Feasibility of a new nonlinear ultrasonic technique for monitoring damage in composite plates

H. Alnuaimi, U. Amjad, P. Russo, V. Lopresto, T. Kundu

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

Abstract

In this paper, the feasibility of a relatively new nonlinear ultrasonic technique called sideband peak count (SPC) is investigated for monitoring progressive damage in composite plate specimens. Lead Zirconate Titanate or PZT transducers are used to generate guided ultrasonic waves in composite specimens. Multiple sets of composite plate specimens are fabricated, damaged and inspected using PZT transducers. While fabricating the composite specimens thermoplastic resins are used because of its increasing popularity in various fields. While introducing damage in the plate specimens by impact special attention is given to the understanding of the failure mechanisms of composite materials under low velocity impacts due to the occurrence of invisible damages. The difficulty in the prediction of the initiation and propagation of failure modes in composite laminates comes from the fact that the specimens are not transparent and hence inner damage evaluation is not possible from simple visual inspections. Being able to 'see' the internal damages is a basic requirement for understanding the failure mechanisms. Different failure mechanisms, such as fiber breaks, matrix cracking, debonding and delamination are observed for composite materials. The setup for the experimental impact tests is capable of both traditional in air and non-traditional in water impacts. For a comparative investigation, the composite samples are divided into two groups - glass fiber composites and basalt fiber composites. They are damaged by impactors striking the specimens with different levels of impact energy. A chirp signal is excited and propagated through undamaged and damaged specimens in a single sided excitation/detection setup to investigate the effects of varying degrees of damage on the recorded signals. Processing of the recorded signals for damage analysis involved both linear and nonlinear analyses. Linear ultrasonic parameters, such as the change in the time-of-flight of the propagating waves, Fast Fourier Transform and S-Transform of the recorded signals are studied while the Sideband Peak Count or the SPC analysis is carried out as part of the nonlinear ultrasonic analysis.

Original languageEnglish (US)
Title of host publicationStructural Health Monitoring 2019
Subtitle of host publicationEnabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring
EditorsFu-Kuo Chang, Alfredo Guemes, Fotis Kopsaftopoulos
PublisherDEStech Publications Inc.
Pages2231-2238
Number of pages8
ISBN (Electronic)9781605956015
StatePublished - Jan 1 2019
Event12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019 - Stanford, United States
Duration: Sep 10 2019Sep 12 2019

Publication series

NameStructural Health Monitoring 2019: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring
Volume2

Conference

Conference12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019
CountryUnited States
CityStanford
Period9/10/199/12/19

    Fingerprint

ASJC Scopus subject areas

  • Computer Science Applications
  • Health Information Management

Cite this

Alnuaimi, H., Amjad, U., Russo, P., Lopresto, V., & Kundu, T. (2019). Feasibility of a new nonlinear ultrasonic technique for monitoring damage in composite plates. In F-K. Chang, A. Guemes, & F. Kopsaftopoulos (Eds.), Structural Health Monitoring 2019: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring (pp. 2231-2238). (Structural Health Monitoring 2019: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring; Vol. 2). DEStech Publications Inc..