Campus Units

Aerospace Engineering, Mechanical Engineering, Center for Nondestructive Evaluation (CNDE)

Document Type

Conference Proceeding

Conference

42nd Annual Review of Progress in Quantitative Nondestructive Evaluation

Publication Version

Published Version

Publication Date

2016

Journal or Book Title

AIP Conference Proceedings

Volume

1706

Issue

1

First Page

070009

DOI

10.1063/1.4940527

Conference Title

42nd Annual Review of Progress in Quantitative Nondestructive Evaluation

Conference Date

July 26-31, 2015

City

Minneapolis, MN

Abstract

Many factors can cause residual stresses in industry, like rolling, welding and coating. Residual stresses can have both benefits and shortcomings on components, so it is important to find the residual stresses out and enhance its benefits part and get rid of its harmful part. There are many methods for residual stresses detection and ultrasonic method turns out to be a good one for it is nondestructive, relative cheap and portable. The critically refracted longitudinal (LCR) wave is widely used for it is regarded most sensitive to stress and less sensitive to texture which can influence detection results. Ultrasonic methods for residual stresses detection are based on time of flight (TOF) measurement, but because the measurement should reach nanosecond to show stress change, there are many other factors that can influence TOF, like temperature, texture of the components and even the thickness of the couplant. So increasing the TOF’s sensitivity to stress is very important. In this paper the relationships between velocity and frequency are studied experimentally[6] for different Lamb modes, under various stress loadings. The result shows that the sensitivity of different modes various a lot, the A1 mode is the most sensitivity, compared to S0, S1 and A0 modes; if the force is added to 100 MPa, the change stress of A1 mode can be as large to 80 m/s, which is about 10 times more sensitive than the traditional bulk wave. This makes it as a good choice for residual stress detection.

Comments

This proceeding may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This proceeding appeared in Pei, Ning, and Leonard J. Bond. "Experimental study of the acoustoelastic Lamb wave in thin plates." AIP Conference Proceedings 1706, no. 1 (2016): 070009. DOI: 10.1063/1.4940527. Posted with permission.

Copyright Owner

AIP Publishing, LLC

Language

en

File Format

application/pdf

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