Engineering Approach for the Evaluation of Mechanical Wear Considering the Experimental Holloman High-Speed Test Track
Publication: Journal of Engineering Mechanics
Volume 138, Issue 9
Abstract
This research is directed toward an understanding of the high-speed interaction effects that two bodies have on each other. The experimental high-speed test track at Holloman AFB has undergone many design innovations over 50 years. One of the problems that remains in the modern era related to improving the speed characteristics of a rocket test sled is the wear that the interconnecting device, called the slipper, undergoes as it slides down the rail and impacts local asperities. The research is separated into two main areas. The first is the metallurgical investigation in which the material change is brought about by the surface friction through surface collision, and characteristics are determined that lead to a numerical model. The second is the development of a finite-element model using the commercial code ABAQUS, which is used in an attempt to capture the physics involved in the overall phenomenon. It became evident that the wear is not uniform, but is dictated by the evolving aerodynamics of a sled moving at close to 1,500 m/s, the speed considered in this research, creating an uneven wear surface at the interface of the slipper and rail. The finite-element analysis is separated into two models, one related to the global effects of movement using a predefined velocity versus time function, and the other defining a microlocal collision with a surface asperity. The Johnson-Cook flow equation is used to establish a von Mises maximum stress failure criterion within ABAQUS to arrive at the results. A method has been developed that allows the prediction of wear for a time-dependent forcing function obtained through a structural dynamics approach. Results indicate that the method is sufficiently robust that the physics of the wear process at high speeds is reasonably modeled. The metallurgical investigation is accomplished by testing component parts of a slipper recovered after a January 2008 sled test run, and this is used as the evidence of wear.
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Acknowledgments
The writers would like to acknowledge the Air Force Office of Scientific Research for financially supporting this research. Additionally, Dr. Michael Hooser and his associates at the HHSTT made critical contributions to this research effort. The Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson AFB, Ohio, provided invaluable expertise and support during the metallographic analysis. The views expressed in this work are those of the authors and do not reflect the official policy or position of the United States Air Force, the Department of Defense, or the U.S. Government. This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 138 • Issue 9 • September 2012
Pages: 1127 - 1140
Copyright
© 2012. American Society of Civil Engineers.
History
Received: May 5, 2011
Accepted: Feb 9, 2012
Published online: Feb 11, 2012
Published in print: Sep 1, 2012
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