首页|新型液晶聚芳酯纤维编织增强碳纤维复材筋抗剪抗弯性能研究

新型液晶聚芳酯纤维编织增强碳纤维复材筋抗剪抗弯性能研究

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碳纤维增强复合材料(CFRP)因其轻质、高强、耐腐蚀、抗疲劳和低蠕变等优点,具有制成预应力筋在预应力结构中替代钢筋的潜力.然而,拉挤成型 CFRP 筋的横向剪切和弯折性能不足,限制了其在预应力结构中的应用.液晶聚芳酯(LCP)纤维以其良好的力学性能和尺寸稳定性著称,尤其在抗剪防割性能方面表现优异,已在防护服装、体育用品和航空领域得到应用.本研究旨在通过外层编织LCP 纤维来增强拉挤成型 CFRP 筋的剪切和弯曲性能,提升 CFRP 筋在预应力结构中的适用性.开展了LCP 纤维编织增强不同纤维含量(55%和 65%)CFRP 筋的剪切试验和三点弯曲试验,探明了LCP 新材料与拉挤-编织成型新工艺对 CFRP 筋的抗剪和抗弯性能的提升效果.结果表明:外层编织LCP 纤维能显著提高拉挤成型CFRP 筋的抗剪和抗弯强度及延性;与未编织相比,编织后纤维含量 55%和 65%的CFRP 筋抗剪强度分别提高了 54.6%和 55.0%,剪切荷载峰值变形分别提高了 10.4%和 38.5%;抗弯强度分别提高了 26.6%和 14.9%,弯曲荷载峰值变形分别提高了 13.1%和 38.8%.总体而言,随着CFRP 筋纤维体积含量的增加,编织带来的性能提升效果随之增强.本研究可为LCP 纤维编织增强CFRP 筋在预应力结构中的应用提供参考.
Research on Shear and Bending Performance of Novel LCP-Fiber-Braided Reinforced CFRP Tendons
Carbon fiber reinforced polymer composites(CFRP)are candidates for prestressing tendons due to their advantages over rebars,such as lighter weight,higher strength,and resistance to corrosion,fa-tigue,and creep.However,the transverse shear and bending properties of pultruded CFRP tendons are in-sufficient for their widespread application in prestressed structures.Liquid crystal polyarylate(LCP)fi-bers,known for their excellent mechanical properties and dimensional stability,particularly in shear and cut resistance,are used in various industries including protective clothing,sports equipment,and aero-space.This study aimed to enhance the shear and flexural properties of pultruded CFRP tendons by incor-porating braided LCP fibers in the outer layer,thereby improving their suitability for prestressed structures.Shear and three-point bending tests were conducted on CFRP tendons with different fiber volumes(55%and 65%)reinforced with braided LCP fibers.The goal was to assess the impact of the LCP material and the pultrusion-braiding process on the shear and bending characteristics of CFRP tendons.The findings in-dicate that the braided LCP fibers significantly improved the shear and flexural strength and ductility of pul-truded CFRP bars.The shear strengths of the braided CFRP tendons with 55%and 65%fiber content in-creased by 54.6%and 55.0%,respectively,and the shear peak deformations increased by 10.4%and 38.5%,respectively.Similarly,the flexural strengths increased by 26.6%and 14.9%,and the bending peak deformations increased by 13.1%and 38.8%,respectively.In general,the performance enhance-ment achieved through braiding with an increase in the volume content of CFRP reinforcement fibers.This research offers valuable insights for the use of LCP-fiber-braided reinforced CFRP tendons in prestressed concrete applications.

carbon fiber reinforced polymer compositeliquid crystal polyarylate fiberpultrusion-braidingmechanical propertiesexperimental study

荚瑞馨、刘越

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北京工业大学建筑工程学院,北京 100124

北京科技大学土木与资源工程学院,北京 100083

碳纤维增强复合材料 液晶聚芳酯纤维 拉挤-编织成型 力学性能 试验研究

2024

10.3724/j.gyjzG24091101

工业建筑
中冶建筑研究总院有限公司

工业建筑

CSTPCD
影响因子：0.72
ISSN：1000-8993
年,卷(期)：2024.54(12)