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A Four Element Model for the Dynamic Response of a Ferrogel under Cyclic Magnetic Fields Yi Han Iowa State Universtiy of Science and Technology Department of Aerospace Engineering, Iowa State University, Ames, 50011-2271, US Phone: 515-294-0089, Email: yihan@iastate.edu Wei Hong Iowa State University, Ames, IA LeAnn Faidley Iowa State University, Ames, IA Sarah J Timmons Iowa State University, Ames, IA Abstract: Ferrogels are polymer materials embedded with magnetic powder that drives the deformation in a magnetic field. Some predominant properties of ferrogels, like large strain, fast response, high energy densities, make these materials suitable for various actuator and sensor applications. However, the dynamic behavior of ferrogels are not yet characterized and fully understood. A series of experiments of these materials under various frequencies was carried out to study their dynamic properties. Based on experimental observation, we have developed a phenomenological model that couples the magnetic field with the dynamic response of the material. A simple model constructed by two springs and two dashpots can captures the behaviors of dynamic strains of a ferrogel specimen under cyclic magnetic fields. The prediction of the frequency dependence of the response by this model has a reasonable agreement to the experimental result. Society of Engineering Science ▪ 47 th Annual Technical Meeting 198
Internal Fluctuation of DNA in Nanochannels Tianxiang Su University of Pennsylvania 229 Towne Building, 220 S. 33rd Street, Mechanical Engineering, University of Pennsylvania, Philadelphia, 19104, US Phone: 2158983870, Email: tsu@seas.upenn.edu Prashant K. Purohit University of Pennsylvania, Philadelphia, PA Abstract: Stretching DNA in nanochannels is an important technique for performing DNA mapping [1]. On the other hand, it also serves as a simplified model for studying single polymer behavior in concentrated polymeric solutions and melts [2]. For these reasons, mechanical behaviors of DNA inside nanochannels have been of great interest to both experimentalists and theorists in recent years. To date, scaling laws for the behaviors of confined DNA in both the de Gennes and Odijk regimes have been well developed, widely used and tested [3,4]. However, fluctuation of the internal segments inside the DNA is still not well understood. This is important for genome mapping because it is the local fluctuation that determines the resolution of the mapping. In this work, we study the internal fluctuation of confined DNA in nanochannels. We show that for a long DNA molecule whose contour length is much longer than its persistence length, the fluctuation versus mean value data collected from various locations along the polymer collapses onto a single curve with 0.5 power law. This can also be derived by a scaling theory. For short DNA, however, the scaling model fails and the data from different locations does not collapse onto a single curve. Following the framework in reference [5], a more detailed theory is developed. This theory models the DNA as a discrete wormlike chain in a confined channel. The confinement effects are taken into account by quadratic potentials and the internal fluctuation for the confined chain is evaluated. Further, by considering different boundary conditions, regions that are most affected by the boundary effects are identified. Surprisingly, not all the internal segments close to the boundaries are strongly influenced by the boundary conditions. Fluctuations of short internal segments, for example, are not significantly affected even though they are located close to the boundaries. The model for short DNA is further verified by Monte Carlo simulations. References: [1] Tegenfeldt, JO, Prinz C, Cao H, et al. Proceedings of the National Academy of Sciences, 2004, 101, 10979-10983. [2] Doi M, Edwards S. The Theory of Polymer Dynamics. Oxford University Press: Oxford, UK, 1986. [3] de Gennes PG. Scaling Concepts in Polymer Physic. Cornell University Press: Ithaca, NY, 1979. [4] Odijk T. Macromolecules, 1983, 16, 1340--1344. [5] Su T, Purohit PK. Journal of the Mechanics and Physics of Solids, 2010, 58:164-186. 199 ABSTRACTS
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Abstracts 1 ABSTRACTS
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Contents 4 Foreword 5 Welcome from
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Welcome From College of Engineering
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Roger Fosdick Department of Aerospa
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Invariants in Nonlinear Elasticity
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Coarse-Graining Atomistic Dynamics
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Fracture Behavior of Mechanophore-L
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Stability of periodic media under c
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Three Dimensional Compressible Mult
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Experimental and Modeling Study to
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Thermoresponsive Microcapsules for
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Shear Activation of Mechanophore-Li
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Room Temperature Healing of a Therm
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Collagen Fibrils: Multifunctional N
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Tianxiang Su Mechanical Engineering
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Understanding the Influence of Stra
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Thermodynamic Based Higher-Order Gr
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35 ABSTRACTS
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where is the heating rate. Derivati
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Oxidation and Hole Formation in Alu
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Effect of surface tension and energ
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A Computational Framework for Micro
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45 ABSTRACTS
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It has been suggested that air bubb
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Fig. 2. Melting temperature vs part
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Quantifying the Effect of Pulsatile
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Error analysis for 3-D shape measur
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To test the effects of the ultrasou
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Surface Coverage and Hybridization
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Track 1 Horner Symposia 59 ABSTRACT
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A 3D Pseudo-Elastic Model for Mulli
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Analytical Solutions for the Onset
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References [1] J. D. Humphrey. Nati
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Analysis of Stiffness Variations in
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Indentation of a Nonlinear Viscoela
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Linear Theory for the Bending and S
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Buckling and Finite Deformation of
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Remarks on the Infinitesimal Stabil
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finite characteristic dimensions, t
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On Mathematics in Ray Ogden's Contr
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Superposition of Finite-Amplitude S
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Stability of Electro Active Polymer
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Modelling of Electro-Viscoelasticit
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The Vibration Induced Dissipative H
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Arterial Modeling Considering the M
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A Two-Scale Collagen Turn-Over Mode
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Statistical Non-Linear Fibre-Reinfo
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A Model of Growth and Mass Transfer
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Reading the Mechanical Response of
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Fundamental Solution in Plane Aniso
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Simply Unreal: Grassmann Hypercompl
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Influence of Fiber Dissolution and
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On the electro-mechanical response
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On the Importance of Counterion Con
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Stewart Silling Sandia National Lab
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On the Modeling of Rheological Beha
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Acoustoelastic Measurement of Surfa
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Time permitting, we consider the Ta
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Effect of Nonlinearity on the Stead
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Is Step-Flow Epitaxy Ever Stable? M
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Entropy of a Constrained Hamiltonia
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The Volume Derivative and Fracture
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The Anomalous Behavior of Material
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Energy Release Rate of Dielectric M
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SYMPOSIUM 2-2 Cell Mechanics ORGANI
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study to show the highly three-dime
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Chemomechanics at the Cell-material
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Interplay between Cell and Matrix S
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A Coarse-Grain Molecular Dynamics M
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Contact Mechanics of Circular Membr
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Fibroblast Elongation, Dendritic Ex
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Applying Controlled Loads to Single
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An Overview of Vibro-Acoustography
Page 147 and 148: Fracture between Molecules Kenneth
Page 149 and 150: Investigation of Skull Hemorrhage a
Page 151 and 152: Uncovering Morphological and Morpho
Page 153 and 154: Microcantilever Based Aptameric Nan
Page 155 and 156: Fluid-Structure Interaction Models
Page 157 and 158: Anaylzing Range of Motion in Total
Page 159 and 160: Direct Measurement of Plastic Dissi
Page 161 and 162: The Influence of Screw Thread and T
Page 163 and 164: Static Evaluation of Shear Loading
Page 165 and 166: during 5000 test cycles, load drop
Page 167 and 168: Nanomechanics of Tropocollagen and
Page 169 and 170: Hip Implant Interfacial Motion, a F
Page 171 and 172: Mapping Tibial Surface Strains usin
Page 173 and 174: Bone Isotropy Characterization Unde
Page 175 and 176: Effects of Anthropometric Geometry
Page 177 and 178: On Stress Theory for Fractal Bodies
Page 179 and 180: The Kinetic Relation as a Pivotal P
Page 181 and 182: Creasing Instability in Soft Matter
Page 183 and 184: Inverse Stress Analysis in AAA Cons
Page 185 and 186: Experimental and Modeling Study to
Page 187 and 188: Material Analysis for the Developme
Page 189 and 190: Experimentally Verified Approach fo
Page 191 and 192: A Long-Pulse Kolsky Bar Technique f
Page 193 and 194: Active Porous Scaffolds for Control
Page 195 and 196: Sensor Behavior of Magneto-Rheologi
Page 197: Slipping Plane Plasticity using the
Page 201 and 202: Carmel Majidi Harvard University, S
Page 203 and 204: Coupling of Localized Buckling Defo
Page 205 and 206: An Energy-Based Approach to Capture
Page 207 and 208: A Theory of Actuation of Ionic Poly
Page 209 and 210: Three-Dimensional Imaging of Crysta
Page 211 and 212: In-situ Reconstruction of Tip-sampl
Page 213 and 214: TRACK 3 Fluid Mechanics 213 ABSTRAC
Page 215 and 216: Alan Wineman Comments on the Career
Page 217 and 218: Numerical Solutions in Nonlinear Ma
Page 219 and 220: Mathematical Modeling of a New Clas
Page 221 and 222: Mixture Theory to Study Blood Flow
Page 223 and 224: Phase Field Theory for Phase Transf
Page 225 and 226: Nonlocal Gradient-Dependent Constit
Page 227 and 228: On Unsteady Non-homogenous Flows of
Page 229 and 230: Fluid Dynamics of the Deepwater Hor
Page 231 and 232: SYMPOSIUM 3-2 Dynamics and Rheology
Page 233 and 234: Modeling and Homogenization of Bact
Page 235 and 236: Dynamics of a Semi-flexible Polar F
Page 237 and 238: Dense Cellular Blood Flow in a Mode
Page 239 and 240: Drag, Diffusive Motion, and Mixing
Page 241 and 242: SYMPOSIUM 3-3 Experimental Fluid Me
Page 243 and 244: Population, Characteristics and Kin
Page 245 and 246: The Effect of Particle Concentratio
Page 247 and 248: A Hybrid Simulation of Continuum an
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An Experimental Study of Pulsed Mic
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SYMPOSIUM 3-5 Fluid Issues in Renew
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Influence of Cylinder Aspect Ratio
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Numerical Investigation of Aerodyna
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SYMPOSIUM 3-8 Multiphase Flow ORGAN
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Three Dimensional Compressible Mult
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Numerical Simulation of Gust Respon
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SYMPOSIUM 4-1 Nanomechanics: Beyond
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Nano Adhesion and Indentation Kenne
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Atomistic Mechanisms of Cyclic Hard
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Broadband Nanoindentation Spectrosc
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Importance of AFM Beam Dynamics for
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Quantitatively Exploring the Mechan
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Effect of Scales and high Temperatu
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Experimental and Model Developments
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Controlled Carbon Nanotube Junction
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Understanding the Influence of Stra
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Temperature and Strain Rate Sensiti
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The Influence of Chemical Substitut
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Non-Uniqueness in Energy Minimizati
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Coarse-Graining Atomistic Dynamics
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simulations will also be discussed,
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Dislocation Cores in Elastically An
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SYMPOSIUM 4-3 Strain Rate Effects i
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Dynamic-Tensile-Extrusion in Low Im
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Wave Profile Shaping for Shock-Tube
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SYMPOSIUM 4-4 Size Scale Effects in
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Atomistic and Continuum Understandi
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Physical Interpretation and Experim
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Tensile Ductility and Plasticity Me
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A New Nonlocal Shell Model for Axis
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Effect of Surface Roughness and Fun
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An Analysis of the Effects of Surfa
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A SEM Image-based Finite Element Ap
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SYMPOSIUM 4-5 Phase Transformations
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Modeling and Simulation of Strain-i
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Nanovoid Nucleation Inside Elastopl
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Molecular Dynamics Study of Thermal
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Effect of Surface Tension and Energ
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A bi-crystal Aggregate Model of Mar
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SYMPOSIUM 4-6 Multifunctional Compo
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Electrified Carbon Fiber Polymer Ma
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Thermal and Mechanical Properties o
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Carbon Nanotube Buckypaper Material
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Effective Parameters of Bucky Gel M
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Influence of Surface Roughness and
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Microvascular Networks for Thermal
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Henghua Jin University of Illinois
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A High Temperature Cured Structural
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Autonomic Structural Cooling via Ad
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Pressurized Vascular Systems for He
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Photovoltaic Waveguide Polymer Comp
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Effect of Silane Coupling Agent on
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Crushing Behavior of Composite Hexa
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Degradation Kinetics of Aerospace W
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Multiscale Modeling of Micro/nano S
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[1] Y.A. HUANG, Z. YIN, A. TESFAMIC
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Quantitative Nondestructive Evaluat
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A Multiscale Model of Rate Dependen
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Localization Analysis of Porous Met
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Negative Stiffness and Negative Poi
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Failure Surfaces for Fiber-Reinforc
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Nonlocal Boundary Layer Method for
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An Exact Solution for History-Depen
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Development of an Internal State Va
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A Study of Highly Crosslinked Epoxy
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Convergence and Scaling in Peridyna
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Graphene Fracture Kyug-Suk Kim Brow
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A Computational Framework for Micro
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Measurement of Mechanical Propertie
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The Role of Electrons in Nanostruct
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Thermoresponsive Microcapsules for
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Elastic Softening of Amorphous and
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Autonomic Restoration of Conductivi
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Response of Composite Structures to
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Lateral Vibration of a Travelling T
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Shear Activation of Mechanophore-Li
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Cooling Effects on the Vibronic Ban
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Dynamoic Damage Tolerance of Aerona
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SYMPOSIUM 4-13 Laser and Multi-Ener
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Ab initio Simulation of Photo-disso
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Laser Texturing of Polyimide for Al
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Surface Modification of Titanium Vi
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Coating Deposition via Insertion of
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Laser Resonant Vibrational Excitati
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Femtosecond Laser Fabrication of Ne
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Multi-fluid Model of Early-stage Fe
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Track 6 Nondestructive Evaluation o
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Developments in Testing and Health
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High Volume, Remote Sensing, Non-in
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Development and Application of Magn
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A Performance Measure for Ceramic A
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Probing Acoustic Nonlinearity using
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Ultrasonics of Periodic Structures
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Nanoscale Interfacial Probing of Ru
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Laser Ultrasonic Thermometry for In
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Physics-based Analysis of Infrared
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Acoustic Characteristics Measuremen
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