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    Communications Project


Document Type:Master's Thesis
Name:David Fred McBagonluri-Nuuri
Email address:dmcbagon@vt.edu
URN:1998/00946
Title:Simulation of Fatigue Performance & Creep Rupture of Glass-Reinforced Polymeric Composites for Infrastructure Applications
Degree:Master of Science
Department:Engineering Science & Mechanics
Committee Chair: John J. Lesko
Chair's email:jlesko@vt.edu
Committee Members:Scott Case
David Gao
David Dillard
Keywords:Glass Composites, Fatigue, Environmental Effects, Lattice Green˙s Function, Creep Rupture, Fiber Bundle, Local Load Sharing
Date of defense:August 18, 1998
Availability:Release the entire work immediately worldwide.

Abstract:

A simulation model which incorporates the statistical- and numerical-based Lattice Green Function Local Load Sharing Model and a Fracture Mechanics-based Residual Strength Model has been developed. The model simulates creep rupture by imposing a fixed load of constant stress on the composite over the simulation duration. Simulation of the fatigue of glass fiber-reinforced composites is achieved by replacing the constant stress parameter in the model with a sinusoidal wave function. Results from the creep rupture model using fused silica fiber parameters, compare well with S-2 glass/epoxy systems. Results using Mandell’s postulate that fatigue failure in glass fiber-reinforced polymeric composites is a fiber-dominated mechanism, with a characteristic slope of 10 %UTS/decade are consistent with available experimental data. The slopes of fatigue curves for simulated composites for three frequencies namely: 2, 5 and 10 Hz are within 12-14 %UTS/decade compared with that of 10.6-13.0%UTS/decade for unidirectionl glass reinforced composites (epoxy and vinyl ester) obtained from Demers’ [40] data.

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Thesis.pdf


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