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The Combined Effects of Environmental Conditioning and Sustained Load on Mechanical Properties of Wet Lay-Up Fiber Reinforced Polymer

机译：环境调节和持续载荷对湿法铺网纤维增强聚合物力学性能的综合影响

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The aim of this study was to investigate the combined effects of an aggressive environment and sustained load on the mechanical properties of wet lay-up fiber reinforced polymers (FRP). A total of 390 specimens, including 234 carbon fiber reinforced polymer (CFRP) specimens and 156 glass fiber reinforced polymer (GFRP) specimens, were exposed to freeze–thaw cycles, hygrothermal aging, and wet–dry cycles either in an unstressed state or loaded to about 30% or 60% of the initial ultimate load. Uniaxial tension tests were conducted on the samples after specific exposure time as well as on the control samples; and tensile properties were measured for each specimen. The results showed that the three environmental exposures, particularly hygrothermal aging, led to a significant decrease in tensile strength and elongation of the CFRP and GFRP specimens even for relatively short conditioning periods, and this decrease was markedly exacerbated by higher external loading levels. It was interesting to observe that the tensile modulus of the CFRP and GFRP specimens exhibited an excellent resistance and even appeared to increase slightly after exposure. Finally, predictive values of tensile strength based on the Arrhenius method were compared with the design values of ACI 440.2R-08 and GB 50608-2010. The results showed that both ACI 440.2R-08 and GB 50608-2010 were too conservative and significantly underestimated the tensile strength of FRP materials after an anticipated exposure period.
机译：这项研究的目的是研究侵略性环境和持续载荷对湿式铺网纤维增强聚合物（FRP）的机械性能的综合影响。总共390个样本（包括234个碳纤维增强聚合物（CFRP）样本和156个玻璃纤维增​​强聚合物（GFRP）样本）在无应力状态或加载状态下经受了冻融循环，湿热老化和干湿循环达到初始极限载荷的30％或60％。在特定的暴露时间后，对样品以及对照样品进行单轴拉伸试验;测量每个样品的拉伸性能。结果表明，即使在相对较短的条件下，三种环境暴露（尤其是湿热老化）也导致CFRP和GFRP试样的抗张强度和伸长率显着降低，并且较高的外部载荷水平明显加剧了这种降低。有趣的是，CFRP和GFRP试样的拉伸模量显示出极好的抗性，甚至在暴露后似乎略有增加。最后，将基于Arrhenius方法的抗张强度预测值与ACI 440.2R-08和GB 50608-2010的设计值进行了比较。结果表明，ACI 440.2R-08和GB 50608-2010都过于保守，并大大低估了预期的暴露时间后FRP材料的拉伸强度。

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