基于非线性波调制CFRP板冲击损伤的检测研究

Impact damage detection in CFRP composites by nonlinear acoustic wave modulation

文中用非线性波调制法检测CFRP板中由钢珠冲击产生的损伤;通过压电晶片CFRP板中激励低频振动和高频载波,研究冲击损伤、振动、波之间的相互作用;采用损伤指数评价板内不同程度的冲击损伤,分析非线性波调制强度的影响因素.结果表明在冲击作用下CFRP板内非线性波调制强度逐步增强,损伤指数与冲击次数成指数衰减规律;检测时应尽可能提高低频振动激励电压以提高非线性波调制法对微损伤的检出能力.

A novel damage detecting methodology, based on nonlinear acoustic wave modulation spectroscopy, is employed for detection of impact damages in CFRP composite plates. The low-frequency vibration and high-frequency acoustic wave were excited by piezo-ceramic wafers with different sizes. The interactions between impact damage, vibration and wave were studied. The damage index ( DI ) was established to evaluate the damage in composite plate induced by the impacts of weight dropping. Furthermore, the factors influencing intensity of modulation were also analyzed. The results show that the intensity of modulation enhances with the impact times, and damage index has the exponential decay relation with the impact times. In order to improve the detecting capacity of micro-damage, the exciting voltage of low-frequency vibration should be amplified as large as possible.