Title page for ETD etd-05162006-191640


Type of Document Master's Thesis
Author Abada, Christopher H.
Author's Email Address cabada@vt.edu
URN etd-05162006-191640
Title The Influence of Reinforcement Architecture on the Fracture Behavior of Selectively Reinforced Materials
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Hyer, Michael W. Committee Chair
Dowling, Norman E. Committee Member
Farley, Gary L. Committee Member
Singh, Mahendra P. Committee Member
Keywords
  • Crack Tip Opening Angle
  • Selective Reinforcement
  • Crack Propagation
Date of Defense 2006-05-12
Availability unrestricted
Abstract
A computer-based parametric study of the effect of reinforcement architectures on fracture response of aluminum compact-tension (CT) specimens was performed using the finite element code ABAQUS. A three-dimensional crack propagation procedure based on the crack tip opening angle (CTOA) was developed using Python. Eleven different reinforcement architectures consisting of rectangular and triangular cross-section reinforcements were evaluated. Reinforced specimens produced between 13 and 28 percent higher fracture load than achieved with the non-reinforced case. Reinforcements with blunt leading edges (rectangular reinforcements) exhibited superior performance relative to the triangular reinforcements with sharp leading edges. Relative to the rectangular reinforcements, the most important architectural feature was reinforcement thickness. At failure, the reinforcements carried between 58 and 85 percent of the load applied to the specimen, suggesting that there is considerable load transfer between the base material and the reinforcement. The amount of load transfer is linked to strains experienced by the reinforcement ahead of the crack tip.
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