Non-linear Ultrasonic NDE of Titanium Diffusion Bonds
Non-linear Ultrasonic NDE of Titanium Diffusion Bonds
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DOI：
10.1007/s10921-013-0217-5
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发表时间：
2014-06-01
影响因子：
2.8
通讯作者：
Nagy, Peter B.
中科院分区：
文献类型：
--
作者：
Escobar-Ruiz, Edwill;Ruiz, Alberto;Nagy, Peter B.
扩散连接是一种极具吸引力的固态焊接技术，在航空航天工业中是减轻重量和提高性能的宝贵工具。然而，由于缺乏强大的无损检测技术来克服这些重要材料的结晶学各向异性，它在钛组件中的充分开发目前受到限制。以前已经探索过先进的超声波技术，但它们对缺陷的敏感性受到它们所依赖的线性声学现象的限制。非线性超声方法已被证明比其线性方法对这些类型的缺陷更敏感，但抑制对界面的非线性响应的外部贡献并不是微不足道的。这里提出了一种成功地抑制这种贡献的方法。这项技术基于超声波的非共线混合，产生光谱、模式和空间上可分离的第三波，用于可靠地表征一组使用传统超声波方法无法确定键合质量的样品。
Diffusion bonding is an attractive solid-state welding technique that represents a valuable tool for reducing weight and improving performance in the aerospace industry. However, its full exploitation in titanium components is currently limited by a lack of robust NDE techniques capable of overcoming the crystallographic anisotropy of these important materials. Advanced ultrasonic techniques have been explored previously, but their sensitivity to imperfections is limited by the linear acoustic phenomena on which they depend. Non-linear ultrasonic methods have been shown to be significantly more sensitive than their linear counterparts to these types of imperfections, but suppressing extraneous contributions to the non-linear response of the interface is not trivial. An approach that succeeds in suppressing such contributions is presented here. The technique, which is based on the non-collinear mixing of ultrasonic waves to generate a spectrally, modally and spatially dissociable third wave, was used to reliably characterise a set of samples whose bond quality was indeterminable using conventional ultrasonic methods.