Impact fatigue of a polycarbonate/acrylonitrile‐butadiene‐styrene blend
Impact fatigue of a polycarbonate/acrylonitrile‐butadiene‐styrene blend
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聚碳酸酯/丙烯腈-丁二烯-苯乙烯共混物的冲击疲劳
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
C. Fung
中科院分区：
文献类型：
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作者：
M. Ho;J. Hwang;J. Doong;C. Fung
本研究分析了聚碳酸酯/丙烯腈-丁二烯-苯乙烯（PC/ABS）共混物的冲击性能。在各种注射成型条件下制备试样，包括填充时间、熔融温度和模具温度。用Dynatup落锤冲击试验机在不同冲击能量（10、15、20、25 J）下进行冲击试验。用扫描电子显微镜研究了断裂机制。结果表明，PC/ABS共混物的冲击载荷-时间历程近似为正弦曲线。最佳的注塑成型条件是填充时间为12 s，熔融温度为260 ℃，模具温度为80 ℃。在这种情况下，试样显示出在单次冲击中吸收的最高能量，以及在冲击疲劳中的最高冲击次数。冲击次数和累积能量随冲击能量的减小呈指数曲线变化。PC/ABS共混材料明显表现出韧性断裂，粘塑性变形导致强度持续降低。冲击次数越高，累积能量越高。冲击能为10 J的冲击疲劳累积能量约为单次冲击所吸收能量的35-45倍。在单次冲击和多次冲击条件下，PC/ABS共混物基体的断裂机制主要为撕裂、剪切断裂和塑性变形。
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.