Tanks Jonathon, Naito Kimiyoshi, Ueda Hisai
Research Center for Structural Materials, National Institute for Materials Science, 1-2-1 Sengen, Ibaraki, Tsukuba 305-0047, Japan.
Department of Aerospace Engineering, Tohoku University, 6-6-1 Aramaki-aza-Aoba, Miyagi, Sendai 305-0047, Japan.
Polymers (Basel). 2021 Sep 16;13(18):3136. doi: 10.3390/polym13183136.
Fiber-reinforced polymer (FRP) composites are becoming more frequently adopted as so-called "corrosion-resistant" concrete reinforcement materials due to their excellent mechanical properties and formability. However, their long-term reliability must be thoroughly investigated in order to understand failure mechanisms and to develop service life models. This study is on the mechanical properties of a prototype basalt fiber-reinforced polypropylene (BFPP) rod under quasi-static and sustained loading. Static strength and modulus at elevated temperatures do not decrease significantly, but the variability in strength increases with temperature, as shown by a Weibull analysis. Creep behavior is typical of unidirectional FRP, where the creep rupture strength follows a power law. Fatigue at various stress ratios reveals the sensitivity of composite strength to the matrix damage, which increases at lower values of (i.e., higher stress amplitudes). These results are discussed in the context of service life and concrete structure design guidelines.
由于具有优异的机械性能和可成型性，纤维增强聚合物（FRP）复合材料作为所谓的“耐腐蚀”混凝土增强材料正越来越频繁地被采用。然而，必须对其长期可靠性进行深入研究，以便了解失效机制并开发使用寿命模型。本研究针对一种原型玄武岩纤维增强聚丙烯（BFPP）棒材在准静态和持续荷载作用下的力学性能展开。高温下的静态强度和模量没有显著降低，但强度的变异性随温度升高而增加，如威布尔分析所示。蠕变行为是单向FRP的典型特征，其中蠕变断裂强度遵循幂律。不同应力比下的疲劳试验揭示了复合材料强度对基体损伤的敏感性，在较低的应力比（即较高的应力幅值）下这种敏感性会增加。将结合使用寿命和混凝土结构设计指南对这些结果进行讨论。
