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首页> 外文期刊>NDT & E International: Independent Nondestructive Testing and Evaluation >Measurement of the ultrasonic nonlinearity of kissing bonds in adhesive joints
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Measurement of the ultrasonic nonlinearity of kissing bonds in adhesive joints

机译：粘合剂接缝中超声非线性的测量

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This paper presents a study of the detectability of kissing bonds in adhesive joints using an ultrasonic inspection technique to measure nonlinearity. Kissing bonds are defined as adhesive bonding defects in which the adhesive and the substrate are not fully bonded together but are in some way connected, for example, through contact between disbonded surfaces or through coupling via a very thin layer of contaminant. The result is a region that exhibits reduced normal or shear stiffness and is difficult to detect using conventional non-destructive testing techniques. It is hypothesised that when an ultrasonic wave of large magnitude propagates through the kissing bond area, the system will behave nonlinearly. This hypothesis is the starting point for this paper, and it is tested by measuring the degree of nonlinearity exhibited by perfectly and imperfectly bonded specimens. Perfectly disbonded adhesive joints are tested over a range of compressive loads from an initial zero-load 'open' condition to a final highly loaded 'closed' condition and the degree of nonlinear behaviour measured. It is shown that adhesive joints exhibit significant nonlinearity under light compressive loads and that the level of nonlinearity decreases rapidly with compressive load. Good agreement is also observed between experimental results and a nonlinear spring model of the adhesive joint, based on its quasi-static interfacial stiffness.
机译：本文介绍了一种使用超声波检测技术来测量非线性的粘合接头中可接吻键的可检测性的研究。亲吻键被定义为粘合剂粘合缺陷，其中粘合剂和基材没有完全粘合在一起，而是以某种方式连接，例如通过脱胶表面之间的接触或通过非常薄的污染物层的耦合。结果是显示出法向刚度或剪切刚度降低并且难以使用常规无损检测技术检测到的区域。假设当大超声波通过接吻键合区域传播时，系统将表现出非线性特性。这个假设是本文的出发点，并且通过测量完美和不完全粘合的试样所表现出的非线性程度来进行检验。在从初始零载荷“打开”状态到最终的高载荷“闭合”状态的压缩载荷范围内，对完全脱开的粘合接头进行了测试，并测量了非线性行为的程度。结果表明，胶接点在轻压载荷下表现出明显的非线性，并且非线性水平随压载荷而迅速减小。基于准静态界面刚度，实验结果与胶粘接头的非线性弹簧模型之间也观察到了很好的一致性。

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