ABSTRACT

Fundamental elements of wave mechanics are covered with respect to Acoustic Emission (AE) analysis in Nondestructive Evaluation (NDE) and Structural Health monitoring (SHM). Emphasis is placed on aspects of Ultrasonic Guided Waves that travel in a structure due to elastic wave emissions from a defect source as defects continue to grow. The AE Method is based on the emission of elastic waves from a particular source as failure is initiated – crack, corrosion, leak, and so on. The AE signal received is a function of the source orientation and location as well as wave velocities in the structure, sensor types and positions, arrival time differences, thicknesses of the structure, and specimen structural variations. Such topics as Guided wave physical and theoretical considerations, Ultrasonic Guided wave accomplishments, and enhanced AE by considering various guided wave concepts are discussed. The topic of Acousto-Ultrasonics and its impact on guided wave understanding is also reviewed. This paper illustrates how principles in Ultrasonic Guided waves can be applied to Acoustic Emission. Besides basic issues, Acoustic Emission enhancement possibilities are based on recent studies of Ultrasonic Guided Waves and the use of Shear Horizontal guided waves in Acoustic Emission along with an omni-directional shear horizontal wave transducer.

Editor’s note: Joseph L. Rose, PhD, is the recipient of the 2021 ASNT Research Recognition for Sustained Excellence. Rose presented on “Guided Wave Studies for Enhanced Acoustic Emission Inspection” during the ASNT Research Symposium which was held 27–29 April 2021.

摘要

波力学的基本要素涵盖在无损评估 (NDE) 和结构健康监测 (SHM) 中的声发射 (AE) 分析方面。重点放在超声波导波的各个方面，由于缺陷源的弹性波发射，随着缺陷的不断增长，这些波在结构中传播。AE 方法基于从特定来源发射的弹性波，当故障开始时——裂纹、腐蚀、泄漏等。接收到的 AE 信号是源方向和位置以及结构中的波速、传感器类型和位置、到达时间差异、结构厚度和样本结构变化的函数。例如导波物理和理论考虑、超声导波成就、讨论了通过考虑各种导波概念来增强 AE。还回顾了声-超声波及其对导波理解的影响这一主题。本文说明了如何将超声导波中的原理应用于声发射。除了基本问题之外，声发射增强的可能性基于最近对超声波导波的研究以及在声发射中使用水平剪切导波以及全向水平剪切波换能器。

编者按： Joseph L. Rose 博士是 2021 年 ASNT 持续卓越研究奖的获得者。罗斯在 2021 年 4 月 27 日至 29 日举行的 ASNT 研究研讨会上介绍了“用于增强声发射检测的导波研究”。