Failure analysis of a CH-47 horizontal hinge pin assembly, P/N 114RS226 /

A CH-47D horizontal hinge pin assembly was examined to determine the root cause of ring and roller fracture and spalling. Chemical analyses, metallography, and hardness testing indicated that the rings and rollers conformed to the material requirements of the governing drawing. Metallography and vis...

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Bibliographic Details
Main Author:	Pepi, Marc S.
Corporate Authors:	U.S. Army Aviation and Missile Command, U.S. Army Research Laboratory
Other Authors:	Wechsler, Gary
Format:	Government Document eBook
Language:	English
Published:	Aberdeen Proving Ground, MD : Army Research Laboratory, [2006]
Series:	ARL-TR (Abderdeen Proving Ground, Md.) ; 4011.
Subjects:	Helicopters. Couplers, Fasteners, and Joints. Horizontal orientation. Failure(mechanics) Pins. Hinges. Test and evaluation. Scanning electron microscopes. Chemical analysis. Metallography. Hardness. Rollers. Rings. Fatigue(mechanics) Fracture(mechanics) Electron microscopy. Chinook (Military transport helicopter) Pins (Engineering) Metals > Fracture. Metals > Fatigue. CH-47D AIRCRAFT HORIZONTAL HINGE PIN
Online Access:	http://purl.fdlp.gov/GPO/gpo9239 http://handle.dtic.mil/100.2/ADA459785

Description
Summary:	A CH-47D horizontal hinge pin assembly was examined to determine the root cause of ring and roller fracture and spalling. Chemical analyses, metallography, and hardness testing indicated that the rings and rollers conformed to the material requirements of the governing drawing. Metallography and visual and scanning electron microscopy indicated the failure likely initiated in the lag ring due to rolling contact fatigue because of high-service loads.
Item Description:	Title from title screen (viewed on June 28, 2011). "December 2006." Electronic resource.
Physical Description:	1 online resource (viii, 28 pages) : illustrations (some color).
Bibliography:	Includes bibliographical references (page 26).
Access:	APPROVED FOR PUBLIC RELEASE.