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A composite is generally defined as a material composed of two or more separate sub-materials that complement each other's characteristics when combined. Composites are widely used in several major industries due to their low density, high strength, and relatively predictable chemical and electrical properties. One of the significant challenges of integrating composites into more diverse fields is the ability to accurately and consistently test for damages. Due to the myriad number of microscopic structures available in composite materials, a single-use testing system is a large contributor to current research. One approach to the non-destructive testing of composites lies in exploiting the dielectric properties of the material. Using a strong electric field, the molecules in the constituent materials of both damaged and non-damaged samples can be polarized and examined for differences. Broadband Dielectric Spectroscopy (BbDS) is one method to measure the dielectric properties such as conductivity, resistivity, impedance, and permittivity. This paper observes how permittivity changes in quasi-isotropic Glass Fiber Reinforced Polymer (GFRP) specimens over a broad frequency spectrum. In addition to BbDS, Thermally Stimulated Depolarized current (TSDC) is used to vary the electric field to understand the relaxation of the polarized material over a temperature gradient. The overall objective is to obtain a relationship between various damage levels and dielectric properties using BbDS and TSDC that can help to identify damage sites in composites and assess the level of accrued damages in the material as a whole. [Copyright 2021. Used by CAMX - The Composites and Advanced Materials Expo. CAMX Conference Proceedings. Dallas, TX, October 19-21, 2021. CAMX – The Composites and Advanced Materials Expo.]


Engineering | Materials Science and Engineering

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Available for download on Wednesday, January 01, 3000