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The impact of magnetostriction on the transduction of normal bias field EMATs

机译：磁致伸缩对正偏场EMATs传导的影响

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摘要

A very typical and important application of Electromagnetic Acoustic Transducers (EMATs) is the inspection of ferritic steels with normal bias field transducers. In this case, a controversy has arisen in the literature, as some older studies have indicated the Lorentz force as the main transduction mechanism, while more recent research has claimed that magnetostriction can be two order or magnitudes larger than the Lorentz effect. This is not merely an academic issue, as depending on which physical phenomena dominates, the performance of EMATs on different steel grades might significantly vary and the design of the transducer could be optimized accordingly. This paper analyzes in depth two main assumptions made in the more recent studies, highlighting some inconsistencies. A previously experimentally validated Finite Element model, is used to test the controversial assumptions. It is demonstrated that the mechanical boundary conditions were not modelled correctly leading to a gross overestimation of the role of magnetostriction. The main conclusion is that the magnetostriction force is typically not order of magnitudes larger than the Lorentz force; actually the Lorentz force is the larger transduction effect in non-oxidized ferromagnetic steels, and magnetostriction is only a fraction of it.
机译：电磁声换能器（EMAT）的一个非常典型且重要的应用是使用常规偏置场换能器检查铁素体钢。在这种情况下，文献中引起了争议，因为一些较早的研究表明洛伦兹力是主要的传导机制，而最近的研究声称磁致伸缩可能比洛伦兹效应大两个数量级或两个数量级。这不仅仅是一个学术问题，因为取决于哪种物理现象占主导地位，不同钢种上的EMAT的性能可能会发生显着变化，并且可以相应地优化换能器的设计。本文深入分析了最近研究中的两个主要假设，突出了一些矛盾之处。先前经过实验验证的有限元模型用于测试有争议的假设。结果表明，机械边界条件的建模不正确，导致对磁致伸缩作用的总体估计过高。主要结论是，磁致伸缩力通常不比洛伦兹力大一个数量级。实际上，洛伦兹力在非氧化铁磁钢中具有较大的传导效果，而磁致伸缩只是其中的一小部分。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.8-15|共8页
  • 作者

    R. Ribichini; P.B. Nagy; H. Ogi;

  • 作者单位

    UK Research Centre in NDE, Department of Mechanical Engineering, Imperial College, London SW7 2AZ, UK;

    UK Research Centre in NDE, Department of Mechanical Engineering, Imperial College, London SW7 2AZ, UK,School of Aerospace Systems, University of Cincinnati, Cincinnati, OH 45221, USA;

    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560, Japan;

  • 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

    electromagnetic acoustic transducers; magnetostrction; lorentz force; steel;

    机译：电磁声换能器;磁引力洛伦兹力钢;

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