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 Keywords
- Epoxy compounds Thermal properties
- Fiber reinforced plastics Thermal properties
Date of Defense 1992-08-05 Availability restricted AbstractThe 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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