Damage state assessment of fiber reinforced metal laminate composites

R. Carmi, B. Wisner, P. A. Vanniamparambil, R. Shneck, A. Bussiba, A. Kontsos

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

Abstract

Fiber Reinforced Metal Laminate (FRML) composites are widely used as a structural material, mainly in the aerospace industry. One of the main challenges using FRML composites is to detect and asses/quantify damage during in-service conditions. For these reasons, the research presented in this article targets the development of a nondestructive testing and evaluation (NDT&E) method capable to assess damage development in FMRL composites as a function of applied loading. Specifically, the current research presents an approach based on multiscale observations which aims to monitor major failure modes in Glare®1A FRML specimens subjected to quasi-static loading conditions. Specifically, a combination of NDT&E methods is used including the Acoustic Emission (AE) and Digital Image Correlation (DIC) which are coupled with in situ Scanning Electron Microscope (SEM) level tensile tests. The post-processing of the ensemble of recorded AE activity reveals characteristics that were associated with the composite's constituents (Al-alloy as well as glass fibers within an epoxy matrix) along with features that were associated with delaminations and fiber/matrix interface failure. Furthermore, pronounced AE activity was detected at the elastic to plastic transition region which was found to evolve in a way similar to micro-crack density trends suggested by micro-mechanical models. The similarity noticed, motivated the use of specific AE features to evaluate the damage state evolution in FRML composites.

Original languageEnglish
Title of host publicationECCM 2018 - 18th European Conference on Composite Materials
PublisherApplied Mechanics Laboratory
ISBN (Electronic)9781510896932
StatePublished - 1 Jan 2020
Event18th European Conference on Composite Materials, ECCM 2018 - Athens, Greece
Duration: 24 Jun 201828 Jun 2018

Publication series

NameECCM 2018 - 18th European Conference on Composite Materials

Conference

Conference18th European Conference on Composite Materials, ECCM 2018
Country/TerritoryGreece
CityAthens
Period24/06/1828/06/18

Keywords

  • Acoustic Emission
  • FRML
  • Glare
  • Mechanical properties

ASJC Scopus subject areas

  • Ceramics and Composites

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