Title page for ETD etd-72198-155929


Type of Document Master's Thesis
Author McBagonluri-Nuuri, David Fred
Author's Email Address dmcbagon@vt.edu
URN etd-72198-155929
Title Simulation of Fatigue Performance & Creep Rupture of Glass-Reinforced Polymeric Composites for Infrastructure Applications
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Lesko, John J. Committee Chair
Case, Scott W. Committee Member
Dillard, David A. Committee Member
Gao, David Y. Committee Member
Keywords
  • Glass Composites
  • Fatigue
  • Environmental Effects
  • Lattice Green's Function
  • Creep Rupture
  • Fiber Bundle
  • Local Load Sharing
Date of Defense 1998-08-18
Availability unrestricted
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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