Analysis of Compressive Fracture Process in 3D Braided Composites by Acoustic Emission
YAN Shi1,2, LI Dong-hua2, PAN Shi-dong1, FENG Ji-cai1
1. Research Station on Material Science and Engineering for Postdoctoral Fellows, Harbin Institute of Technology, Harbin 150001, China;
2. School of Architecture and Civil Engineering, Harbin University of Science and Technology, Harbin 150080, China
Abstract：The fracture process of 3D four-directional carbon/epoxy braided composites with different braiding angles under the monotonic compressive loading were investigated by the acoustic emission (AE) technique. The cumulative AE energy, event rate, amplitude, and the peak frequency of a dominant frequency band after treated with the fast Fourier transform (FFT) were analyzed. At the same time, combining with the load-displacement curve varying feature, the fracture processes were divided into different stages to deeply understand the damaged mechanisms of the textile composites. Furthermore, the fracture surfaces of the specimens were observed under optical microscopy. Results reveal that the behavior of AE parameters described well the fracture process in the 3D braided composites with different braiding angles, and the damage mechanisms of the composites can be successfully identified by AE characteristics.
严实, 李冬华, 泮世东, 冯吉才. 基于声发射技术的三维编织复合材料压缩破坏分析[J]. 材料工程, 2013, (2): 22-28.
YAN Shi, LI Dong-hua, PAN Shi-dong, FENG Ji-cai. Analysis of Compressive Fracture Process in 3D Braided Composites by Acoustic Emission. Journal of Materials Engineering, 2013, (2): 22-28.