玻璃纤维毡增强聚丙烯复合材料的冷热循环疲劳特性

THERMAL-COLD FATIGUE OF GLASS MAT REINFORCED POLYPROPYLENE

通过测定玻璃纤维毡增强聚丙烯复合材料在不同温度区间内经冷热循环后的弯曲性能和动态力学性能以及玻璃纤维增强聚丙烯复合体系经冷热循环后界面剪切强度的变化 ,研究了该材料的冷热循环疲劳特性。结果表明 ,在一定温度区间内的冷热循环会对玻璃纤维毡增强聚丙烯的界面造成损伤 ,使材料的力学性能下降 ;随着冷热循环温度区间温差的增大、冷端温度的降低、循环次数的增多 ,形成的热应力对材料的界面损伤越严重 ;不同的复合体系由于其界面松弛热应力的能力不同 ,在同样条件下的冷热循环过程中 ,界面所受到的损伤程度有差异。

Thermal cold fatigue of glass mat reinforced polypropylene has been studied by measuring the flexural property and dynamic mechanical property of the composites and the interfacial shear strength of the single filament specimen after thermal cold cycling treatment in different ranges of temperature. The results show that thermal cold cycle leads to the interfacial failure and reduction in mechanical properties. The interfacial failure due to thermal stress will increase with increasing the range of temperature and the number of cycles. Under the same conditions, the interfacial failure of composites differs for different relaxation of the thermal stress of interfaces.