Abstract An ultrasonic non-destructive testing method is under development for detecting small scale damage in carbon fibre reinforced polymer. This method relies on signal processing to detect the presence of nonclassical nonlinear signature of microcracking or delamination in the material. Using reciprocal time reversal with nonlinear spectroscopy, the ultrasound can be focused on defect which is in unknown location in test object and may be far from the sending or the receiving transducer. With spectral analysis of defect and delayed time reversal input, the defect can be excited to larger displacement amplitudes by using its resonance. The study is conducted using finite element simulations in two dimensions for carbon fibre composite plate.

中文翻译：

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碳纤维增强聚合物缺陷超声时间反演数值模拟

摘要 一种用于检测碳纤维增强聚合物小尺度损伤的超声波无损检测方法正在开发中。这种方法依赖于信号处理来检测材料中微裂纹或分层的非经典非线性特征的存在。使用非线性光谱的倒数时间反转，超声可以聚焦在测试对象中未知位置并且可能远离发送或接收换能器的缺陷。通过对缺陷和延迟时间反转输入的光谱分析，可以利用其共振将缺陷激发到更大的位移幅度。该研究是使用碳纤维复合板的二维有限元模拟进行的。