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首页> 外文会议>Sixth International Conference on Damage and Fracture Mechanics: Computer Aided Assessment and Control 2000 Nontreal, Canada, >Effects of aging on fracture behavior of polycarbnate
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Effects of aging on fracture behavior of polycarbnate

机译：时效对聚碳酸酯断裂行为的影响

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Polycarbonate (PC) is one of the toughest, most versatile engineering thermoplastics. However, due to physical aging phenomenon, the polymer can break in a brittle manner at normal temperature with relatively low loading rates. The aim of this work is to study the effects of aging on the brittle-ductile transition temperature (T_b-d) and he yielding behavior of an unmodified PC. Fractures tests were performed over a range of aloading rates from 0.2mm/min to 2.5 m/s, using the single edge notched bending specimen (SENB). T_b-d. was determined from the observed fracture behavior as a function of loading rate and temperature. Their relationship is analysed by an activation energy approach, using te Arrhenius-type equation. The results show that ageing increases the temperature at brittle-ductile transition of the pollymer and this effect ismore important at high loading rates. The activation energy seems to change with temperature, suggesting that the time-temperature dependence of the brittle-ductile transition is not ocntrolled by a single molecular relaxation process. Plane strain compression tests were carrie out ovr a range of strain-rates from 0.001 to 0.5 s~-1, and a range of temperatures form -80 to 60 degC for samples energy activation energies of the primary and secondary molecular relaxation processes. and to analyse the correlation between strain rate and temperature. This model supplies and acceptable fit to the experiment data for analysing time-aging-temperature dependence of yielding.
机译：聚碳酸酯（PC）是最坚韧，用途最广泛的工程热塑性塑料之一。但是，由于物理老化现象，该聚合物在常温下以相对较低的加载速率会以脆性方式断裂。这项工作的目的是研究老化对未改性PC的脆性-韧性转变温度（T_b-d）和屈服行为的影响。使用单边凹口弯曲试样（SENB）在0.2mm / min至2.5 m / s的加载速率范围内进行了断裂测试。 T_b-d。根据观察到的断裂行为确定载荷的大小和温度的函数。使用te Arrhenius型方程，通过活化能方法分析了它们之间的关系。结果表明，老化增加了花粉在脆性-韧性转变时的温度，在高加载速率下，这种作用更为重要。活化能似乎随温度而变化，这表明脆性-延性转变的时间-温度依赖性不受单个分子弛豫过程的影响。平面应变压缩测试的应变速率范围为0.001至0.5 s〜-1，温度范围为-80至60℃，用于样品的一次和二次分子弛豫过程的能量活化能。并分析了应变率与温度之间的关系。该模型为分析产量与时效温度之间的关系提供了可接受的拟合数据。

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