Title page for ETD etd-02262007-095957

Type of Document Dissertation
Author Jayaraman, Krishnan
URN etd-02262007-095957
Title Effect of the interphase on the thermo-mechanical response of unidirectional fiber-reinforced epoxies : modeling, analyses and experiments
Degree PhD
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Reifsnider, Kenneth L. Committee Chair
Cramer, Mark S. Committee Member
Dillard, David A. Committee Member
Henneke, Edmund G. II Committee Member
Reffy, Junuthula N. Committee Member
Smith, Charles W. Committee Member
  • Epoxy compounds Thermal properties
  • Fiber reinforced plastics Thermal properties
Date of Defense 1992-08-05
Availability restricted
The complexity of the fiber-matrix interphase in a composite is largely due to the myriad of variables (material, processing, and design) that affect its formation. The interphase, thus formed, has to be characterized at several levels (micro-structural, chemical, and mechanical) in order for one to fully understand the nature of the bond between the fiber and matrix and in order to perform a stress analysis of the fiber-interphase-matrix assemblage.

A thorough thermo-mechanical characterization of the interphase is difficult, at present, due to the necessity of studying the interphase in situ, its small dimension (usually on the order of a micrometer), and its general complexity. However, a cursory glance at the literature shows that great progress has been made in all of the three levels of characterization mentioned above for various composite systems. Several recent attempts have focused on the physical characterization (evaluation of volume fraction, thickness, Young's modulus, shear modulus and coefficient of thermal expansion) of the interphase.

Models of physical properties (thickness, Young's modulus, Poisson's ratio and coefficient of thermal expansion) of the interphase have been considered by several researchers in an effort to study the influence of the interphase on overall composite properties and behavior. Hypotheses on interphase formation and properties have been proposed and tested by some researchers. Both experimental characterization as well as modeling studies are necessary to achieve a more profound understanding of the interphase and its behavior.

The interphase, in a composite, is usually modeled as a homogeneous region, despite the fact that it may have spatial property variations.

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