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Title page for ETD etd-12012010-152033


Type of Document Dissertation
Author Krishnan, Arun
Author's Email Address arun.krishnan@vanderbilt.edu
URN etd-12012010-152033
Title The Interfacial Failure of Bonded Materials and Composites
Degree PhD
Department Civil Engineering
Advisory Committee
Advisor Name Title
Prof. Caglar Oskay Committee Chair
Prof. Carol Rubin Committee Member
Prof. L. Roy Xu Committee Member
Prof. P.K. Basu Committee Member
Prof. Sankaran Mahadevan Committee Member
Keywords
  • Mixed-mode Fracture
  • Compression-after-impact
  • Mode-II fracture toughness
  • Interfacial failure
  • composites
  • Multiscale Homogenization
  • Glass/Vinyl Ester composite
Date of Defense 2010-11-19
Availability unrestricted
Abstract
Composites and adhesive joints are being increasingly used in modern structures.

It becomes very important to characterize the failure in such materials especially at the

interface between constituents. This dissertation is focused on interfacial failure in

composites and bonded polymers. A short-beam shear fracture approach is developed to

measure the mode-II fracture toughness of materials with a preferred interface. This

method is more efficient than previous methods due to minimal friction between crack

faces. A novel failure criterion proposed by Leguillon (2002) is used to predict crack

initiation from notches. This dissertation advances the scope of this criterion to predict

failure from notches with a connected interface. Same- and bi-material systems are tested

under three-point bending to provide relevant data for verification which is also expected

to be a benchmark for future numerical simulations. Finally, the compression-after-impact

(CAI) of glass/vinyl ester composites subject to sea water aging is investigated

experimentally. A reduced order multiscale computational model is used to explain the

damage mechanisms in the composite and to capture the experimental degradation in CAI

strength.

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