Study of the Tensile Properties of CFRP Strengthened Steel Plates
Study of the Tensile Properties of CFRP Strengthened Steel Plates
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DOI：
10.3390/polym7121537
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发表时间：
2015-12-01
期刊：
影响因子：
5
通讯作者：
Zhu, Tao
中科院分区：
文献类型：
--
作者：
Lu, Yiyan;Li, Weijie;Zhu, Tao
本文介绍了碳纤维增强聚合物（CFRP）薄板加固钢板在拉伸载荷作用下的试验结果。研究了CFRP层数（1 - 4层）、强化方案（单面和双面粘合）和温度（25 - 120摄氏度）。结果表明：CFRP层数和加固方案对试件破坏模式影响不显著；温度低于T-g + 10℃和20℃（T-g为玻璃化转变温度）时树脂基体的降解是主要的失效模式，温度高于此温度时树脂基体的体积减小是主要的失效模式。通过CFRP粘结，试件的极限荷载和弹后刚度均有显著提高。然而，CFRP层数的增加也会导致增强和加劲效率的降低。双面强化试样的力学性能优于单面强化试样。随着温度的升高，极限载荷和后弹性刚度显著降低。分别进行了常温和高温下力学性能的分析建模。试验数据验证了模型的正确性。
This paper presents the experimental results of steel plates strengthened with carbon fiber reinforced polymer (CFRP) sheets under tensile load. The number of CFRP layers (ranging from one to four), strengthening schemes (single-sided and double-sided bonding), and temperatures (ranging from 25 to 120 degrees C) were investigated. Results showed that the number of CFRP layers and strengthening schemes had insignificant effects on failure modes of specimens. The failure modes were dominated by the degradation of resin matrix at temperatures lower than T-g + 10 or 20 degrees C, where T-g is the glass transition temperature, and were dominated by the volume decrease of resin matrix at temperatures above that. Through bonding CFRP sheets, the ultimate load and post-elastic stiffness of specimens were significantly increased. However, the increase in the number of CFRP layers also led to the decrease in strengthening and stiffening efficiency. The double-sided strengthened specimens showed more preferable mechanical properties than the single-sided strengthened specimens. As temperature increased, significant decreases in ultimate load and post-elastic stiffness were observed. Analytical modeling to predict the mechanical properties at ambient and elevated temperatures were conducted, respectively. The modeling results were verified by the test data.