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首页> 外文期刊>Engineering Fracture Mechanics >Intralaminar fracture mechanism in unidirectional CFRP composites part II: analysis
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Intralaminar fracture mechanism in unidirectional CFRP composites part II: analysis

机译：单向CFRP复合材料的腹腔内骨折机理第二部分：分析

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摘要

Three kinds of representative carbon fiber reinforced unidirectional composite materials are used, and their intralaminar fracture behavior is investigated by using the double-cantilever beam (DCB) specimen with a simultaneous acoustic emission measuring. In Part I, the experimental results on the crack propagation, the bridging fibers, the intralaminar fracture toughness acoustic emission characteristics and microscope observations were obtained. Here, we use a bridging fiber model to analyze the debonding force acting on a bridging fiber and try to estimate the number of bridging fibers during the crack propagating process. At the same time, the intralaminar fracture toughness is calculated by both the adhesive force model and the finite element analysis. As a result, it is found that the intralaminar fracture toughness without the bridging fibers will have a constant value during the crack propagation, but it increases greatly when bridging fibers exist. It is clear that the bridging fibers play an important role in the intralaminar fracture toughness. The debonding forces acting on the bridging fibers and the number of bridging fibers are obtained. Furthermore, the quantitative estimation of the increment of the intralaminar fracture toughness contributed by bridging fibers is made according to the adhesive force model and it is comparable with the results obtained by the finite element analysis.
机译：使用三种具有代表性的碳纤维增强单向复合材料，并使用双悬臂梁（DCB）标本并同时进行声发射测量，研究了它们的层内断裂行为。在第一部分中，获得了裂纹扩展，桥接纤维，层内断裂韧性声发射特性和显微镜观察的实验结果。在这里，我们使用桥接纤维模型来分析作用在桥接纤维上的脱粘力，并尝试估计裂纹扩展过程中桥接纤维的数量。同时，通过粘合力模型和有限元分析来计算层内断裂韧性。结果发现，没有桥接纤维的层内断裂韧性在裂纹扩展过程中将具有恒定值，但是当存在桥接纤维时，其韧性大大提高。显然，桥接纤维在层内断裂韧性中起重要作用。获得了作用在桥接纤维上的剥离力和桥接纤维的数量。此外，根据粘合力模型对由桥接纤维造成的层内断裂韧性的增量进行了定量估计，这与通过有限元分析获得的结果相当。

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