Title page for ETD etd-12302008-063746

Type of Document Master's Thesis
Author Jones, Wendy Michele
URN etd-12302008-063746
Title An investigation of the interfacial characteristics of nitinol fibers in a thermoset composite
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Rogers, Craig A. Committee Chair
Knight, Charles Eugene Committee Member
West, Robert L. Jr. Committee Member
  • Shape memory effect
Date of Defense 1991-10-05
Availability restricted
A heightened interest in intelligent material systems has occurred in recent years due to their remarkable adaptive abilities. Intelligent materials systems, which contain sensors and actuators coupled by means of active control, frequently utilize composite materials as the skeletal structure. In order for composite materials to be utilized in intelligent material systems to their utmost capability, many material properties, including the interfacial shear strength between the embedded sensor or actuator and the matrix must be thoroughly understood..

Investigations were performed in order to examine the effects of different variables on the interfacial characteristics between a nitinol fiber and a composite matrix. First, rough, clean fiber surfaces were found to provide the best adhesion to the matrix due to the mechanical interaction of the matrix with the rough surface finish. Second, it was determined that the interfacial shear strength is not dependent upon embedded fiber length. Third, a very small diameter fiber will break before pulling out of the matrix, but overall, large fibers have a greater interfacial strength. Fourth, it was found that the initial prestrain on the fiber during processing had no effect on the interfacial shear strength of the fiber to the matrix. Fifth, it was determined that fatigue does not degrade the shear strength of any of the different initial pres trains. Finally, it was found that a coating that does not adhere well to the fiber neither macroscopically degrades nor enhances interfacial strength.

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