光热水同步气候下的PC老化研究及其仿真应用

Research on PC Aging under the Climate Feature of Sunshine-heat-humid over the Same Period and Its Simulation Application

由于缺乏聚碳酸酯在温和气候下的老化数据,选择杭州作为试验地点,开展为期2年的户外暴露试验,研究其在光、热、水同步气候下的拉伸性能老化规律,并验证所测结果在仿真领域的适用性,为预测实际产品服役期限内的工作状态提供基础。由试验结果可知,聚碳酸酯的各项拉伸性能呈现不同演化趋势:屈服强度存在强化,2年后最高可达103%;断裂强度基本稳定,保持率在95.0%左右;断裂伸长率降低明显,白色样条保持率为74.0%。此外,黑白两色的聚碳酸酯样条因为采用不同的添加剂,拉伸性能存在明显差异。结合上述研究数据,分别构建未老化以及老化后的拉伸仿真模型。通过与试验对比可知,仿真预测的最大误差低于6.5%,证明研究结果在仿真领域的适用性。

Due to the lack of the aging data of polycarbonate in temperate climates,selecting Hangzhou as the test site to carry out a 2-year natural exposure test,which can be used to study the aging law of its tensile properties under the seasonal cooperation of sunshine-heat-humid.After that,the obtained results were proved to be suitable for simulation,which provided a basis for predicting the working state of the actual product during its service life.According to the results,the tensile properties showed diff erent trends.Yield stress had been enhanced slightly after two-year aging,up to103%.Fracture stress remained stable,and its retention rate was about 95.0%.However,elongation ratio at break was decreased markedly,the retention rate of white specimens was 74.0%.Besides,because of using different material additives,there was an obvious difference between the tensile properties of black and white specimens.Based on the experimental data,two tensile simulation models(before and after aging)had been established based on the experiment data.Compared the simulating result with experiment result,the maximum error was less than 6.5%,showing a good applicability of the research result.