C-C Fatigue Testing for Impacted Woven-type CFRP Samples

A large woven-type CFRP plate with a thickness of 5.5 mm has been sampled according to ASTM D7136 for CAI testing and subjected to compression-compression (C-C) fatigue testing until failure. 6-PZT transducers are distributed linearly in 3-top 3-bottom configuration. The acquisition step of the experiment is achieved through multiple data acquisition systems: GW, EMI, digital image correlation (DIC), and pulse-echo ultrasonic C-scan. The equipment list in the GW &amp; EMI unit consists of a signal generator, EMI analyzer, multiplexor, oscilloscope, and computer. <br>本研究采用一块厚度为5.5 mm的大型编织型碳纤维增强复合材料（Carbon Fiber Reinforced Polymer, CFRP）板材，依据ASTM D7136标准取样以开展冲击后压缩（Compression After Impact, CAI）测试，并对其实施压缩-压缩（C-C）疲劳测试直至试样失效。6个锆钛酸铅（Lead Zirconate Titanate, PZT）传感器采用3上3下的布局呈线性排布。本实验的数据采集环节通过多套数据采集系统完成：导波（Guided Wave, GW）、电磁阻抗（Electromagnetic Impedance, EMI）、数字图像相关（Digital Image Correlation, DIC）以及脉冲回波式超声C扫描技术。导波与电磁阻抗采集单元所配套的设备包括信号发生器、电磁阻抗分析仪、多路复用器、示波器与计算机。