A5023104980- Rheology and Fluid Dynamics Studies
- Composite Material Mechanics
- Innovations in Concrete and Construction Materials
- Fluid Dynamics and Turbulent Flows
- Polymer Foaming and Composites
- Polymer crystallization and properties
- Injection Molding Process and Properties
- Lattice Boltzmann Simulation Studies
- Computational Fluid Dynamics and Aerodynamics
- Advanced Numerical Methods in Computational Mathematics
- Material Dynamics and Properties
- Mechanical Behavior of Composites
- Elasticity and Material Modeling
- Nanofluid Flow and Heat Transfer
- Epoxy Resin Curing Processes
- Model Reduction and Neural Networks
- Numerical methods in engineering
- Granular flow and fluidized beds
- Blood properties and coagulation
- Vibration and Dynamic Analysis
- Force Microscopy Techniques and Applications
- Parallel Computing and Optimization Techniques
- Fluid Dynamics and Vibration Analysis
- Optical measurement and interference techniques
- Textile materials and evaluations
Virginia Tech
2009-2020
University of Delaware
2005
UCLouvain
1998-2001
Swansea University
1998-1999
University of Wales
1998-1999
Technical University of Denmark
1999
Japan External Trade Organization
1998
Delft University of Technology
1995-1998
From the thermodynamics with internal variables we will derive temperature equation for viscoelastic fluids. We consider type of storage mechanical energy, dissipation compressibility fluid, nonequilibrium heat capacity and thermal expansion, deformation induced anisotropy conduction. The well-known stress differential models that fit into thermodynamic theory be treated as an example. Adapting a power-law scaling shear moduli on density, is usual in rubber elasticity, approximation...
Fiber suspension theory model parameters for use in the simulation of fiber orientation complex flows are, general, either calculated from or fit to experimentally determined generated processing flows. Transient stress growth measurements startup shear flow and reversal rate range, γ̇=1–10 s−1, were performed on a commercially available short glass fiber-filled polybutylene terephthalate using novel "donut-shaped" sample cone-and-plate geometry. Predictions Folgar–Tucker orientation, with...
Abstract The properties of long glass fiber reinforced parts are highly dependent on the orientation generated during processing. In this research, concentrated fibers filling stage a center‐gated disk (CGD) mold was simulated. calculated using both Folgar‐Tucker model and recently developed semiflexible Bead‐Rod model. Rheologically consistent parameters were used in these simulations, as determined from previously proposed method, sliding plate rheometer newly modified stress theory....
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Kevin Ortman, Donald Baird, Peter Wapperom, Abby Whittington; Using startup of steady shear flow in a sliding plate rheometer to determine material parameters for the purpose predicting long fiber orientation. J. Rheol. 1 July 2012; 56 (4): 955–981. https://doi.org/10.1122/1.4717496 Download citation file: Ris...
Summary A complete sample preparation procedure used to determine three‐dimensional fiber orientation from optical micrographs of glass fiber‐reinforced thermoplastic composites is presented. Considerations for elimination irregularities in the elliptical footprints, contrast enhancement between fibers and surrounding polymer matrix, controlled‐etching that allows identification small shadows where recedes into topographical reconstruction footprint are described procedure. This has produced...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Mark J. Cieslinski, Donald G. Baird, Peter Wapperom; Obtaining repeatable initial fiber orientation for the transient rheology of suspensions in simple shear flow. Rheol. 1 January 2016; 60 (1): 161–174. https://doi.org/10.1122/1.4938229 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends...
See also related Letter to the Editor: A note added "Prediction of rheometrical and complex flows entangled linear polymers using double-convection-reptation model with chain stretching" [J. Rheol. 47, 247 (2003)]
The conventional method for obtaining transient rheological data on short glass fiber-filled polymeric fluids is to use the parallel disk (PP) geometry in a rotational rheometer. Using PP large stress overshoot behavior was observed during startup of flow measurements 30 wt % polybutylene terephthalate. A contributing factor this believed be induced fiber collisions caused by inhomogeneous velocity field (radial varying gradient). novel approach taken which “donut” shaped sample used...
Abstract Delay in fiber orientation evolution based on the Folgar-Tucker model with a slip parameter correction has been proposed as simple alternative to improve predictions of injection molded parts. Predictions this and parameters fitted data from shear experiments were compared experimentally determined center-gated disk. Three methods fitting assessed obtain isotropic diffusivity parameter. The evaluated at entry, lubrication near-end-of fill regions disk for 30 wt.% short glass...