynatup drop weight impact tester at different impact energies (10, 15, 20, 25 J). The fracture mechanism was examined with a scanning electron microscopy. The results indicated that the load‐time history of the PC/ABS blend has approximately a sinusoidal form in impact. The best injection molding conditions are a filling time of 12 s, a melting temperature of 260°C and a mold temperature of 80°C. In this case, the specimen shows the highest energy absorbed in single impact, together with the highest impact number in impact fatigue. The impact number and the accumulation energy seem to follow an exponential curve as the impact energy decreases. The PC/ABS blend material clearly exhibited ductile fracture with a continuous reduction in strength by viscoplastic deformation. The higher the impact number, the higher the accumulation energy. The accumulation energy of impact fatigue with impact energy 10 J is about 35–45 times greater than the energy absorbed in single impact. Tearing, shear fracture, and plastic deformation are the major fracture mechanisms of the PC/ABS blend matrix in single impact and repeated impact conditions.