Program Organizers: Dr.Robert A.Schiffman, R.S. Research Inc., Barton, VT 05822; Professor Carlo Patuelli, Universita di Bologna, I-40126 Bologna, Italy
Tuesday, PM Room: Orange County 2
February 6, 1996 Location: Anaheim Marriott Hotel
Session Chairperson: Professor Carlo Patuelli, Universita di Bologna, I-40126 Bologna, Italy
2:00 pm
OVERVIEW AND PRELIMINARY MODELING AND GROUND-BASED RESULTS FOR THE OLiPSE EXPERIMENT: E. Atchley, T. Hamilton, A. Hedayat, J.E. Smith, Jr., The Department of Chemical and Materials Engineering, The University of Alabama in Huntsville, Huntsville, AL 35899
The Optizone Liquid Phase Sintering Experiment (OLiPSE) will begin on STS-67 studying samples of Fe, Co, Ni, Ni-W cemented with either Ag or Cu under vacuum. Eight ampoules, four from the Ag and Cu systems, each containing 10 samples, will be transported aboard STS-67 and processed as a function of time in the Russian Optizone furnace aboard space station MIR. Video tape recordings of the melt and solidification process will be available during the LPS process using this unique piece of Russian flight hardware. After processing, the samples will be returned on the next available space shuttle for metallurgical analysis. Thermal modeling of the multi-sample ampoule that installs into the Russian Optizone furnace have been accomplished. The results of this modeling will be compared to measurements of the thermal profiles and power consumption of the ground based Optizone furnace. Specific details about the mission, its scientific objectives, numerical modeling results and an overview of the Optizone furnace and its ground performance will be presented.
2:20 pm
NUMERICAL SIMULATION OF DIRECTIONAL SOLIDIFICATION OF HYPERMONOTECTIC ALLOYS WITH RESIDUAL GRAVITY: Y. Arikawa, J.B. Andrews, Department of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294; S.R. Coriell, W.F. Mitchell, B.T. Murray, National Institute of Standards and Technology, Gaithersburg, MD 20899
In this study, a numerical simulation scheme is under development for simplified hypermonotectic alloy solidification. The simulation is based on a mathematical model following an analysis for eutectic systems. However, supplemental effects including high diffusivity in one of the product phases and Marangoni effects at the interface are considered as well. The interface shape has been calculated. Also, the level of residual gravity and g-jitter which cause the disruption of the interface solute layer have been investigated utilizing a popular fluid dynamics package. Results agree with analytical estimations.
2:40 pm
STATISTICAL DESIGN OF EXPERIMENTS - A POWERFUL AND ESSENTIAL TOOL FOR MICROGRAVITY MATERIALS RESEARCH: S. Varma, S.E. Prasad, Sensor Technology Limited, B.M. Hi-Tech Div., P.O. Box 97, Collingwood, Ontario, Canada L9Y 3Z4. A. Ahmad, T.A. Wheat, MTL/CANMET, Natural Resources Canada, 405 Rochester Street, Ottawa, Ontario, Canada K1A 0G1
The progress in microgravity materials processing research has generally been slow and limited due to the lack of flight opportunities, the number of parameters that can influence the processes, and high associated costs for microgravity and extensive ground based experiments. Selection of optimum conditions of microgravity experiments, which could clearly show the effect of gravity on the studied response, are necessary but not easy to obtain in multi-component materials whose properties may be simultaneously affected by a number of process parameters. Statistical design of experiments is a powerful, and in our opinion an essential, tool for microgravity materials research as it has the capability of systematically screening a number of process parameters simultaneously, and then mapping the effect of most important process parameters to select the optimum conditions for microgravity materials processing experiments. Examples of a number of statistical designs used for the ground-based and microgravity experiments, including those to be used for heavy metal fluoride glass processing experiments on the Russian MIR space station in 1996, are presented to demonstrate the effectiveness of this approach.
3:00 pm
A NOVEL EXPERIMANT TECHNIQUE TO STUDY THE DIFFERENT PHENOMENA AT A FREE LIQUID METAL SURFACE: A. Bojarevics, Yu. Gelfgat: Institute of Physics, Riga, Latvia, Gunter gerbeth, A. Cramer, Research Center Rossendorf, Inc., P.O. Box 510119, 01314 Dresden, Germany
3:20 pm
DEVELOPMENT OF A UNIVERSITY BASED LOCAL TELEOPERATIONS SITE FOR THE PERFORMANCE OF EXPERIMENTS IN MICROGRAVITY: M. B. Koss, M.E. Glicksman, L.T. Bushnell, J.C. LaCombe, Materials Science and Engineering Department, Rensselaer Polytechnic Institute, Troy, NY 12180-3590; E.A. Winsa, NASA Lewis Research Center, Cleveland, OH 44135
The Isothermal Dendritic Growth Experiment (IDGE), a NASA space flight experiment, was designed to provide microgravity and ground-based data on dendritic growth velocities and radii of curvature for a critical test of theory. A key element in the operation of this experiment during its first flight aboard the United States Microgravity Payload (USMP-2) on STS-62 in March 1994 was its use of telescience for the near-real-time monitoring and control of the experiment. For the IDGE's second flight (USMP-3), scheduled for February 1996 on STS-75, a remote operations and control center will be established at Rensselaer Polytechnic Institute. This local site, using a subset of the data and communication systems available at the Payload Operations and Control Center (POCC) at the Marshall Space Flight Center (MSFC), will provide a proof of concept for local teleoperational facilities. In this paper, we describe the telescience capabilities of the Rensselaer Operations and Control Center (ROCC), how we plan to use these capabilities, and how this approach to space flight experimentation might be relevant to the development of remote operations sites for Space Station operations and experiments.
3:40 pm
QUELD II - A MULTIPURPOSE EXPERIMENTAL FACILITY FOR THE SPACE STATION ALPHA: Reginald Smith, Mark Gallerneault, Kevin Best, Queen's University, Kingston, Canada K7L 3N6; Timothy Smith, Sydney Pugh, Millenium Biologix, Kingston, Canada K7M 7G3
In October 1992, the Space Shuttle Columbia took into orbit Canadian Astronaut Steve McLean and the CANEX 2 mid-deck payload. One of the facilities was QUELD (Queen's University Experiment in Liquid Diffusion). Throughout the flight, the crew repeatedly processed liquid metal diffusion couples and subsequently brought back to Earth some very interesting diffusion data. In view of the success obtained with the manually operated QUELD unit, the Canadian Space Agency is sponsoring the design and construction of an automated version which is to be placed in the PRIRODA facility soon to be attached to MIR as part of the build-up to ALPHA. Whilst on ALPHA, QUELD II will process a variety of specimens including metallic and non-metallic diffusion couples, infra-red glasses, ternary compound semiconductors and a number of phase-ripening systems. The experimental facility and the associated research activity will be described.
4:00 pm
SHUTTLE AND MIR MICROGRAVITY ENVIRONMENT: K. Hrovat, M.J.B. Rogers, Tal-Cut Company, 3355 Richmond Road, Suite 251A, Beachwood, OH 44122; R. Hakimzadeh, R. DeLombard, NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, OH 44135
The Microgravity Measurement and Analysis Project at NASA Lewis Research
Center is tasked with characterizing the microgravity environment of the
Shuttle missions on which science experiments are conducted. The on-going work
accomplished by this group includes measurement of the microgravity
acceleration environment on-board the NASA Orbiters, the Russian MIR space
station and, eventually, the International Space Station. This paper will
describe the overall microgravity environment ranging in frequency from 100
Hertz down to quasi-steady. The microgravity environment is generated by
multiple sources and is dependent on the location within the vehicle. As such,
the microgravity environment at one location is highly complex but unique. This
paper will also describe specific examples of major disturbances along with
samples of the acceleration environment for those disturbances. Examples of
quiet and "noisy" times on the Orbiter and MIR will also be illustrated.
Knowledge of the expected microgravity environment will assist scientists in
properly preparing their experiment and/or experiment sample for the expected
accelerations to be encountered during their operation. Information necessary
to obtain microgravity environmental data will also be presented.
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