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You searched on: Author: timothy quinn

Displaying records 11 to 20 of 23 records.
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11. A Multi-Phasic Continuum Damage Mechanics Model of Mechanically Induced Increased Permeability in Tissues
Published: 12/30/2005
Authors: Brian O'Neill, Timothy P Quinn, Victor F. Frankel, King C. Li
Abstract: Recently, we have reported enhanced permeability of tissues due to in vivo treatment with pulsed high intensity focused ultrasound (pHIFU). This new therapy has shown promise as a way of increasing the penetration of large drug molecules both out of ...

12. Dynamic Factors Contributing to Buckling and Birdnesting During GMAW Wire Feeding
Published: 6/1/2005
Authors: Toby Padilla, Timothy P Quinn, D. R. Munoz, R. A. Rorrer, John R. Berger
Abstract: This study provides experimental data for determining the factors affecting wire feeding performance. Full-scale experiments show that feeding performance, in terms of wire feed speed and wire feeding force, varies with the material system and with t ...

13. A Coupled Arc and Droplet Model of GMAW
Published: 1/8/2005
Authors: Timothy P Quinn, M Szanto, T Gilad, I Shai
Abstract: A model of gas metal arc welding was developed that solves the magneto-hydrodynamic equations for the flow and temperature fields of the molten electrode and the plasma simultaneously, to form a fully coupled model. A commercial finite element code ...

14. Constitutive Models for a Poly(e-caprolactone) Scaffold
Published: 10/1/2004
Authors: Timothy P Quinn, Tammy L. Oreskovic, Christopher N McCowan, N Washburn
Abstract: We investigate material models for a porous, polymeric scaffold used for bone. The material was made by co-extruding poly (e-caprolactone) (PCL), a biodegradable polyester, and poly(ethylene oxide)(PEO). The water soluble PEO was removed resulting in ...

15. A Mathematical Model of Wire Feeding Mechanisms in GMAW
Published: 7/1/2003
Authors: T M Padilla, D. R. Munoz, Timothy P Quinn, R. A. Rorrer
Abstract: A Hertzian based contact model of the friction between the welding wire and the wire liner has been developed to predict the wire pulling force for gas metal arc welding (GMAW). The model predicts a 2.5:1exponential increase in wire pulling force as ...

16. GMAW Wire Feedability: A Friction Model
Published: 7/1/2003
Authors: A Padilla, D. R. Munoz, Timothy P Quinn, R. A. Rorrer
Abstract: A Hertzian-based contact model of the friction between the welding wire and the wire liner has been developed to predict the wire pulling force for gas metal arc welding (GMAW). The model predicts a 2.5:1 exponential increase inwire pulling force as ...

17. An Experimental Method for Measuring Mechanical Properties of Rat Pulmonary Arteries Verified With Latex
Series: Journal of Research (NIST JRES)
Published: 6/1/2003
Authors: Elizabeth S Drexler, Andrew J Slifka, J Wright, Christopher N McCowan, Dudley Finch, Timothy P Quinn, J D McCloskey, Dunbar Ivy, Robin Shandas
Abstract: A study of the biomechanics and hemodynamics of pulmonary hypertension is incomplete without including mechanical properties data comparing healthy and diseased arterial tissue. In the initial stabe of this study, Sprague-Dawley rats will be induced ...

18. XML for Exchange of Weld Inspection Results
Published: 4/1/2003
Authors: William G Rippey, Timothy P Quinn, John L Michaloski
Abstract: TECHNICAL SUMMARYIntroduction/Background SectionA system to demonstrate the transfer of weld inspection data between computer programs is described in this paper. The goal is effortless flow of the data between multi-vendor welding software applicat ...

19. Process Sensitivity of GMAW: Aluminum vs. Steel
Published: 4/1/2002
Author: Timothy P Quinn
Abstract: A heat-transfer model of the melting electrode in gas metal are welding (GMAW) was used to compare the relative sensitivity of the process when welding with aluminum electrodes compared to that of steel electrodes. The aluminum model was verified wi ...

20. Contact Tube Temperature During GMAW
Published: 12/1/2001
Authors: G Adam, Thomas A. (Thomas A.) Siewert, Timothy P Quinn, D P Vigliotti
Abstract: The rate of heating and the maximum temperature reached by the contact tube during gas metal arc welding (GMAW) is quantified. We studied the effect of changes in the contact-tube-to-work distance (CTWD), voltage, welding wire feed speed, gas flow r ...

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