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板中孔状缺陷的超声导波检测试验研究

Keywords: 超声导波,频散,模态

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Abstract:

为了实现对板类结构的主动健康监测,采用附着在结构上的压电陶瓷晶片激励和接收导波模态,选取合适模态用于板中缺陷的识别和评估.理论分析结果表明,在低频范围内,相对于A0模态,以面内位移为主、频散小的S0模态更适合于铝板的缺陷检测.利用直径11mm,厚0.4mm的压电陶瓷晶片在1mm厚的铝板上激励和接收得到适合缺陷检测的频率300kHz的S0模态.在此基础上,在铝板中加工一孔状缺陷,分析了S0模态的缺陷检测能力,并进一步研究了缺陷直径对接收到的导波信号幅度的影响.实验结果表明,利用一发一收法得到的Lamb波模态可以用于铝板中的缺陷检测,并且缺陷回波的幅度可实现对缺陷大小的表征.

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