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Long duration biaxial cylinder testing of balloon grade polyethylene films with emphasis on automated data acquisition and controlCharacterization of a 2-dimensional material constitutive model in the practical biaxial state for engineering utility of balloon envelope structural analysis is achievable with laboratory cylinder tests. Hoop (circumferential, and longitudinal strains are time-wise measured on axially loaded pressurized cylinders. Pre-programmed ramped loading changes as well as precise long term pressure control are achieved through cascaded proportional, integral derivative (PID) flow control loops that are part of an integrated data acquisition and process control system. Real time data reduction and analysis allow monitoring of unattended tests that have durations of up to a month. Measured and controlled parameters and variables are discussed; date analysis techniques are reviewed.
Document ID
19950034680
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Martone, Michael
(NASA Wallops Flight Facility, Wallops Island, VA US, United States)
Date Acquired
August 16, 2013
Publication Date
February 1, 1994
Publication Information
Publication: Advances in Space Research
Volume: 14
Issue: 2
ISSN: 0273-1177
Subject Category
Nonmetallic Materials
Accession Number
95A66279
Distribution Limits
Public
Copyright
Other

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