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Effect of thermal cycles on mechanical response of pultruded glass fiber reinforced polymer profiles of different geometries

机译：热循环对不同几何形状的拉挤玻璃纤维增​​强聚合物轮廓力学响应的影响

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摘要

This study investigates the effect of Thermal cycles on the mechanical properties of GFRP pultruded profiles with different geometries. Bending specimens consisted of I-shaped and U-channel profiles that were tested in three-point bending along their both principal weak and strong axes, whereas box profiles and laminates were used in compression and tension tests, respectively. Each specimen was exposed to a range of thermal cycles, between - 20 degrees C and 20 degrees C. The failure modes of the profiles were closely investigated at both major and minor scales. Results were analyzed using ANOVA to determine the influence of each factor and a model was developed to predict the strength retention of profiles after exposure to thermal cycles. The results showed that the thermal cycles have a significant effect on the strength of the resin and a minor effect on the strength of the fibers. Bending specimens experienced a lower strength loss along their principal weak axis than that along their strong axis after conditioning. Tension specimens performed better in comparison to compression specimens in terms of strength retention after thermal exposure. These results are expected to contribute significantly toward the understanding of the influence of thermal cycles on the behavior of GFRP profiles.
机译：这项研究调查了热循环对不同几何形状的GFRP拉挤型材的力学性能的影响。弯曲试样由I形和U形截面组成，分别沿其主要的弱轴和强轴进行了三点弯曲测试，而箱形轮廓和层压板分别用于压缩和拉伸测试。每个标本都暴露于-20摄氏度和20摄氏度之间的一系列热循环中。在主要和次要尺度上都对剖面的破坏模式进行了仔细研究。使用ANOVA分析结果以确定每个因素的影响，并开发了一个模型来预测暴露于热循环后的轮廓强度保持率。结果表明，热循环对树脂的强度有显着影响，而对纤维的强度则有较小的影响。调节后，弯曲试样的主弱轴强度损失比强轴低。就热暴露后的强度保持而言，拉伸试样的性能优于压缩试样。预期这些结果将对理解热循环对GFRP轮廓行为的影响做出重大贡献。

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