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拉挤单向碳/玻璃纤维增强混杂筋弯曲徐变性能的试验研究

Experimental Study on the Flexural Creep Behaviors of Pultruded Unidirectional Carbon/Glass Fiber-Reinforced Hybrid Bars.

作者信息

Mayookh Lal Hiran, Xian Guijun, Thomas Sabu, Zhang Lei, Zhang Zhonghui, Wang Huili

机构信息

School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China.

International and Inter University Centre for Nanoscience and Nanotechnology (IIUCNN), Mahatma Gandhi University, Kerala 686560, India.

出版信息

Materials (Basel). 2020 Feb 21;13(4):976. doi: 10.3390/ma13040976.

DOI:10.3390/ma13040976
PMID:32098232
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7078702/
Abstract

Unidirectional pultruded glass/carbon hybrid fiber-reinforced polymer (HFRP) bars with a diameter of 19 mm have recently been developed for various structural applications. In this study, the creep behavior of HFRP bars caused by bending was experimentally evaluated under different conditions. Our creep study included freeze-thaw preconditioned and unconditioned HFRP bars. The rate of strain and deflection were monitored continuously for a duration of 5000 h. The bars were further tested for creep under the combined effects of mechanical loading and induced thermal cycles, while continuously monitoring the strain rate. Stress levels of 50% to 70% were selected for our creep study. The creep behavior of the bars was analyzed utilizing Findley's power-law model. On the basis of the linear approximation of Findley's power law, modulus reductions of approximately 21%, 19%, and 10.75% were calculated for combined freeze-thaw/creep-loaded, freeze-thaw pretreated, and unconditioned HFRP bars, respectively, over a service period of 50 y. The time-dependent deflection of HFRP bars was analyzed by coupling Findley's power-law model with Euler Bernoulli's beam theory. The creep deflection intensified by 26.6% and 11.1% for preconditioned and untreated bars, respectively, after a service period of 50 y. The microstructures of HFRP bars was also examined utilizing scanning electron microscopy.

摘要

最近开发出了直径为19毫米的单向拉挤玻璃/碳混合纤维增强聚合物（HFRP）棒材，用于各种结构应用。在本研究中，对不同条件下弯曲引起的HFRP棒材的徐变行为进行了实验评估。我们的徐变研究包括经过冻融预处理和未经处理的HFRP棒材。持续监测应变速率和挠度5000小时。进一步测试棒材在机械加载和诱导热循环联合作用下的徐变，同时持续监测应变速率。在我们的徐变研究中选择了50%至70%的应力水平。利用芬德利幂律模型分析了棒材的徐变行为。根据芬德利幂律的线性近似，在50年的使用期内，计算出经过冻融/徐变加载、冻融预处理和未经处理的HFRP棒材的模量分别降低约21%、19%和10.75%。通过将芬德利幂律模型与欧拉·伯努利梁理论相结合，分析了HFRP棒材随时间变化的挠度。在50年的使用期后，预处理棒材和未处理棒材的徐变挠度分别增加了26.6%和11.1%。还利用扫描电子显微镜检查了HFRP棒材的微观结构。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4f28/7078702/d1cca73863d1/materials-13-00976-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4f28/7078702/0b1b55b8849f/materials-13-00976-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4f28/7078702/d1cca73863d1/materials-13-00976-g014.jpg

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