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Modelling and measurement of the nonlinear behaviour of kissing bonds in adhesive joints

机译：粘接接头中接吻非线性行为的建模与测量

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摘要

The non-destructive evaluation of adhesively bonded joints is a subject of significant industrial and academic interest. It is thought that areas of interfacial weakness develop firstly into kissing bonds before finally disbonding. Critically, there is a requirement to detect such defects at the earliest possible stage. Whilst a number of techniques such as high frequency ultrasonic C-scanning are able to robustly detect disbonding, the detection of interfacial weakness has proved elusive. In this paper we focus our attention on the kissing bond state, which we consider to be a bond still in intimate contact, but with zero, or minimal, strength. Various researchers have shown that kissing bonds of this type behave nonlinearly when illuminated with ultrasound and have sought to make this the basis of a non-destructive evaluation procedure. In this paper we use a one-dimensional time domain model that includes an interfacial nonlinearity to predict the interaction of ultrasonic pulses with a kissing bond. With this model we show that the measured nonlinearity is highly dependent on the thickness of the adhesive layer to wavelength ratio. These effects are explained by the observation that the linear dynamics of the multi-layer bonded system act as a series of bandpass filters on the nonlinear signals generated at the kissing interface. It is suggested that, in order to make robust nonlinear measurements, these filtering characteristics should be known and compensated for.
机译：粘合接头的非破坏性评估是具有重大工业和学术意义的主题。据认为，界面无力的区域首先发展为接吻键，然后最终脱离。至关重要的是，需要尽早发现此类缺陷。尽管许多技术（例如高频超声C扫描）能够可靠地检测脱胶，但已证明难以检测到界面缺陷。在本文中，我们将注意力集中在亲吻结合状态上，我们认为这是仍然紧密接触但强度为零或最小的结合。各种各样的研究人员已经表明，这种类型的接吻键在受到超声波照射时会表现出非线性，并试图以此为基础进行无损评估。在本文中，我们使用包含界面非线性的一维时域模型来预测超声脉冲与吻合键的相互作用。通过该模型，我们表明，所测量的非线性度高度依赖于粘合剂层的厚度与波长之比。观察到以下现象可以解释这些效果：多层结合系统的线性动力学在接吻界面产生的非线性信号上充当一系列带通滤波器。建议为了进行鲁棒的非线性测量，应该知道并补偿这些滤波特性。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.18-25|共8页
  • 作者

    Dawei Yan; Simon A. Neild; Bruce W. Drinkwater;

  • 作者单位

    Department of Mechanical Engineering, University of Bristol, University Walk, Bristol, BS8 1TR, UK;

    Department of Mechanical Engineering, University of Bristol, University Walk, Bristol, BS8 1TR, UK;

    Department of Mechanical Engineering, University of Bristol, University Walk, Bristol, BS8 1TR, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    adhesive bond; nonlinearity; ultrasonics; interface; kissing bond;

    机译：胶粘剂非线性超声波接口;接吻债券;

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