Publications by Type: Conference Paper

P. C. de Blanc, Brown, C. L., McKinney, D. C., Speitel Jr, G. E., and Pope, G. A., “Surfactant Flushing and Bioremediation - Striking a Balance,” in In Situ and On-Site Bioremediation, Columbus, OH, 1997, vol. 2, pp. 565-574.
J. M. Symons, Xia, R., Diehl, A. C., Speitel Jr, G. E., Hwang, C. J., Krasner, S. W., and Barrett, S. E., “The Influence of Operational Variables on the Formation of Dissolved Organic Halogen During Chloramination,” in Water Disinfection and Natural Organic Matter: Characterization and Control, ACS Symposium Series 649, Washington, DC, 1996, pp. 78-104.
P. C. de Blanc, McKinney, D. C., and Speitel Jr, G. E., “Modeling Subsurface Biodegradation of Non-Aqueous Phase Liquids,” in Advances in Porous Media, Amsterdam, The Netherlands, 1996, vol. 3, pp. 1-82.
C. Lee and Machemehl, R. B., “Multiobjective Optimization of Equilibrium Network Signal Setting and Pricing,” in Transportation Research Forum, 38th Annual Meeting, Volume 2., 1996.Abstract
S. C. Otis and Machemehl, R. B., “Predicting pedestrian safety at suburban signalized intersections,” in Compendium of Technical Papers for the 66th ITE Annual Meeting, 1996.Abstract
C. C. Kou and Machemehl, R. B., “Super Street Long Term Improvement Schemes and Capacity Analysis: A Case Study,” in Transportation Research Forum, 38th Annual Meeting, Volume 2, 1996.Abstract
E. M. Taleff, Henshall, G. A., Lesuer, D. R., Nieh, T. G., and Wadsworth, J., “Enhanced Ductility of Coarse-Grain Al-Mg Alloys,” in Superplasticity and Superplastic Forming, 1995, pp. 3–10. LinkAbstract
Enhanced ductilities,i.e., values of tensile ductility exceeding those normally expected in metallic alloys, have been observed at warm temperatures in coarse-grained Al-Mg alloys which exhibit viscous-glide controlled creep. Numerous tests have been conducted in order to quantify this phe-nomenon over wide ranges of temperature and magnesium concentration. The contributions of strain-rate sensitivity and strain hardening have been analyzed in relation to the observed tensile ductilities. It is shown that an analysis based only on flow instability in tension cannot be used to predict failure in a unique manner.
E. M. Taleff, Henshall, G. A., Lesuer, D. R., Nieh, T. G., and Wadsworth, J., “Enhanced Tensile Ductility in Al-Mg Alloys by Solid-Solution Interactions,” in Aluminum and Magnesium for Automotive Applications, Warrendale, PA, 1995, pp. 125–134. LinkAbstract
The development of methods for obtaining high tensile elongation in aluminum alloys is of great importance for the practical forming of near-net-shape parts. Current superplastic alloys are limited in use by high material costs. The utilization of solute-drag creep processes, the approach used in this study, to obtain enhanced tensile ductility in aluminum alloys has lead to tensile elongations of up to 325% in simple, binary Al-Mg alloys with coarse grain sizes. This method has the advantage of lowering processing costs in comparison with superplastic alloys because a fine grain size is not necessary. Whereas superplastic alloys typically have a strain-rate sensitivity of m = 0.5, the enhanced ductility Al-Mg alloys typically exhibit m = 0.3 where maximum ductility is observed. Although a strain-rate sensitivity of rn = 0.5 can lead to elongations of over 1000% (superplastic materials) a value of m = 0.3 is shown experimentally to be sufficient for obtaining elongations of 150% to a maximum observed of 325%. Enhanced ductility is also affected strongly by ternary alloying additions, such as Mn, for which a preliminary understanding is pursued.
J. Wadsworth, Henshall, G. A., Nieh, T. G., and Taleff, E. M., “Materials Issues in Some Advanced Forming Techniques, Including Superplasticity,” in Emerging Technologies, 1995, pp. 87–94. LinkAbstract
From mechanics and macroscopic viewpoints, the sensitivity of the flow stress of a material to the strain rate, i.e. the strain rate sensitivity (m), governs the development of neck formation and therefore has a strong influence on the tensile ductility and hence formability of materials. Values of strain rate sensitivity range from unity, for the case of Newtonian viscous materials, to less than 0.1 for some dispersion strengthened alloys. Intermediate values of m = 0.5 are associated with classical superplastic materials which contain very fine grain sizes following specialized processing. An overview is given of the influence of strain rate sensitivity on tensile ductility and of the various materials groups that can exhibit high values of strain rate sensitivity. Recent examples of enhanced formability (or extended tensile ductility) in specific regimes between m = 1 and m = 0.3 are described, and potential areas for commercial exploitation are noted. These examples include: internal stress superplasticity, superplastic ceramics, superplastic intermetallics, superplastic laminated composites, superplastic behavior over six orders of magnitude of strain rate in a range of aluminum-based alloys and composites, and enhanced ductility in Al-Mg alloys that require no special processing for microstructural development.
S. C. Otis, Machemehl, R. B., and Mahmassani, H. S., “PREDICTING PEDESTRIAN VOLUMES BASED UPON LAND USE: A METHODOLOGY,” in Fifth National Conference on Transportation Planning Methods Applications-Volume I: A Compendium of Papers Based on a Conference Held in Seattle, Washington in April 1995, 1995.Abstract
E. M. Taleff, Henshall, G. A., Lesuer, D. R., and Nieh, T. G., “Warm Formability of Aluminum-Magnesium Alloys,” in Aluminum Alloys: Their Physical Properties and Mechanical Properties (ICAA4), Atlanta, Georgia: Georgia Institute of Technology, 1994, pp. 338–345.Abstract
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