The purpose of this study is to quantitatively characterize the compressive and damage behavior of a woven fiberglass composite under combined environmental loading. Cuboidal samples of a commercially available woven fiberglass epoxy resin composite, garolite G10, are examined under uniaxial compressive loading perpendicular to the plies at quasi-static (10−3 s−1) and dynamic (103 s−1) strain rates using a standard load frame and Kolsky (split-Hopkinson) bar. In order to simulate environmental conditions, a subset of samples were soaked in either distilled or ASTM standard seawater prior to loading. Two time periods of environmental conditioning were investigated: short term at two weeks and long term at four months. Results demonstrate that, on average, the dynamic compressive strength of the fiberglass increased 35% from the quasi-static. Moreover, environmentally treated samples generally experienced a decrease strain to failure, and composites exposed to water for only short periods exhibited signs of the absorbed water sustaining additional load under quasi-static rates. Ultra-high-speed photography combined with digital image correlation, a full-field surface kinematic measurement technique, is used to map 2D strains on the sample during loading. In all cases, a clear shear failure mechanism from local instabilities appears, and a Mohr–Coulomb failure criterion is used to extract a mesoscale cohesive shear stress and coefficient of internal friction.

中文翻译：

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复合压缩和环境载荷下编织玻璃纤维复合材料的破坏行为

本研究的目的是定量表征编织玻璃纤维复合材料在组合环境载荷下的压缩和损坏行为。使用标准在准静态 (10−3 s−1) 和动态 (103 s−1) 应变率下，在垂直于层的单轴压缩载荷下检查市售的编织玻璃纤维环氧树脂复合材料 garolite G10 的立方体样品载荷框架和 Kolsky (split-Hopkinson) 杆。为了模拟环境条件，在加载前将一部分样品浸泡在蒸馏水或 ASTM 标准海水中。研究了环境调节的两个时间段：两周的短期和四个月的长期。结果表明，平均而言，玻璃纤维的动态压缩强度比准静态增加了 35%。此外，经过环境处理的样品通常会经历减少的破坏应变，并且仅短时间暴露于水的复合材料表现出吸收水在准静态速率下承受额外负载的迹象。超高速摄影结合数字图像相关性，一种全场表面运动测量技术，用于在加载过程中绘制样品上的 2D 应变。在所有情况下，都会出现明显的局部不稳定性剪切破坏机制，并且使用 Mohr-Coulomb 破坏准则来提取中尺度内聚剪切应力和内摩擦系数。超高速摄影结合数字图像相关性，一种全场表面运动测量技术，用于在加载过程中绘制样品上的 2D 应变。在所有情况下，都会出现明显的局部不稳定性剪切破坏机制，并且使用 Mohr-Coulomb 破坏准则来提取中尺度内聚剪切应力和内摩擦系数。超高速摄影结合数字图像相关性，一种全场表面运动测量技术，用于在加载过程中绘制样品上的 2D 应变。在所有情况下，都会出现明显的局部不稳定性剪切破坏机制，并且使用 Mohr-Coulomb 破坏准则来提取中尺度内聚剪切应力和内摩擦系数。