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Design and Use of a Guided Weight Impactor to Impart Barely Visible Impact DamageAircraft structure is required to demonstrate satisfaction of the FAR requirements for Category 1, such as barely visible impact damage (BVID). Typical aircraft structure is impacted using a dropped weight impactor, which can impart BVID to the top surface of the structure. A recent test of a multi-bay box (MBB) composite test article, that represents an 80% scale center section of a hybrid wing body aircraft, required impact to be in a direction other than vertical from above, but still in an direction that is normal to the surface. This requirement eliminated the use of the conventional dropped weight impactor. Therefore, a design study was undertaken to determine the most effective way to efficiently and reliably impact the MBB. The chosen design was a guided weight impactor that is gravity driven. This paper describes the design of the guided weight impactor, and presents the results of its use for imparting BVID to the MBB. The guided weight impactor was seen to be a very reliable method to impart BVID, while at the same time having the capability to be highly configurable for use on other aircraft structure that is impacted at a variety of impact energies and from a variety of directions.
Document ID
20160006304
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Lovejoy, Andrew E. (NASA Langley Research Center Hampton, VA, United States)
Przekop, Adam (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
May 17, 2016
Publication Date
April 1, 2016
Subject Category
Structural Mechanics
Report/Patent Number
L-20636
NF1676L-23049
NASA/TM-2016-218977
Funding Number(s)
WBS: WBS 338881.02.22.07.01.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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