Title

Piezospectroscopic Coatings: Effects Of Alumina Nanoparticle Volume Fraction On Stress-Sensing

Abstract

Coatings with embedded photo-luminescent alumina nanoparticles as “sensors” have shown potential for detecting signs of damage within the underlying substrates. Chromium-doped alumina is naturally photo-luminescent with spectral properties that are characterized by two distinct peaks known as R-lines. When the material is subjected to stress, shifts in the R-lines occur, which is known as the piezospectroscopic effect. Recent work has shown that improved sensitivity of the technique can be achieved through a configuration of nanoparticles within a polymer matrix, which can be applied to a structure as a stress-sensing coating. This study demonstrates the capability of piezospectroscopic coatings in mechanical tests and investigates the effect of nanoparticle volume fraction on sensing performance. Here, we show measurements of spectral shifts that capture variation in stress of the coating during a mechanical test and in the region of substrate damage. The results show the ability to design and tailor the “sensing” capability of these nanoparticles and correlate the measured stress variations with the presence of stress and damage in underlying structures. This study is relevant to nondestructive evaluation in the aerospace industry, where monitoring signs of damage is of significance for testing of new materials, quality control in manufacturing and inspections during maintenance.

Publication Date

1-1-2018

Publication Title

International SAMPE Technical Conference

Volume

2018-May

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

85050404035 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85050404035

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