用于检测导电材料残余应力的电磁声传感器和方法

IF 1 4区 工程技术 Q4 INSTRUMENTS & INSTRUMENTATION
MAPAN Pub Date : 2024-07-01 DOI:10.1007/s12647-024-00762-1
Bishan Kumar, Nitin Dhiman, Piyush, Sanjay Yadav, P. K. Dubey
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引用次数: 0

摘要

在工业应用中,轨道、管道或金属结构中存在的残余应力是测量的关键。持续使用这些存在残余应力的部件可能会随着时间的推移而恶化。如果应力水平超过某个临界值,结构就会受损,有时甚至会导致致命事故。现有的残余应力测量方法,如钻孔和应变仪,都具有破坏性。而 X 射线和中子衍射方法也有其固有的缺点。声双折射已被证明是一种强大的残余应力测量技术。该技术使用两个正交极化剪切波的超声波传播速度。目前,两个独立的电磁声换能器(EMAT)线圈交替用于产生和测量正交极化的超声波传播速度,或者使用同一个电磁声换能器在 0° 时进行测量,然后旋转 90°。在本研究中,提出了基于单线圈的 EMAT 设计方案,它能够同时在物体中产生两个正交偏振超声剪切波。EMAT 产生的接收信号是由于存在残余应力而以不同速度传播的两个波的叠加结果。只需测量回波持续时间,就能估算出速度的变化以及残余应力。与传统的双 EMAT 方法相比,所开发的 EMAT 具有多种优势,例如在单次采集中可快速、直接地估算速度变化,从而估算残余应力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Electromagnetic Acoustic Transducer and Method for Residual Stress Detection in Conducting Materials

Electromagnetic Acoustic Transducer and Method for Residual Stress Detection in Conducting Materials

Residual stress present in rail, pipes or metallic structures used in industrial application is crucial to measure. Continuous use of these parts with residual stress may result in deterioration with time. If stress level crosses a certain threshold, then the structure may get damaged and sometimes result in fatal accident. Existing methods of residual stress measurement such as hole drilling and strain gauge are destructive in nature. Whereas, X-ray and neutron diffraction methods have their own inherent drawbacks. Acoustic birefringence has been proved as a powerful technique for the residual stress measurement. The technique, uses ultrasonic propagation velocity of two orthogonal polarized shear waves. Presently, two separate electromagnetic acoustic transducer (EMAT) coils are alternately used for the generation and measurement of ultrasonic propagation velocities in orthogonal polarizations or same EMAT is used for the measurement at 0° and then by rotating 90°. In the present work, the design of single coil based EMAT is proposed which is capable of generating simultaneously two orthogonally polarized ultrasonic shear waves in the object. The received signal generated by EMAT is the resultant superimposition of two waves traveling at different velocities due to residual stress present. The change in velocity and thereby present residual stress is estimated by simply measuring the echo duration. The developed EMAT provides various advantages over conventional two EMAT approach such as fast and direct estimation of change in velocity and thus residual stress in single acquisition.

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来源期刊
MAPAN
MAPAN 工程技术-物理:应用
CiteScore
2.30
自引率
20.00%
发文量
91
审稿时长
3 months
期刊介绍: MAPAN-Journal Metrology Society of India is a quarterly publication. It is exclusively devoted to Metrology (Scientific, Industrial or Legal). It has been fulfilling an important need of Metrologists and particularly of quality practitioners by publishing exclusive articles on scientific, industrial and legal metrology. The journal publishes research communication or technical articles of current interest in measurement science; original work, tutorial or survey papers in any metrology related area; reviews and analytical studies in metrology; case studies on reliability, uncertainty in measurements; and reports and results of intercomparison and proficiency testing.
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