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Experimental Study on Interfacial Bond Behavior between CFRP Sheets and Steel Plates under Fatigue Loading

机译：疲劳荷载下碳纤维布与钢板界面粘结性能的实验研究

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摘要

Using carbon fiber reinforced polymer (CFRP) composites for enhancing the fatigue behavior of the steel structures will be an important application. As the most critical part, the fatigue behavior of the CFRP-to-steel bonded interface directly determines the strengthening effect of steel structures reinforced by CFRP. In this paper, a series of CFRP-to-steel double-shear specimens are performed in order to study the interfacial bond behavior between CFRP and steel under fatigue loading. Two parameters are considered: the upper bound value and the lower bound value of the fatigue loading. An analysis of test results indicates that the crack development rate increases with the increment of the stress ratio or stress level and the crack development process includes two phases: crack stable development phase and debonding failure phase. A calculation model is put forward to describe the relationship between the crack development rate and the stress level. Besides, it can be obtained from the test results that the fatigue lives of the specimens decrease with the increment of the stress level. The empirical formula of S-N curve based on the form of single logarithm formula is proposed and the fatigue limit under the experimental conditions in this paper is determined to be 0.343 by computational analysis.
机译：使用碳纤维增强聚合物（CFRP）复合材料来增强钢结构的疲劳性能将是重要的应用。作为最关键的部分，CFRP与钢的粘结界面的疲劳行为直接决定了CFRP加固的钢结构的强化效果。为了研究疲劳载荷下CFRP与钢之间的界面粘结行为，本文进行了一系列的CFRP与钢的双剪切试样。考虑两个参数：疲劳载荷的上限值和下限值。试验结果分析表明，裂纹扩展速率随应力比或应力水平的增加而增加，裂纹扩展过程包括两个阶段：裂纹稳定扩展阶段和脱胶破坏阶段。提出了一种计算模型来描述裂纹扩展速率与应力水平之间的关系。此外，从测试结果可以看出，试样的疲劳寿命随着应力水平的提高而降低。提出了基于单对数公式的S-N曲线经验公式，并通过计算分析确定了实验条件下的疲劳极限为0.343。

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