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LDEF Mechanical SystemsFollowing LDEF retrieval, a number of studies were made of mechanical hardware and structure flown on the LDEF. The primary objectives are to determine the effects of long term space exposure on (1) mechanisms either used on LDEF or as part of individual experiments; (2) LDEF structural components; and (3) fasteners. Results from examination and testing of LDEF structure, fasteners, LDEF end support beam, environment exposure control canisters, experiment tray clamps, LDEF grapple fixtures, and viscous damper are presented. The most significant finding is the absence of space exposure related cold welding. The instances of seizure or removal difficulties initially attributed to cold welding were shown to have resulted from installation galling damage or improper removal techniques. Widespread difficulties encountered with removal of stainless steel fasteners underscore the need for effective thread lubrication schemes to ensure successful application of proposed orbital replacement units onboard Space Station Freedom.
Document ID
19920017871
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
W Steve Spear
(Boeing (United States) Chicago, Illinois, United States)
Harry W Dursch
(Boeing (United States) Chicago, Illinois, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Publication Information
Publication: LDEF- 69 Months in Space: First Post-Retrieval Symposium, Part 3
Subject Category
Mechanical Engineering
Meeting Information
Meeting: LDEF- 69 Months in Space: First Post-Retrieval Symposium
Location: Kissimmee, FL
Country: US
Start Date: June 2, 1991
End Date: June 6, 1991
Sponsors: National Aeronautics and Space Administration
Accession Number
92N27114
Funding Number(s)
CONTRACT_GRANT: NAS1-18224
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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