Title

Low Strain Rate In Situ Piezospectroscopic Studies Of Alumina Nanocomposites

Abstract

In situ photo-stimulated luminescence measurements of low strain rate experiments provide stress-sensitive information using the piezospectroscopic (PS) behavior of alumina nanoparticles embedded in an epoxy matrix. For these quasi-static tests, cylindrical specimens were fabricated using a casting process to ensure minimal surface finishing and reduced manufacturing time. In addition to the strengthening benefits of nano-sized modifiers, the results illustrate the capability of alumina nanoparticles as a diagnostic mechanism to measure the stress-induced shifts of the spectral R-line peaks resulting from low compressive strain rates. Results showed an increase in sensitivity of the PS coefficients with increasing strain rate when compared to similar materials under static conditions. This information can be used to determine the time-dependent micro-scale stresses the nanoparticles sustain during composite yielding and failure. Additionally, this work facilitates failure prediction by monitoring upshifts in PS information and calibrates the in situ diagnostic stress sensing abilities of 20% volume fraction alumina nanocomposites under quasi-static strain rates of 10-4, 10-3, and 10 -2 s-1. Copyright 2013 by Aurora Flight Sciences.

Publication Date

8-12-2013

Publication Title

International SAMPE Technical Conference

Number of Pages

2149-2158

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84881138720 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84881138720

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