Multifunctional MENs doped adhesives for bond quality evaluation

Ping Wang, Daniela Gil, Mauricio Pajon, Brian Hernandez, Uliette Dubon, Benjamin Boesl, Sakhrat Khizroev, Bassim Arkook, Dwayne McDaniel

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

Abstract

Adhesive bonding for composite structures offers multiple advantages over traditional fasteners such as reducing the weight, creating a more uniformly distributed stress state in the joint, and elimination of stress concentration factors due to joining. However, the strength of adhesive bonds can be reduced due to environmental exposure, contamination, mechanical damage and fatigue and assurances of long-Term durability and bond strength are not available. Before adhesive bonding of composites can be used on primary structures, a method for guaranteeing the bonds strength must be developed. Due to magneto-electric principles, magneto-electric nanoparticles (MENs) can be used to detect minute changes of electric fields at the molecular level through detectable changes of the nanoparticles' magnetization. As a result, when integrated into epoxy based adhesives, MENs are capable of detecting chemical or mechanical induced material imperfections at the molecular level. Current efforts are focused on developing a field tool that can be used to obtain magnetic signatures from doped adhesives similar to those obtained via laboratory scale equipment (vibrating sample magnetometer). To achieve similar sensitivities, FIU is investigating the use of a B-H looper system. In this approach, the MENs material is probed with a specifically designed setup that includes small electric coils wrapped around the sample. The coils are arranged into a noisecancellation configuration to measure the magnetic susceptibility of the sample under various conditions with a lock-in amplifier. With the goal to identify signature response characteristics of specific environmental and mechanical effects, various epoxy based adhesive samples were doped with 30 nm diameter MENs. Differences in magnetic signatures were observed between environmentally aged samples and baseline samples, demonstrating the viability of the B-H looper system as a bond inspection tool.

Original languageEnglish (US)
Title of host publication33rd Technical Conference of the American Society for Composites 2018
PublisherDEStech Publications Inc.
Pages2499-2507
Number of pages9
ISBN (Electronic)9781510872073
StatePublished - 2018
Event33rd Technical Conference of the American Society for Composites 2018 - Seattle, United States
Duration: Sep 24 2018Sep 27 2018

Publication series

Name33rd Technical Conference of the American Society for Composites 2018
Volume4

Conference

Conference33rd Technical Conference of the American Society for Composites 2018
Country/TerritoryUnited States
CitySeattle
Period9/24/189/27/18

ASJC Scopus subject areas

  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Metals and Alloys

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