Prof. Jonghwan Suhr Profile

Prof. Jonghwan Suhr

Assistant Professor at Univ of Delaware

SPIE Involvement:

Author

Proceedings Article | 22 June 2016 Presentation

Property modification of Nafion via polymer blending with ethylene vinyl alcohol "polyimide" (Conference Presentation)

Taeseon Hwang, Jungsoo Nam, Qi Shen, Sarah Trabia, Jonghwan Suhr, Dong-Chan Lee, Kwang Jin Kim

Proceedings Volume 9798, 979820 (2016) https://doi.org/10.1117/12.2220448

KEYWORDS: Polymers, Actuators, Lanthanum, Ion exchange, Composites, Platinum, Electrodes, Resistance, Electroactive polymers, Current controlled current source

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Proceedings Article | 30 April 2012 Paper

Toughening mechanisms of thermoplastic particulate polycarbonate composites

Hyung-ick Kim, Wenjie Zhao, Jonghwan Suhr

Proceedings Volume 8342, 83420T (2012) https://doi.org/10.1117/12.914984

KEYWORDS: Composites, Polymers, Acoustics, Particles, Acoustic emission, Atmospheric particles, Thulium, Scanning electron microscopy, Neodymium, Atmospheric modeling

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Proceedings Article | 28 March 2012 Paper

Determination of local debonding stress and investigation of its effect on mechanical properties of glass short fiber reinforced polycarbonate composites

Wenjie Zhao, Hyung-ick Kim, Jonghwan Suhr

Proceedings Volume 8342, 83421Z (2012) https://doi.org/10.1117/12.915448

KEYWORDS: Composites, Glasses, Polymers, Interfaces, Acoustic emission, Finite element methods, Particles, Thermal modeling, Fiber reinforced polymers, Absorption

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Proceedings Article | 28 March 2012 Paper

Vibration and wave number characterization in carbon-fiber sandwich composite structures

J. Sargianis, J. Suhr

Proceedings Volume 8342, 83421S (2012) https://doi.org/10.1117/12.915024

KEYWORDS: Acoustics, Composites, Carbon, Foam, Epoxies, Wave propagation, Wind energy, Manufacturing, Statistical analysis, Mechanics

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Proceedings Article | 28 March 2012 Paper

Characterization of particle diameter and interphase effects on Young's modulus of SiO2/epoxy particulate composites

Jae-Soon Jang, Ronald Gibson, Jonghwan Suhr

Proceedings Volume 8342, 83420A (2012) https://doi.org/10.1117/12.915209

KEYWORDS: Particles, Composites, Silica, Nanocomposites, Epoxies, Finite element methods, Nanolithography, Scanning electron microscopy, Data modeling, Mechanical engineering

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Proceedings Article | 28 March 2012 Paper

Mechanical properties of continuously reinforced MWCNT polymer composites in compression

Yupeng Li, Jonghwan Suhr

Proceedings Volume 8342, 83420V (2012) https://doi.org/10.1117/12.915018

KEYWORDS: Composites, Polymers, Carbon nanotubes, Autoregressive models, Neodymium, Molybdenum, Ruthenium, Mechanical engineering, Foam, Mechanics

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Proceedings Article | 28 April 2011 Paper

Strain dependent visco-elastic response of CNFs' reinforced epoxy composites

Joshua Varischetti, Jae-Soon Jang, Jonghwan Suhr

Proceedings Volume 7978, 79780Q (2011) https://doi.org/10.1117/12.885033

KEYWORDS: Composites, Nanostructuring, Epoxies, Finite element methods, 3D modeling, Carbon, Nanocomposites, Interfaces, Performance modeling, Data modeling

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Recent advances in the production and availability of nanoscale materials has led to a significant interest in the use of nanoscale fillers in order to augment and tailor material performance in nanostructured composites. A specific area of interest is the use of high aspect ratio fillers, such as carbon nanotubes (CNT) and carbon nanofibers (CNF) to augment the damping capacity of nanostructured composites. Previous work has shown the use of high aspect ratio fillers to significantly enhance the damping capacity at low frequency by more than 100%; however, the enhancement achieved has been predicated on strain levels in the composite. Our previous studies have indicated a strong strain dependent response in the nanostructured composites utilizing CNF to augment damping capacity. This is due, in part, to the random distribution of fiber orientations seen in the nanostructured composites. The random distribution of filler orientations is thereby relative to the load applied to the composite that results in a critical shear stress thresholds being surpassed at the nano scale, allowing the filler to slip relative to the matrix, resulting in frictional energy dissipation as heat and thereby inducing damping to the high aspect ratio filler nanostructured composite. In light of the promise this technology holds for use in engineered applications requiring specific damping performance, there remains a fundamental lack in understanding of the precise mechanisms and thereby a lack of ability to accurately predict material performance, which is limiting application of the technology. This study looks at the effect of the random filler orientation of CNF included composites and examines the viscoelastic response of the composite specifically investigating the effect of filler orientation relative to the loading direction and the effect of filler waviness. Furthermore, this study looks at the strain dependent nature of the viscoelastic response and develops an analytical modeling tool to look at the effect of the strain dependent viscoelastic response seen in previous studies with the aim of achieving a better fundamental understanding of the effect of filler orientation and the associated strain dependent nature of the viscoelastic response seen in high aspect ratio nano- filled composites.

Proceedings Article | 28 April 2011 Paper

Spherically shaped micron-size particle-reinforced PMMA and PC composites for improving energy absorption capability

Hyung-ick Kim, Eung-Chun Kang, Jae-Soon Jang, Jonghwan Suhr

Proceedings Volume 7978, 79780U (2011) https://doi.org/10.1117/12.885037

KEYWORDS: Composites, Polymethylmethacrylate, Particles, Polymers, Absorption, Resistance, Neodymium, Phase modulation, Scanning electron microscopy, Photoacoustic tomography

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Proceedings Article | 1 April 2009 Paper

Energy absorbing hybrid nano-composite materials

Jae-Soon Jang, Joshua Varischetti, Gyo Woo Lee, Jonghwan Suhr

Proceedings Volume 7289, 72891A (2009) https://doi.org/10.1117/12.815801

KEYWORDS: Silica, Composites, Epoxies, Particles, Temperature metrology, Polymers, Nanocomposites, Carbon, Glasses, Mechanical engineering

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Proceedings Article | 2 April 2008 Paper

Fatigue characteristics of carbon nanotube blocks under compression

J. Suhr, L. Ci, P. Victor, P. Ajayan

Proceedings Volume 6929, 69290Q (2008) https://doi.org/10.1117/12.775943

KEYWORDS: Carbon nanotubes, Tissues, Structural engineering, Resistance, Scanning electron microscopy, Image compression, Mechanical engineering, Artificial muscles, Composites, Mechanics

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Proceedings Article | 15 March 2006 Paper

Preventing interfacial slip in carbon nanotube polycarbonate composites

Jonghwan Suhr, Nikhil Koratkar

Proceedings Volume 6169, 616912 (2006) https://doi.org/10.1117/12.658618

KEYWORDS: Composites, Single walled carbon nanotubes, Nanocomposites, Interfaces, Carbon nanotubes, Polymers, Scanning electron microscopy, Structural engineering, Mechanical engineering, Nanolithography

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Proceedings Article | 16 May 2005 Paper

Characterization of mechanical properties of multiwalled nanotube polymer composites

Jonghwan Suhr, Linda Schadler, Nikhil Koratkar

Proceedings Volume 5760, (2005) https://doi.org/10.1117/12.594567

KEYWORDS: Polymers, Nanocomposites, Composites, Carbon nanotubes, Interfaces, Scanning electron microscopy, Carbon, Nanolithography, Data storage, Aerospace engineering

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