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Bi-axial Strain Measurement of Woven-Webbing Inflatable Structures Using Digital Image Correlation with RGB FilteringCrewed inflatable softgoods structures can significantly reduce launch volume for habitable pressure vessels. To ensure the operational safety of these structures, NASA has developed an extensive testing program to evaluate the structural capability on ground test articles. This paper will discuss a current challenge faced by test engineers evaluating the strain of large-scale inflatable space structures during ground testing. Namely, the difficulty that arises using monochrome digital image correlation (DIC) to evaluate bi-axial strain for woven-webbing restraint layers. This report provides insight into a novel method of photogrammetry using red-green-blue (RGB) filtering in conjunction with DIC to evaluate the strain in each direction on a test article experiencing bi-directional strain. To evaluate this concept, a uniaxial tensile test was performed that represented a biaxial woven architecture using orthogonally interfaced straps. The resulting analysis demonstrates promise for this novel approach for isolating a specific region and direction of strain, reducing the effects of straps not in the area of interest, while allowing for a larger region of analysis. Moreover, it was shown that the application of a white basecoat prior to applying photogrammetry patterns significantly reduced data loss while performing RGB filtered DIC.
Document ID
20230017668
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Scott N Bender
(Johnson Space Center Houston, United States)
Carson Ohland
(Johnson Space Center Houston, United States)
Ryan P Brown
(Johnson Space Center Houston, United States)
Doug Litteken
(Johnson Space Center Houston, United States)
Date Acquired
December 4, 2023
Subject Category
Structural Mechanics
Meeting Information
Meeting: 2024 AIAA SciTech Forum
Location: Orlando, FL
Country: US
Start Date: January 8, 2024
End Date: January 12, 2024
Sponsors: American Institute of Aeronautics and Astronautics
Funding Number(s)
PROJECT: NextSTEP Habitation
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Technical Review
Single Expert
Keywords
inflatable
softgoods
digital image correlation
vic-3d
structure
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