Nonlinear non-collinear ultrasonic detection and characterisation of kissing bonds
Nonlinear non-collinear ultrasonic detection and characterisation of kissing bonds
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DOI：
10.1016/j.ndteint.2018.07.003
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发表时间：
2018-10-01
影响因子：
4.2
通讯作者：
Blanloeuil, Philippe
中科院分区：
文献类型：
--
作者：
Alston, Jonathan;Croxford, Anthony;Blanloeuil, Philippe
理想情况下，开发具有成本效益且可靠的粘合结构需要采用无损检测方法来检测是否存在质量差、粘合力弱或接吻粘合的情况。如果这些键在拉伸时比在压缩时更柔顺，则应力应变非线性提供了使用非线性超声技术进行检测的可能途径。本文重点研究接吻粘合情况以及由此产生的界面接触声学非线性。通过两个铝块的压缩载荷产生接吻粘合。两个剪切波的非共线混合产生和频纵波是本研究中接触声非线性的模拟方法。非线性混合的参数空间是根据输入光束的相互作用角及其频率比来测量的，从而在光束重叠的区域中创建样品体积和界面特性的“指纹”。对经典非线性固体的散射指纹进行了分析建模，并对接吻界面进行了数值建模；将这些结果与实验测量值进行比较。实验界面在不同的界面负载下进行测试，导致散射幅度随着负载的增加而增加。随着负载的增加以及指纹图案的其他变化，参数空间中的次级峰值也出现。
The development of cost effective and reliable bonded structures ideally requires an NDT method to detect the presence of poor quality, weak bonds or kissing bonds. If these bonds are more compliant in tension than in compression stress-strain nonlinearities provide a possible route to detection with the use of nonlinear ultrasonic techniques. This paper focuses on the kissing bond case and the resulting contact acoustic nonlinearity of the interface. A kissing bond is created by compression loading of two aluminium blocks. Non-collinear mixing of two shear waves producing a sum frequency longitudinal wave is the method of stimulation of contact acoustic nonlinearity in this research. The parametric space of the nonlinear mixing is measured in terms of interaction angle of the input beams and the ratio of their frequencies creating a 'fingerprint' of the sample's bulk and interface properties in the region where the beams overlap. The scattering fingerprint of a classically nonlinear solid is modelled analytically and a kissing interface is modelled numerically; these results are compared with experimentally measured values. The experimental interface is tested with varied interfacial loading, resulting in an increase in scattering amplitude as load is increased. Secondary peaks in the parameter space also appeared as loading increased, as well as other changes in the fingerprint pattern.