Experimental investigation of the three-point bending fatigue properties of carbon fiber composite laminates

Advances in Materials Sciences Pub Date : 2016-07-22 DOI:10.26789/AMS.2017.01.003

Tao Yang, M. He, X. Niu, Y. Du

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引用次数: 9

Abstract

The three-point bending fatigue properties of carbon fiber epoxy matrix composite laminates were compared for fatigue loading stress levels of 75, 80 and 85%, and fatigue loading frequencies of 10, 15 and 20 Hz, respectively. The experimental results showed that the bending fatigue life of the composites obviously decreased with the increase of the fatigue loading stress level or the loading frequency. The fatigue damage accumulation process could be divided into three distinct stages according to the accumulation rate: fast, slow and then fast. When the loading stress level was increased from 75 to 85%, the duration of the third stage decreased from 40 to 10% of the overall fatigue life. When the loading frequency was increased from 10 to 20 Hz, the duration of the third stage increased from 20 to 40% of the overall fatigue life. Matrix cracking, fiber breaking, interface debonding and delamination were identified as the main three-point bending fatigue damage modes of the carbon fiber composite material, and the stress level and the loading frequency were found to significantly influence the fatigue failure properties of the composites.

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碳纤维复合材料层合板三点弯曲疲劳性能的试验研究

对比了碳纤维环氧基复合材料层合板在75、80和85%的疲劳加载应力水平和10、15和20 Hz的疲劳加载频率下的三点弯曲疲劳性能。试验结果表明，随着疲劳加载应力水平和加载频率的增加，复合材料的弯曲疲劳寿命明显降低。根据疲劳损伤积累速率的不同，可将疲劳损伤积累过程分为快、慢、快三个阶段。当加载应力水平从75%增加到85%时，第三阶段的持续时间从总疲劳寿命的40%减少到10%。当加载频率从10 Hz增加到20 Hz时，第三阶段的持续时间从总疲劳寿命的20%增加到40%。确定了基体开裂、纤维断裂、界面脱粘和分层是碳纤维复合材料的主要三点弯曲疲劳损伤模式，应力水平和加载频率对复合材料的疲劳破坏性能有显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Advances in Materials Sciences

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