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Tran K.N.,Naval Surface Warfare Center Carderock Division | Salamanca-Riba L.,University of Maryland University College
Advanced Engineering Materials | Year: 2013

Sensitized aluminum 5456-H116 is characterized by a continuous network of β phase. The use of ultrasonic impact treatment refines the near surface microstructure to produce nanograins that vary in size from 2 to 200 nm in diameter. The deformation layer does not exhibit the presence of a continuous β phase indicating that the near surface microstructure undergoes recrystallization. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Costanzo F.A.,Naval Surface Warfare Center Carderock Division
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2011

This paper presents a brief introduction to the basic fundamentals of underwater explosions, including discussion of the features of explosive charge detonation, the formation and characterization of the associated shock wave, bulk cavitation effects, gas bubble formation and dynamics, surface effects and shock wave refraction characteristics. Illustrations of each of these fundamental aspects of underwater explosion (UNDEX) loadings are made with a set of videos from a variety of experimental testing events. In addition, analyses of associated measured loading and dynamic response data, as well as descriptions of supporting numerical simulations of these events are presented. At the conclusion of this paper, each of these UNDEX effects are tied together with a summary discussion and illustration. ©2010 Society for Experimental Mechanics Inc.

Lang B.W.,Naval Surface Warfare Center Carderock Division
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2011

This paper presents an overview of a recently published American National Standard [1] to be used for testing equipment that will be subjected to shock. This standard provides shock test parameters for testing a broad range of equipment, which will ensure inherent levels of shock resistance. It defines test requirements and severity thresholds for a large range of shock environments, including but not limited to shipping, transport, and rugged operational environments. The severity thresholds herein can be associated with specific shock environments and should be chosen for a given application on a case-by-case basis. The intent of the standard's requirements is to outline those elements necessary for verification of a successful and accurate shock test, but not the specific test method. This standard will allow vendors to better market, and users to more easily identify, equipment that will operate or simply survive in rugged shock environments. ©2010 Society for Experimental Mechanics Inc.

Gibson B.T.,Vanderbilt University | Lammlein D.H.,Naval Surface Warfare Center Carderock Division | Prater T.J.,United Launch Alliance | Longhurst W.R.,Austin Peay State University | And 5 more authors.
Journal of Manufacturing Processes | Year: 2014

This article provides an introduction to the basic principles of friction stir welding (FSW) as well as a survey of the latest research and applications in the field. The basic principles covered include terminology, material flow, joint configurations, tool design, materials, and defects. Material flow is discussed from both an experimental and a modeling perspective. Process variants are discussed as well, which include self-reacting (SR-FSW), stationary shoulder, friction stir processing (FSP), friction stir spot welding (FSSW), assisted FSW, and pulsed FSW. Multiple aspects of robotic friction stir welding are covered, including sensing, control, and joint tracking. Methods of evaluating weld quality are surveyed as well. The latest applications are discussed, with an emphasis on recent advances in aerospace, automotive, and ship building. Finally, the direction of future research and potential applications are examined. © 2013 The Society of Manufacturing Engineers.

Ginn H.L.,University of South Carolina | Hingorani N.,EPRI | Sullivan J.R.,Naval Surface Warfare Center Carderock Division | Wachal R.,Manitoba HVDC Research Center Inc.
Proceedings of the IEEE | Year: 2015

When the control functions of various types of power electronics systems are examined, a significant degree of common functionality emerges, irrespective of the target application. It is possible to define hierarchical control architectures for these systems using common interface definitions between control system divisions or layers. Such definitions enable the use of common designs for multiple applications and the use of commercially available electronics and communications modules allowing cost reduction in power electronics applications. This paper presents various partitioning strategies of a hierarchical control architecture for use in high power electronics control systems and defines various parameters/functions that need to be handled within each layer, and those that need to be communicated between the layers. Each layer has characteristic processing and communication speed requirements, irrespective of the final applications. © 1963-2012 IEEE.

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