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首页> 外文期刊>Engineering Fracture Mechanics >Intralaminar fracture mechanism in unidirectional CFRP composites part I: Intralaminar toughness and AE characteristics
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Intralaminar fracture mechanism in unidirectional CFRP composites part I: Intralaminar toughness and AE characteristics

机译：单向CFRP复合材料的腹腔内断裂机理第一部分：腹腔内韧性和AE特性

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摘要

Three types of representative carbon fiber reinforced unidirectional composite materials were used and their intralaminar fracture behavior was investigated using the double-cantilever beam specimen with a simultaneous acoustic emission measurement. The intralaminar fracture toughness was evaluated by both the compliance method and energy area method. As a result, it was found that the intralaminar fracture toughness without bridging fibers had a constant value during crack propagation but it increased greatly when bridging fibers were present. The effect of bridging fibers on the intralaminar fracture toughness was estimated quantitatively by cutting the bridging fibers. Distinct differences in load-displacement curves, compliance, crack propagating behavior and acoustic emission signal characteristics between these three types of unidirectional composite materials were observed. It was also found that bridging fiber failure generated relatively large power spectra and contributed to the peak frequencies of 600-700 kHz in the spectrum analysis of acoustic emission (AE) signals. This suggested that the bridging fibers were also an important source of AE signals. Furthermore, a linear relationship between crack length and normalized cumulative AE event count rate was obtained.
机译：使用三种类型的代表性碳纤维增强单向复合材料，并使用双悬臂梁样本同时进行声发射测量，研究了其层内断裂行为。层内断裂韧性通过顺应性法和能量面积法进行评价。结果发现，在裂纹扩展过程中，没有桥接纤维的层内断裂韧性具有恒定值，但是当存在桥接纤维时，其韧性大大提高。通过切割桥接纤维来定量评估桥接纤维对层内断裂韧性的影响。观察到这三种类型的单向复合材料在载荷-位移曲线，顺应性，裂纹扩展行为和声发射信号特性方面存在明显差异。还发现在声发射（AE）信号的频谱分析中，桥接光纤故障会产生相对较大的功率谱，并导致600-700 kHz的峰值频率。这表明桥接纤维也是AE信号的重要来源。此外，获得了裂纹长度与标准化累积AE事件计数率之间的线性关系。

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