Effect of load and temperature changes on nonlinear ultrasonic Measurements: Implications for SHM

Vamshi Krishna Chillara, Hwanjeong Cho, Mostafa Hasanian, Cliff J. Lissenden

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Advances in ultrasonic guided waves make it possible to combine the penetration power of guided waves with the early damage detection capabilities of nonlinear ultrasound to interrogate a fairly large area. However, there is a need to re-examine the definition of the relative nonlinearity parameter in the context of SHM. It is known that the definition of the relative nonlinearity parameter relies on the amplitudes of the fundamental and higher harmonic modes and a change in any of these can affect the relative nonlinearity parameter. For SHM methodologies incorporating nonlinear ultrasound, factors such as transducer operating conditions and environmental effects come into play and may affect the nonlinearity parameter even without significant microstructural changes in the material being interrogated. To bridge this gap, the current study aims to investigate the effect of load and temperature changes on guided wave third harmonic generation from shear horizontal (SH) waves in aluminum plates. SH waves were excited using magnetostrictive transducers and third harmonic measurements were made under increasing static-tensile loads at constant temperature and increasing temperature under no load. The results obtained, along with the implications for SHM incorporating nonlinear ultrasound are discussed.

Original languageEnglish (US)
Title of host publicationStructural Health Monitoring 2015
Subtitle of host publicationSystem Reliability for Verification and Implementation - Proceedings of the 10th International Workshop on Structural Health Monitoring, IWSHM 2015
EditorsFu-Kuo Chang, Fotis Kopsaftopoulos
PublisherDEStech Publications
Pages783-790
Number of pages8
ISBN (Electronic)9781605951119
DOIs
StatePublished - Jan 1 2015
Event10th International Workshop on Structural Health Monitoring: System Reliability for Verification and Implementation, IWSHM 2015 - Stanford, United States
Duration: Sep 1 2015Sep 3 2015

Publication series

NameStructural Health Monitoring 2015: System Reliability for Verification and Implementation - Proceedings of the 10th International Workshop on Structural Health Monitoring, IWSHM 2015
Volume2

Other

Other10th International Workshop on Structural Health Monitoring: System Reliability for Verification and Implementation, IWSHM 2015
CountryUnited States
CityStanford
Period9/1/159/3/15

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Health Information Management

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