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复合材料层压板在压缩破坏过程中包含了丰富的声发射信息。为了研究含冲击损伤的复合材料层压板的压缩破坏机制,采用声发射观察层压板的压缩破坏过程,通过分析声发射信号的特征规律,表征了在压缩载荷下材料损伤的形式及其演化过程。结果表明:通过对声发射参数(撞击计数、能量、幅值、事件位置)和载荷曲线进行综合分析,发现损伤的发展过程经过了初始阶段、平稳扩展期和断裂阶段,冲击造成的分层区域最先出现屈曲并最早破坏;在损伤初始阶段和平稳扩展期间,损伤是一种渐进式的增长,层压板具有一定的承载能力;在断裂阶段损伤快速扩展,层压板的承载能力迅速下降,在出现纤维密集断裂的现象后整体破坏。
Composite laminates contain a wealth of acoustic emission information during compression failure. In order to study the compressive failure mechanism of composite laminates with impact damage, the compression failure process of laminates was observed by acoustic emission. By analyzing the characteristic law of acoustic emission signals, the damage form and evolution process of composite under compressive load were characterized. The results show that through the comprehensive analysis of acoustic emission parameters (impact counting, energy, amplitude, event location) and load curve, it is found that the damage development process passes through the initial stage, the stable expansion stage and the fracture stage, The buckling is the first to occur and the first to be damaged. The damage is a gradual increase during the initial stage of damage and the steady expansion. The laminates have certain bearing capacity. The damage rapidly expands at the fracture stage, and the carrying capacity of the laminates decreases rapidly. The phenomenon of fiber-intensive fracture after the overall destruction.