内衬聚偏氟乙烯热塑层的纤维缠绕复合材料管径向平压性能

Radial Compressive Properties of Fiber-Reinforced Thermoset Composites Pipe with Thermoplastic Polyvinylidene Fluoride Inner Liner

纤维缠绕角度、纤维缠绕层厚度及碳/玻纤维混杂比是影响内衬聚偏氟乙烯(PVDF)热塑层的纤维增强热固性复合材料缠绕管径向平压性能的重要因素,其性能直接决定复合材料缠绕管产品掩埋深度和抗碾压能力。将PVDF颗粒经挤出机制成PVDF管,然后以表面喷砂处理后的PVDF管为内衬芯管,采用湿法缠绕技术制备不同结构参数的复合材料缠绕管。利用管平行板外载平压性能测试方法,测试了3种结构参数对复合材料管径向平压性能的影响,并分析其破坏模式与失效机理。结果表明,随缠绕层厚度的增加,径向压缩强度和径向压缩模量逐渐增大;随着缠绕角度的增大,径向压缩强度和径向压缩模量先增大后减小;另外,随着碳/玻纤维混杂比的提高,复合材料缠绕管的压缩强度和压缩模量相应增加。

The radial pressure performance of fiber-reinforced thermosetting composites winding pipe from ling polyvinylidene fluoride （PVDF） thermoplastic layer was affected by the winding angle, the winding thickness of enhancement layer and the hybrid ratio of carbon and glass fiber, which decides the buried depth and anti-rolling performance of composites pipes. The PVDF inner liner pipes were made by single screw pipe extrusion machine, and then the sand blasting process was used to increase the roughness of composite surface; finally the wet winding was used to fabricate different structure of pipes.This paper aimed to study the effect of three different structure parameters of the fabrication tubes on the radial pressure performance of composite winding pipes, and the failure mode and mechanism were also analyzed, so the pressure performance testing method of pipe parallel-plate external applied load was introduced. These conclusions could be got： radial pressure strength and modulus are gradually becoming large with increasing of the winding thickness of pipe; whereas the radial compression strength and modulus first increase then decrease when it comes to a certain peak value; in addition, with advance of the ratio of carbon and glass fiber, the compression strength and modulus are enhanced steadily.