MENs Doped Adhesive and Influence on Fracture Toughness

Yang, Kao Z

doi:10.25148/etd.fidc000238

Cited by 2 publications

(1 citation statement)

References 26 publications

(27 reference statements)

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“…There is a well-known mechanism for nanoparticle reinforcing agents to change properties of polymers, however, there is no known mechanism of crack propagation. MENs specifically, in single-lap shear tests, have shown to increase the shear strength of an adhesive by 24% with the addition of small volume concentrations of MENs [56]. Along with strengthening of the adhesive, the MENs could serve as a tool for structural health monitoring.…”

Section: Magneto-electric Nanoparticlesmentioning

confidence: 99%

Development of Novel, Microscale Fracture Toughness Testing for Adhesives

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I would like to acknowledge and sincerely thank all who contributed to the work presented in this thesis. I would like to specifically acknowledge Dr. Benjamin Boesl for his guidance, support, and advice during my academic career here at FIU. Dr. Boesl introduced me to research as an undergraduate and allowed me to continue research while pursuing M.S. in mechanical engineering. He provided me with an in depth understanding and passion for research and academia. Additionally, I would like to specifically thank Dr. Dwayne McDaniel who provided countless amounts of support and guidance. I hope everyone gets an opportunity to have amazing mentors like Dr. Boesl and Dr. McDaniel. I would also I would also like to acknowledge and thank Dr. Sakhrat Khizroev who provided important support and knowledge for this thesis. I would like to thank all my peers that made my research career here at FIU enjoyable and friends that kept me from going mad; Jorge Coria, Kao Yang, Anthony Abrahao, and any others I may have missed. I would like to thank everyone at the Applied Research Center for their help and friendship. Finally, I would like to thank the Office of Naval Research and William Nickerson for the funding for this project (ONR FA8650-13-C-5800). v

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Section: Magneto-electric Nanoparticlesmentioning

confidence: 99%

Development of Novel, Microscale Fracture Toughness Testing for Adhesives

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Multifunctional MEN-Doped Adhesives: Strengthening, Bond Quality Evaluation, and Variations in Magnetic Signal with Environmental Exposure

et al. 2022

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Adhesive bonding of polymer matrix composites offers various advantages over traditional fasteners, such as a uniform stress state, reduced weight, and delay of composite delamination. However, adhesive bonding has limited implementation due to challenges in the prediction of durability. This work introduces a new method to monitor an adhesively bonded composite joint by dispersing magneto-electric nanoparticles (MENs) into the polymer precursor and monitoring changes in their surface charge density by evaluating the output magnetic signal under an applied magnetic field. Real-time monitoring of the curing process of a polymer adhesive was performed and corroborated via thermal analysis and mechanical testing. Lap shear and end notch flexure testing showed that adding 1 vol% MENs led to a ~23% increase in shear strength and a ~12% increase in mode II critical energy release rates compared to the undoped adhesive. Adding 5 vol% MENs also increased the adhesive’s peak tensile stress by ~8%. Strengthening mechanisms of the doped adhesive were monitored using in situ electron microscopy. A correlation between water ingression and a change in the magnetic moment was observed. Results show the MENs’ potential as a structural health-monitoring tool for a wide range of materials and applications.

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MENs Doped Adhesive and Influence on Fracture Toughness

Cited by 2 publications

References 26 publications

Development of Novel, Microscale Fracture Toughness Testing for Adhesives

Development of Novel, Microscale Fracture Toughness Testing for Adhesives

Multifunctional MEN-Doped Adhesives: Strengthening, Bond Quality Evaluation, and Variations in Magnetic Signal with Environmental Exposure

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