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首页> 外文期刊>Composite Structures >Fatigue performance of metallic beam strengthened with a bonded CFRP plate
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Fatigue performance of metallic beam strengthened with a bonded CFRP plate

机译：CFRP板加固金属梁的疲劳性能。

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This paper gives details of a fatigue test programme of a series of small-scale steel beams bonded with a carbon fibre reinforced polymer (CFRP) plate. Backface-strain technique was used to detect crack initiation and monitor crack growth. Results show that this technique could detect crack initiation and track the deterioration of the adhesive layer. The strains recorded show that crack initiates and grows in Mode Ⅰ earlier than in Mode Ⅱ in the bonded joints, and this finding agrees with the observations on double-lap joints published in literature. The strains recorded also show that the adhesive spew fillet at the end of the CFRP plate is beneficial to the fatigue performance, although the improvement is not significant. An S-N curve was developed from the test results. The curve correlates the maximum principal interfacial stress at the plate end to the number of cycles to crack initiation. This maximum stress can be calculated from the authors' previous analytical work. The fatigue limit of the S-N curve was found to be about 30% of the ultimate static failure stress.
机译：本文详细介绍了一系列用碳纤维增强聚合物（CFRP）板粘结的小型钢梁的疲劳测试程序。背面应变技术用于检测裂纹萌生和监测裂纹扩展。结果表明，该技术可以检测裂纹萌生并跟踪粘合剂层的劣化。所记录的应变表明，在粘结节理中，裂纹在Ⅰ型中比Ⅱ型更早地开始并扩展，这一发现与文献中关于双搭接接头的观察结果是一致的。记录的应变还表明，尽管改善并不显着，但CFRP板末端的粘合剂喷口圆角有利于疲劳性能。从测试结果中得出了一条S-N曲线。该曲线将板端的最大主界面应力与裂纹萌生的循环次数相关联。该最大应力可以根据作者先前的分析工作来计算。发现S-N曲线的疲劳极限约为最终静态破坏应力的30％。

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