玻璃纤维环氧层压板在零度以下承受拉伸载荷时的机械性能和损伤发展情况

A. Krzak, Z. Al-Maqdasi, G. Matula, A. J. Nowak, R. Joffe
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引用次数: 0

摘要

在各种结构应用中,聚合物复合材料会暴露在零度以下甚至低温环境中,这可能会导致微观结构损坏。为了预测这些事件,我们需要了解复合材料在零度以下环境中的行为。本研究的重点是零下温度下损伤的引发和累积,以及其对交叉层玻璃纤维环氧树脂复合材料性能的影响。此外,还研究了环氧树脂的溴改性以及在有机溶剂中的溶解对所生产的复合材料机械性能的影响。为了评估零度以下环境对玻璃纤维环氧树脂层压板机械性能的影响,在零度以下环境中对未调节的试样进行了拉伸试验。准静态拉伸试验用于测量复合材料的弹性模量,而加载-卸载试验则用于监测微结构损伤的发生(和累积)及其对玻璃纤维环氧层压板刚度的影响。本文讨论了层压板的低温损伤和断裂结果,重点关注玻璃纤维在结构应用中的关键性能退化:强度和刚度。
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Mechanical properties and damage development in glass-fiber epoxy laminates subjected to tensile loading at sub-zero temperatures
In various structural applications polymer composites are exposed to sub-zero and even cryogenic temperatures which may initiate of microstructural damage. To anticipate these events, one needs to understand the behavior of composites in a sub-zero environment. This study focuses on damage initiation and accumulation, and its influence on the properties of cross-ply glass fibers epoxy composites at sub-zero temperatures. The effect of bromine modification of epoxy, and the dissolution in an organic solvent on the mechanical performance of the produced composite is also investigated. To evaluate the influence of a sub-zero environment on the mechanical performance of glass fiber epoxy laminates, tensile tests in a sub-zero environment of unconditioned specimens were carried out. The quasi-static tensile tests were performed to measure the elastic modulus of the composites while loading-unloading experiments were performed to monitor the initiation (and accumulation) of microstructural damage and its influence on the stiffness of glass fiber epoxy laminates. The results of cryogenic damage and fracture in the laminates are discussed with a focus on the degradation of properties of glass fiber crucial for their use in structural applications: strength and stiffness.
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