| Shot-Peening Sensitivity of Aluminum With Corrosion-Preventive Coatings |
NOV 2007 |
60 pages |
| Authors:
Scott Grendahl; Daniel Snoha; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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 | The U.S. Army Aviation and Missile Research, Development, and Engineering Center Aviation Engineering Division (Huntsville, AL) requested that the U.S. Army Research Laboratory Weapons and Materials Research Directorate (Aberdeen Proving Ground, MD) execute a program aimed at evaluating the shot-peening sensitivity of 7075-T73 aluminum with U.S. Army corrosion-preventive coatings for aluminum. The coatings represent the two most common coatings for aviation aluminum alloys. The study was a follow-up to previous ... |
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| Shot-Peening Sensitivity of Aerospace Materials |
MAY 2007 |
154 pages |
| Authors:
Scott Grendahl; Daniel Snoha; Benjamin Hardisky; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The U.S. Army Aviation and Missile Research Development and Engineering Command (AMRDEC), Aviation Engineering Division in Huntsville, AL requested that the U.S. Army Research Laboratory, Weapons and Materials Research Directorate at Aberdeen Proving Ground, MD develop and execute a program aimed at evaluating the shot-peening sensitivity of several aerospace materials. The materials represent the four most common metals utilized on U.S. Army aviation shot-peened components. The study had three main ... |
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| FPI and MPI of Cracks Under Coatings |
JAN 2007 |
72 pages |
| Authors:
Scott Grendahl; Benjamin Hardisky; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The U.S. Army Aviation and Missile Research Development and Engineering Center requested that the U.S. Army Research Laboratory develop and execute a program designed to evaluate the performance of nondestructive inspection (NDI) techniques over typical army aviation paint systems. Corpus Christi Army Depot performs the majority of the current maintenance and overhaul operations on army aviation systems. This facility would greatly benefit in throughput and in reduction of hazardous waste ... |
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| Effect of the FlashJet Paint Removal System on Rotor Blade Skin Materials |
DEC 2006 |
36 pages |
| Authors:
Scott Grendahl; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The U.S. Army Aviation and Missile Research, Development, and Engineering Command in Huntsville, AL, requested the U.S. Army Research Laboratory Weapons and Materials Research Directorate at Aberdeen Proving Ground, MD, to develop and execute a program aimed at evaluating the effect of the FlashJet coating removal system on the mechanical properties of the typical U.S. Army aviation blade skin materials. The skin materials representative of the three most common U.S. ... |
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| Failure Analysis of OH-58 Kiowa Warrior Drive Gear Shafts |
JUN 2006 |
60 pages |
| Authors:
Scott Grendahl; Victor Champagne; Dan Snoha; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| A 15-hp spare drive gear from a 250-C30/R3 engine on an OH-58 Kiowa Warrior failed in service, causing loss of AC power. The failed gear, all recovered teeth, and the driving pinion were sent to the U.S. Army Research Laboratory for investigation. This investigation focused on determining the mode of failure and any possible metallurgical or manufacturing contribution to this failure. Analysis included optical and scanning electron microscopy, chemical analysis, ... |
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| Failure Analysis of a Cracked UH-1 Tailboom Former, P/N 205-030-807-97 |
JUN 2006 |
30 pages |
| Authors:
Scott Grendahl; Benjamin Hardisky; Russell Yocum; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The U.S. Army Aviation and Missile Command sent the U.S. Army Research Laboratory Weapons and Materials Research Directorate a UH-1 tailboom former (P/N 201030-807-97) from the U.S. Army Kwajalein Atoll Facility (USAKA) in the Marshall Islands for investigation. The component was being investigated due to the presence of cracks observed near bolt hole locations on the part. This component was quality deficient report exhibit number M24H90327. The material utilized to ... |
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| Failure Analysis of a Cracked CH-47 Swashplate Rotating Ring, S/N BCW-1379 |
JUN 2006 |
28 pages |
| Authors:
Scott Grendahl; Russell Yocum; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| The U.S. Aviation and Missile Command sent the U.S. Army Research Laboratory s Weapons and Materials Research Directorate three swashplate rotating rings from the CH-47 helicopter for investigation. The components were examined due to the presence of cracks found during routine overhaul. These cracks were on and adjacent to the bearing retention shoulder. One of these rotating rings, S/N BCW-1379, was included for a detailed failure analysis to determine the ... |
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| Failure Analysis of a Pitch Link Self-Locking Nut MS 17825-10 |
APR 1996 |
13 pages |
| Authors:
Scott Grendahl; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The Aviation and Troop Command (ATCOM) shipped a broken self-locking nut to the Army Research Laboratory-Materials Directorate (ARL-MD) and requested a metallurgical investigation to determine the probable cause of failure. The component was received on 31 October 95, hexagon shaped, castellated self-locking nut, MS 17825-10, was attached to the lower end of the pitch link located on an army attack helicopter. The outside of the nut contained the manufacturer's designation ... |
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| Failure Analysis of Modular Lift Link, Lug Mounting, Self-Locking Nuts |
APR 1996 |
13 pages |
| Authors:
Scott Grendahl; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The U.S. Army Research Laboratory-Materials Directorate (USARL-MD) conducted a failure analysis of two self-locking nuts from an army attack helicopter, at the request of the U.S. Army Aviation and Troop Command (ATCOM). Light optical and scanning electron microscopy were utilized to characterize the fracture halves of the broken nuts. The self-locking nuts are governed by Specification MS21042, Nut, Self- Locking, 450 deg F, Reduced Hexagon, Reduced Height, Ring Base, Non-Corrosion ... |
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