EFFECTS OF UV AGING ON FATIGUE PROPERTIES OF GLASS FIBER REINFORCED EPOXY RESIN COMPOSITES

Abstract

Abstract: In this paper, the effects of UV aging on fatigue properties of glass fiber reinforced epoxy resin composite materials were studied. The microstructure, chemical structure and dynamic mechanical behavior of the composite materials were analyzed by SEM, FTIR and DMA. The results show that UV irradiation causes photodegradation of epoxy resin, breaks the chemical bond or intermolecular force in the chain segment, weakens the bond between resin and fiber, and disbonds part of the interface. After 28 days of UV aging, the static tensile strength of the composites decreased by 18%. The tension-tension fatigue tests show that the effect of UV aging on low cycle fatigue of composites is greater than that of high cycle fatigue. The degradation rate and extent of the stiffness of the composite materials after UV aging are higher than those of unaged samples, indicating that it is the UV aging that caused the decrease of the fatigue properties of the composite materials.

Key words: UV aging, composite material, epoxy resin, fatigue, chemical structure

CLC Number:

TB332

FU Chen-yang, NI Ai-qing, WANG Ji-hui, SUN Liang-liang. EFFECTS OF UV AGING ON FATIGUE PROPERTIES OF GLASS FIBER REINFORCED EPOXY RESIN COMPOSITES[J]. Composites Science and Engineering, 2020, 0(7): 74-80.

References

[1]Tsai Y I, Bosze E J, Bariasteh E, et al. Influence of hygrothermal environment on thermal and mechanical properties of carbon fiber/fiberglass hybrid composites[J]. Composites Science and Technology, 2009, 69(3-4): 432-437.
[2]乔琨, 朱波, 高学平, 等. 紫外老化对碳纤维增强环氧树脂复合材料性能的影响[J]. 功能材料, 2012, 43(21): 2989-2992.
[3]Pillay S, Vaidya U K, Janowski G M. Effects of moisture and UV exposure on liquid molded carbon fabric reinforced nylon 6 composite laminates[J]. Composites Science and Technology, 2009, 69(6): 839-846.
[4]高禹, 刘佳琦, 王绍权, 等. 高温老化对T700/HT280双马来酰亚胺复合材料疲劳性能的影响[J]. 复合材料学报, 2017, 34(2): 240-246.
[5]李成良, 王继辉, 薛忠民, 等. 大型风机叶片材料的应用和发展[J]. 玻璃钢/复合材料, 2008(4): 49-52.
[6]孙博, 李岩. 复合材料湿热老化行为研究及其耐久性预测[J]. 玻璃钢/复合材料, 2013(4): 29-35.
[7]Rocha I, Raijmaekers S, Nijssen R P L, et al. Hygrothermal ageing behaviour of a glass/epoxy composite used in wind turbine blades[J]. Composite structures, 2017, 174: 110-122.
[8]刘建华, 赵亮, 李松梅, 等. 盐雾环境对玻璃纤维增强树脂基复合材料力学性能的影响[J]. 复合材料学报, 2007(3): 18-22.
[9]Kumar B G, Singh R P, Nakamura T. Degradation of carbon fiber-reinforced epoxy composites by ultraviolet radiation and condensation[J]. Journal of composite materials, 2002, 36(24): 2713-2733.
[10]Barbosa A P C, Fulco A P P, Guerra E S S, et al. Accelerated aging effects on carbon fiber/epoxy composites[J]. Composites Part B: Engineering, 2017, 110: 298-306.
[11]中国国家标准化管理委员会. 机械工业产品用塑料、涂料、橡胶材料人工气候老化试验方法荧光紫外灯: GB/T 14522—2008[S]. 北京: 中国标准化出版社, 2008.
[12]中国国家标准化管理委员会. 纤维增强塑料层合板拉-拉疲劳性能试验方法: GB/T 16779—2008[S]. 北京: 中国标准化出版社, 2008.
[13]张代军, 刘刚, 包建文, 等. T700碳纤维增强环氧树脂基复合材料自然老化性能与机制[J]. 复合材料学报, 2016, 33(7): 1390-1399.
[14]Awaja F, Nguyen M T, Zhang S, et al. The investigation of inner structural damage of UV and heat degraded polymer composites using X-ray micro CT[J]. Composites Part A Applied Science & Manufacturing, 2011, 42(4): 408-418.
[15]Awaja F, Pigram P J. Surface molecular characterisation of different epoxy resin composites subjected to UV accelerated degradation using XPS and ToF-SIMS[J]. Polymer Degradation & Stability, 2009, 94(4): 651-658.
[16]倪爱清, 张厉丰, 冀运东, 等. E玻璃纤维/乙烯基酯复合材料的氙灯老化性能研究[J]. 复合材料学报, 2013, 30(s1): 33-39.
[17]Bellenger V, Verdu J. Photooxidation of amine crosslinked epoxies I. The DGEBA-DDM system[J]. Journal of Applied Polymer Science, 1983, 28(8): 2599-2609.
[18]Ray B C. Temperature effect during humid aging on interfaces of glass and carbon fibers reinforced epoxy composites[J]. Journal of Colloid and Interface Science, 2006, 298(1): 111-117.
[19]Ma Y, Zhang Y, Sugahara T, et al. Off-axis tensile fatigue assessment based on residual strength for the unidirectional 45° carbon fiber-reinforced composite at room temperature[J]. Composites Part A: Applied Science and Manufacturing, 2016, 90: 711-723.
[20]张阿樱, 张东兴, 李地红, 等. 碳纤维/环氧树脂层压板疲劳性能研究进展[J]. 玻璃钢/复合材料, 2010(6): 70-74.