Next Article in Journal
Mechanical Properties of ZTO, ITO, and a-Si:H Multilayer Films for Flexible Thin Film Solar Cells
Next Article in Special Issue
On-Line Multi-Damage Scanning Spatial-Wavenumber Filter Based Imaging Method for Aircraft Composite Structure
Previous Article in Journal
Preparation and Characterization of Polyurethanes with Cross-Linked Siloxane in the Side Chain by Sol-Gel Reactions
Previous Article in Special Issue
Optimal Electrode Selection for Electrical Resistance Tomography in Carbon Fiber Reinforced Polymer Composites
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle
Materials 2017, 10(3), 248; doi:10.3390/ma10030248

Necessary Conditions for Nonlinear Ultrasonic Modulation Generation Given a Localized Fatigue Crack in a Plate-Like Structure

Department of Civil and Environmental Engineering, KAIST, Daejeon 34141, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Victor Giurgiutiu
Received: 25 January 2017 / Accepted: 24 February 2017 / Published: 28 February 2017
(This article belongs to the Special Issue Structural Health Monitoring for Aerospace Applications 2017)
View Full-Text   |   Download PDF [3091 KB, uploaded 1 March 2017]   |  

Abstract

It has been shown that nonlinear ultrasonics can be more sensitive to local incipient defects, such as a fatigue crack, than conventional linear ultrasonics. Therefore, there is an increasing interest in utilizing nonlinear ultrasonics for structural health monitoring and nondestructive testing applications. While the conditions, which are the necessary conditions that should be satisfied for the generation of nonlinear harmonic components, are extensively studied for distributed material nonlinearity, little work has been done to understand the necessary conditions at the presence of a localized nonlinear source such as a fatigue crack. In this paper, the necessary conditions of nonlinear ultrasonic modulation generation in a plate-like structure are formulated specifically for a localized nonlinear source. Then, the correctness of the formulated necessary conditions is experimentally verified using ultrasounds obtained from aluminum plates. View Full-Text
Keywords: nonlinear ultrasonic modulation; fatigue crack detection; necessary conditions; localized nonlinearity; propagating waves; stationary vibrations nonlinear ultrasonic modulation; fatigue crack detection; necessary conditions; localized nonlinearity; propagating waves; stationary vibrations
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Lim, H.J.; Sohn, H. Necessary Conditions for Nonlinear Ultrasonic Modulation Generation Given a Localized Fatigue Crack in a Plate-Like Structure. Materials 2017, 10, 248.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top