Magnetostrictive composites for wireless stress sensing applications

Alex Yoffe, Doron Shilo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This article presents a theoretical and experimental study of the relationships between the stress, strain, and magnetic field emitted from epoxy-based Terfenol-D composite materials that are intended for stress sensing applications. The experimental results were analyzed and simulated by a new model that accounts for the inherent hysteretic and non-linear mechanical behavior of the epoxy. The results reveal a critical strain above which the perfect bonding between the Terfenol-D and the epoxy does not valid. This critical strain is very close to the transition strain, at which non-180° domain switching is finished and the magnetization rotation becomes the dominant process in the Terfenol-D. Comparisons between simulations and experimental results, obtained at strains smaller than the critical strain, revealed that most of the hysteresis in the magnetic field versus stress curves is derived from the inherent hysteresis in the stress-strain behavior of the epoxy. These results encourage the search for a more suitable epoxy that provides better bonding with Terfenol-D and smaller hysteresis. Despite the drawbacks of the currently used epoxy, both measured and simulated curves showed that for strain amplitudes smaller than the critical strain, the magnetic field vs. stress curve is approximately linear and has a minor amount of hysteresis, making the sensor suitable for stress-sensing applications.

Original languageEnglish
Title of host publication9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019
EditorsAyech Benjeddou, Nazih Mechbal, Jean-Francois Deu
PublisherInternational Center for Numerical Methods in Engineering
Pages1414-1426
Number of pages13
ISBN (Electronic)9788494919466
StatePublished - 2019
Event9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019 - Paris, France
Duration: 8 Jul 201911 Jul 2019

Publication series

Name9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019

Conference

Conference9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019
Country/TerritoryFrance
CityParis
Period8/07/1911/07/19

Keywords

  • Magnetostrictive materials
  • Smart composites
  • Stress sensing
  • Terfenol-D

All Science Journal Classification (ASJC) codes

  • General Energy
  • Pollution
  • General Materials Science

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