中文摘要：

实验研究了不同编织工艺参数的三维六向碳/环氧编织复合材料在不同冲击能量作用下的低速冲击过程.测试过程中用声发射技术进行实时监测,分析了声发射能量,幅值和波形经过快速傅里叶变换后的峰值频率,并对典型信号的波形进行了频谱分析.结果表明AE参数能很好地描述三维编织复合材料的低速冲击损伤过程.

英文摘要：

The damage process of 3D six-directional carbon/epoxy braided composites with differentbraiding technological parameter under the low-velocity impact was investigated. The test procedurewas monitored by the acoustic emission （AE） technique. The AE energy, amplitude and the peak fre-quency of a dominant frequency band after treated with the fast Fourier transform （FFT） were ana-lyzed. And the waveforms of the type signals were discussed by spectral analysis. Results reveal thatthe behavior of AE parameters describes well the damage process on the low-velocity impact behavior.