Effects of UV radiation, moisture and elevated temperature on mechanical properties of GFRP pultruded profiles
Effects of UV radiation, moisture and elevated temperature on mechanical properties of GFRP pultruded profiles
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DOI：
10.1016/j.conbuildmat.2019.117137
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发表时间：
2020-01-20
影响因子：
7.4
通讯作者：
Raman, R. K. Singh
中科院分区：
文献类型：
--
作者：
Bazli, Milad;Jafari, Armin;Raman, R. K. Singh
本研究探讨了紫外线辐射，水分和高温对玻璃钢拉挤型材的力学性能的影响。研究了不同玻璃纤维增强塑料（GFRP）截面在紫外光照射和水蒸汽冷凝循环下暴露1000、1500、2000和3000 h后的弯曲、压缩和拉伸性能。力学测试，包括三点弯曲，压缩和拉伸测试，扫描电镜分析，并进行统计研究，以收集全面的结果。结果表明，随着老化时间的延长，各种GFRP型材的力学性能普遍下降，但下降速度在1000 h之前很小，在1000-2000 h期间迅速上升，在2000-3000 h期间下降速度又很慢。在弯曲、拉伸和压缩试验中，暴露于3000 h循环后的最大减少量分别为34%、28%和23%。在弯曲试验中，层间剪切失效控制极限强度，降解比纤维断裂控制失效的情况更大。此外，关于横截面参数，得出的结论是，厚度和周长是有效的因素;样品越薄，周长越大，减少越大。然而，在所有截面中，横截面厚度和周长的最大影响不超过13%。(C)2019爱思唯尔有限公司版权所有。
The present research examines the effects of UV radiation, moisture and elevated temperature on the mechanical properties of GFRP pultruded profiles. Flexural, compressive and tensile properties of different GFRP sections were studied after they were exposed for 1000, 1500, 2000 and 3000 h to UV radiation and water vapour condensation cycles. Mechanical tests, including three-point bending, compression and tension tests, SEM analyses, and statistical studies were conducted to gather comprehensive results. The results showed that the mechanical properties of various GFRP sections generally decreased with the duration of conditioning: however, the rate of the decrease that was only slight up to 1000 h, increased rapidly during 1000-2000 h, and again it was slow during 2000-3000 h. The maximum reductions were 34%, 28% and 23% after exposure to 3000 h cycles for bending, tensile and compression tests, respectively. In the bending tests, where inter-laminar shear failure controls ultimate strength, the degradation was greater compared to the situation where fibres fracture controls the failure. Further, regarding the cross-section parameter, it was concluded that the thickness and perimeter are the effective factors; the thinner the sample and the larger the perimeter, the greater is the reduction. However, the maximum effect of the cross section in terms of thickness and perimeter did not exceed 13% among all sections. (C) 2019 Elsevier Ltd. All rights reserved.