In situ damage precursor detection in fiber reinforced composites using anthracene-based mechanophore

Bonsung Koo, Jack Miller, Ryan Gunckel, Asha Hall, Lenore Dai, Aditi Chattopadhyay

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

A pioneering approach to in situ damage precursor detection in fiber reinforced polymer composites is developed using anthracene-based stress-sensitive mechanophore material. In this research, the anthracene-based mechanophore, which emits ultraviolet (UV) excited fluorescence on chemical bond breakage under the influence of external mechanical loads, is effectually used as a nanoscale damage sensor. Dimeric 9-anthracene carboxylic acid (Di-AC) is synthesized and incorporated into glass fiber reinforced polymer (GFRP) composites through a hand layup process. A quasi-static uniaxial tensile load is applied to the specimens, and UV excited fluorescence from the activated Di-AC mechanophore during the tensile loading tests is captured through UV camera. The results indicate that the activation of Di-AC starts at a very early stage in the tests (≈0.33% strain for single-ply and ≈0.5% strain for three-ply laminate specimens) and exhibits a linear increase prior to failure (≈1.6% strain for single-ply and ≈2.28% strain for three-ply laminate specimens). Nonlinear optical response is captured when the specimen is close to failure. The mechanophore response to interlaminar damage is also investigated using composite specimens with induced delamination. The potential of anthracene-based mechanophore for early damage detection as well as barely visible damage detection in GFRP is successfully demonstrated.

Original languageEnglish (US)
Article number115035
JournalSmart Materials and Structures
Volume28
Issue number11
DOIs
StatePublished - Oct 16 2019
Externally publishedYes

Keywords

  • damage precursor
  • dimeric anthracene
  • glass fiber reinforced polymer composites
  • mechanophore
  • thermoset

ASJC Scopus subject areas

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

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