Document Type
Thesis
Degree
Master of Science (MS)
Major/Program
Materials Science and Engineering
First Advisor's Name
Benjamin Boesl
First Advisor's Committee Title
Committee Chair
Second Advisor's Name
Dwayne McDaniel
Second Advisor's Committee Title
Committee Member
Third Advisor's Name
Sakhrat Khizroev
Third Advisor's Committee Title
Committee Member
Keywords
Composites, Adhesive, MENs, Nanoparticles, Carbon Fiber, Epoxy, Mechanical Testing, Structural Health Monitoring
Date of Defense
3-31-2016
Abstract
Composites are in high demand; however, fasteners are often required for joining process and can reduce their advantages. One solution is adhesive bonding, but uncertainty exists regarding long term durability and the ability to interrogate bonds noninvasively. One potential solution to qualify bond integrity over its service life is to dope an adhesive with magneto-electric nanoparticles (MENs). MENs can yield output magnetic signatures that are influenced by bond quality and damage state. In this study, adhesives have been doped with MENs prior to bonding at 1% volume concentration. For optimum implementation, this health monitoring system should be evaluated for effects of the MENs on the mechanical properties. Lap-shear testing was conducted to assess changes in the bond strength from addition of the nanoparticles. End-notched flexure (ENF) tests were also conducted for fracture mechanism evaluation. Results showed an increase of 12% in shear strength as a function of MENs loading concentration. In addition, a feasibility study of output magnetic signature as a function of elevated temperature and humidity were evaluated for MENs doped and un-doped adhesives. Results gave an order of magnitude change in magnetic signal as a function of exposure time.
Identifier
FIDC000238
Recommended Citation
Yang, Kao Z., "MENs Doped Adhesive and Influence on Fracture Toughness" (2016). FIU Electronic Theses and Dissertations. 2487.
https://digitalcommons.fiu.edu/etd/2487
Included in
Aerospace Engineering Commons, Aviation Commons, Electrical and Computer Engineering Commons, Materials Science and Engineering Commons, Mechanical Engineering Commons
Rights Statement
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).