Documents disponibles écrits par cet auteur

Engineering approach for the evaluation of mechanical wear considering the experimental holloman high - speed test track / Chad S. Hale in Journal of engineering mechanics, Vol. 138 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1127–1140. Titre : Engineering approach for the evaluation of mechanical wear considering the experimental holloman high - speed test track Type de document : texte imprimé Auteurs : Chad S. Hale, Auteur ; Anthony N. Palazotto, Auteur ; William P. Baker, Auteur Année de publication : 2012 Article en page(s) : pp.1127–1140. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Holloman  High  Speed  Test  Track  (HHSTT)  High  velocity  wear  rate  VascoMax  300  maraging  steel  Friction  Sliding  wear Résumé : 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. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000409 [article] Engineering approach for the evaluation of mechanical wear considering the experimental holloman high - speed test track [texte imprimé] / Chad S. Hale, Auteur ; Anthony N. Palazotto, Auteur ; William P. Baker, Auteur . - 2012 . - pp.1127–1140. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1127–1140. Mots-clés : Holloman  High  Speed  Test  Track  (HHSTT)  High  velocity  wear  rate  VascoMax  300  maraging  steel  Friction  Sliding  wear Résumé : 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. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000409