论文部分内容阅读
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。
By measuring the flexural properties and dynamic mechanical properties of glass fiber mat reinforced polypropylene composites after cooling and heating cycles in different temperature ranges and the interfacial shear strength of glass fiber reinforced polypropylene composites after cooling and heating cycles, Hot and cold cycle fatigue characteristics. The results show that the hot and cold cycles in a certain temperature range will damage the interface of PP fiber reinforced polypropylene and decrease the mechanical properties of the material. With the increase of temperature difference between cold and warm cycles and the decrease of cold junction temperature, The increase of the number of cycles leads to the more severe thermal damage on the interface of the material. Different composite systems have different ability to relax thermal stress under the same conditions of thermal and thermal cycling, so the interface is damaged to some extent .