A deteriorating model for the prediction of elastic modulus of the aging fiber reinforced polymer under complex environmental effects
A deteriorating model for the prediction of elastic modulus of the aging fiber reinforced polymer under complex environmental effects
复制标题
复杂环境影响下老化纤维增强聚合物弹性模量预测的恶化模型
DOI：
10.1177/1461348418811022
复制
发表时间：
2020
影响因子：
2.3
通讯作者：
Xu Yuye
中科院分区：
文献类型：
--
作者：
Luo Yi;Xia Senwei;Peng Xinqian;Xu Yuye
纤维增强聚合物广泛地应用于结构增强，然而，通常遭受长期环境影响，例如暴露于紫外线辐射、热-热的交替变化以及长期浸没在水中。因此，材料老化和结构性能退化是不可避免的，最终可能导致纤维增强复合材料力学性能的劣化，从而导致修复结构的衰减或失效。用实验方法来研究纤维增强复合材料的老化规律是非常昂贵和费时的。对于不同体积分数的纤维增强聚合物，可以通过能量原理推导出弹性模量的上下限。将该理论与试验相结合，可以用半经验的劣化方法分析纤维增强聚合物的力学性能变化。介绍了一系列由自然老化试验确定的经验系数。将这些系数应用于修正后的纤维增强复合材料力学性能预测公式中。劣化纤维增强聚合物的弹性模量受纤维、树脂基体和纤维体积分数的影响。对于不同的纤维体积分数，只要已知纤维老化规律、树脂老化规律和纤维体积分数，实验测试并不是评估纤维增强聚合物耐久性的唯一方法。该模型与试验结果吻合较好，可用于预测纤维增强复合材料的老化弹性模量，为工程设计和研究提供参考。
The fiber reinforced polymer is popularly applied for structural reinforcement and, however, usually suffers from long-term environmental effects, for example exposed to the ultraviolet radiation, alternating changes of moist-heat, and submerged in water chronically. As a result, the material aging and structural performance degradation are inevitable, which could eventually lead to the deterioration of mechanical behavior of fiber reinforced polymer, hence the attenuation or failure of repaired structures. It is very expensive and time consuming to use the experimental method to find out the aging patterns of fiber reinforced polymer. For fiber reinforced polymer with different volume fraction, the upper and lower limit of elastic modulus can be deduced by the energy principle. Combining this theory with tests, a semi-empirical deteriorating method can be used to analyze the change of fiber reinforced polymer mechanics behavior. And a series of empirical coefficients, determined by natural aging tests, are introduced. The coefficients are applied in the revised formula for the prediction of mechanics behaviors of fiber reinforced polymer. The elastic modulus of deteriorating fiber reinforced polymer is influenced by the fiber, the resin matrix, and the volume fraction of the fiber. For different fiber volume fraction, the experimental test is not the unique way to assess the durability of fiber reinforced polymer, as long as the laws of fiber aging, the laws of resin aging, and the fiber volume fraction are already known. The proposed model shows good agreement with the test results, hence can be used to predict the elastic modulus of aging fiber reinforced polymer, which can be utilized as references for engineering design and research in the future.