海水浸泡和紫外辐照环境下玻璃纤维增强复合材料缠绕管长期性能试验研究

Experimental Research on Long-Term Performances of GFRP-Wound Pipes in Environments of Seawater Immersion and UV Radiation

玻璃纤维增强复合材料(GFRP)在海洋环境下缠绕管的长期性能变化规律是影响GFRP管设计应用的重要因素。通过对GFRP缠绕管在海水浸泡、干湿凝露循环以及紫外辐照环境中有无紫外防护涂层情况下的耐久性能进行研究,共完成了306个GFRP缠绕管试件的老化模拟试验,时间最长为90 d。老化完成后进行了环向拉伸测试,得到了不同类型工况环境对GFRP缠绕管性能的影响变化规律。结果表明:1)海水浸泡环境中,不同厚度GFRP缠绕管环向强度有不同程度的下降,但经过足够长老化时间后,不同厚度GFRP缠绕管环向强度保留率趋于一致;2)紫外辐照环境下,厚度较薄的GFRP缠绕管环向强度有明显下降;3)紫外防护涂料可以使GFRP缠绕管在紫外辐照环境下的性能退化速度减慢,对于厚度越薄的管保护作用越明显。

The long-term performance of GFRP-wound pipes is an important factor affecting the design and application of GFRP pipes in the marine environment.The durability of GFRP-wound pipes in the condition of seawater immersion,wet-dry condensation cycle and UV radiation with or without UV protective coating was researched.A total of 306 GFRP-wound pipes were experienced accelerated aging in the laboratory for 90 days.The spilt-disk test was conducted after laboratory aging treatment,the influence of different types of exposed environments on the performance of GFRP-wound pipe was obtained.The results showed that:1)in the seawater immersion environment,the circumferential tensile strength of GFRP-wound pipes with different thicknesses decreased to different degrees,but after a long time,the circumferential tensile strength retention ratios of GFRP-wound pipes with different thicknesses tended to be consistent;2)in the ultraviolet irradiation environment,the circumferential tensile strength of GFRP-wound pipes with thinner thickness decreased significantly;3)the UV protective coating could make the circumferential tensile strength degradation of GFRP-wound pipes in the ultraviolet irradiation environment slow down,and the protection effect of the thinner the tube was more obvious.