Title
Mode I Delamination Fracture Characterization of Polymeric Composites under Elevated Temperature
Date of Award
2011
Degree Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Mechanical and Aerospace Engineering
Advisor(s)
Barry D. Davidson
Keywords
Delamination
Subject Categories
Engineering
Abstract
Delamination is one of the major failure modes seen in the laminated polymeric matrix composite (PMC). Accurate prediction of delamination initiation and propagation is important for the design and analysis of robust composite structures. Existing experimental methodologies that are based on linear elastic fracture mechanics are inadequate to characterize delamination fracture properties under elevated temperature when PMC properties become time-, loading-history, and rate-dependent. A new experimental methodology based on linear viscoelastic fracture theory is developed and verified through finite element analysis and experiments. This new technique determines crack growth curves, such as stress intensity factor vs. crack growth speed and fracture initiation energy vs. crack initiation time, through the experimentally determined J-integral, Js, for a linear viscoelastic double cantilever beam (DCB) specimen. Special test setup is designed and validated for determining accurate Js using just the applied load and the load end rotation angles. This new methodology is then applied to measure the mode I fracture properties of a highly toughened graphite/epoxy composite under various environmental conditions.
Access
Open Access
Recommended Citation
Zhao, Wenming, "Mode I Delamination Fracture Characterization of Polymeric Composites under Elevated Temperature" (2011). Mechanical and Aerospace Engineering - Dissertations. 59.
https://surface.syr.edu/mae_etd/59
