Read Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface

Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface

National Aeronautics and Space Administration

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Description:The International Space Station's starboard Solar Alpha Rotary Joint (SARJ) experienced a breakdown of the joint's race ring surface. The starboard SARJ mechanism was cleaned and lubricated with grease. To provide some guidance on the expected behavior of the damaged SARJ ring with continued operations, experiments were conducted using rollers and a vacuum roller test rig. The approach of the experimental work involved three main steps: (1) initiate damage using conditions representative of the SARJ with inadequate lubrication; (2) propagate the damage by operating the test rollers without lubrication; and (3) assess the durability of the roller by testing to simulate the equivalent of 15 years of SARJ operation on the damaged surface assuming adequate grease lubrication. During the rig testing, additional and/or replacement grease was introduced at regular intervals to maintain good lubrication in the rig. The damage to the nitride layer continued even after application of grease. The grease lubrication proved to be effective for limiting the value of the axial force that can be developed. Limiting the axial force on the SARJ mechanism is important since the larger the axial force the more concentrated the load pressure becomes on the blend-radius location on the SARJ roller. After the testing simulating 15 years of SARJ operations, the wear depths were the order of 0.2 mm for the nitrided 15-5 roller and the order of 0.06 mm for the mating 440C roller. Metallographic inspections were done to search for indications of impending fatigue or other fracture indications that might eventually propagate and cause structural failure. There were no indications or features found that could eventually compromise structural integrity. Krantz, Timothy L. and Elchert, Justin P. and DellaCorte, Christopher and Dube, Michael J. Glenn Research Center INTERNATIONAL SPACE STATION; SOLAR ARRAYS; JOINTS (JUNCTIONS); GREASES; LUBRICATION; NITRIDING; WEAR; DAMAGE ASSESSMENT; ROLLERS; LOAWe have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface. To get started finding Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface, you are right to find our website which has a comprehensive collection of manuals listed.
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Pages: 54

Format: PDF, EPUB & Kindle Edition

Publisher: Createspace Independent Publishing Platform

Release: 2018

ISBN: 1719509166

Description: The International Space Station's starboard Solar Alpha Rotary Joint (SARJ) experienced a breakdown of the joint's race ring surface. The starboard SARJ mechanism was cleaned and lubricated with grease. To provide some guidance on the expected behavior of the damaged SARJ ring with continued operations, experiments were conducted using rollers and a vacuum roller test rig. The approach of the experimental work involved three main steps: (1) initiate damage using conditions representative of the SARJ with inadequate lubrication; (2) propagate the damage by operating the test rollers without lubrication; and (3) assess the durability of the roller by testing to simulate the equivalent of 15 years of SARJ operation on the damaged surface assuming adequate grease lubrication. During the rig testing, additional and/or replacement grease was introduced at regular intervals to maintain good lubrication in the rig. The damage to the nitride layer continued even after application of grease. The grease lubrication proved to be effective for limiting the value of the axial force that can be developed. Limiting the axial force on the SARJ mechanism is important since the larger the axial force the more concentrated the load pressure becomes on the blend-radius location on the SARJ roller. After the testing simulating 15 years of SARJ operations, the wear depths were the order of 0.2 mm for the nitrided 15-5 roller and the order of 0.06 mm for the mating 440C roller. Metallographic inspections were done to search for indications of impending fatigue or other fracture indications that might eventually propagate and cause structural failure. There were no indications or features found that could eventually compromise structural integrity. Krantz, Timothy L. and Elchert, Justin P. and DellaCorte, Christopher and Dube, Michael J. Glenn Research Center INTERNATIONAL SPACE STATION; SOLAR ARRAYS; JOINTS (JUNCTIONS); GREASES; LUBRICATION; NITRIDING; WEAR; DAMAGE ASSESSMENT; ROLLERS; LOAWe have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface. To get started finding Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface

Roller Testing to Mimic Damage of the ISS Sarj Ring and Durability Test to Simulate Fifteen Years of Sarj Operation Using the Damaged Surface

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