Acoustic Emission Characteristics of the In-plane Shearing of Laminate in T700 Carbon Fiber Composite
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摘要: 为了研究碳纤维复合材料层合板面内剪切的破坏原理，对其损伤过程进行了声发射检测和有限元模拟。结果表明：碳纤维复合材料层合板面内剪切损伤形式和损伤演化过程与声发射特征参数（幅值、能量、撞击计数）具有相关性，损伤过程包括初始阶段、损伤累积阶段和断裂破坏阶段；在初始阶段和损伤累积阶段，损伤呈渐进式增长，试件具有一定的承载能力，在断裂破坏阶段，承载能力随大面积分层以及纤维断裂发生骤降。Abstract: Carbon fiber composite laminated plate in-plane shearing process contained a large number of acoustic emission information. In order to study the laminates shearing failure mechanism,the acoustic emission testing and finite element simulation of the damage process were carried out. The results showed that the shearing damage form and damage evolution process of the carbon fiber composite laminates are related to the acoustic emission characteristic parameters (amplitude, energy, impact count). The damage process was experienced in the initial stage, the damage accumulation stage and the fracture failure stage. In the initial stage and the damage accumulation stage, the damage increased gradually, and the specimen had a certain bearing capacity, whereas in the stage of fracture failure, the bearing capacity decreased sharply with the delamination and fiber breakage. Affected by the 45 fiber layers, the delamination area was small, and the front of damage was uneven and randomly distributed.
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