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Title page for ETD etd-04092007-150941


Type of Document Dissertation
Author Sengupta, Sreeparna
Author's Email Address sreeparnasg@gmail.com
URN etd-04092007-150941
Title Interfacial Design and Mechanics Analysis of Advanced Materials and Structures
Degree PhD
Department Civil Engineering
Advisory Committee
Advisor Name Title
Roy Xu Committee Chair
Carol Rubin Committee Member
Prodyot K Basu Committee Member
Sankaran Mahadevan Committee Member
Keywords
  • Interfacial Mechanics
  • Monte Carlo simulation
  • Nanotechnology
  • Fracture mechanics
Date of Defense 2007-04-06
Availability unrestricted
Abstract
Many natural and technological processes involve phenomena dominated by interfacial mechanics – occurring within the overlapping region between several solid/fluid phases. Interfacial phenomena typically involve interplay of complex processes and the exact mechanics involving such processes is still not fully understood. As advanced materials and structures are being investigated to better optimize weight, cost and strength, it is imperative that material interfaces be better characterized in terms of their properties, thereby increasing reliability in usage.

Reliability can be increased either by building better structures or by manufacturing better materials. In this light, a method has been investigated to remove stress singularity at bi-material corners and thereafter applied to explain the reduction in the tensile strength of bonded interfaces after the incorporation of graphitic carbon nanofibers in the epoxy matrix. This approach is expected to produce more reliable material strength data. Simultaneously, in the context of a different bi-material problem (thin film-substrate), the fracture mechanics approach was utilized to propose a novel method for measurement of interfacial fracture toughness. In the final part of the study, the influence of non-uniform stress distributions at material interfaces was investigated to understand interfacial failure in brittle materials.

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