NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Accelerated Creep Testing of High Strength Aramid WebbingA series of preliminary accelerated creep tests were performed on four variants of 12K and 24K lbf rated Vectran webbing to help develop an accelerated creep test methodology and analysis capability for high strength aramid webbings. The variants included pristine, aged, folded and stitched samples. This class of webbings is used in the restraint layer of habitable, inflatable space structures, for which the lifetime properties are currently not well characterized. The Stepped Isothermal Method was used to accelerate the creep life of the webbings and a novel stereo photogrammetry system was used to measure the full-field strains. A custom MATLAB code is described, and used to reduce the strain data to produce master creep curves for the test samples. Initial results show good correlation between replicates; however, it is clear that a larger number of samples are needed to build confidence in the consistency of the results. It is noted that local fiber breaks affect the creep response in a similar manner to increasing the load, thus raising the creep rate and reducing the time to creep failure. The stitched webbings produced the highest variance between replicates, due to the combination of higher local stresses and thread-on-fiber damage. Large variability in the strength of the webbings is also shown to have an impact on the range of predicted creep life.
Document ID
20120012000
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Jones, Thomas C.
(NASA Langley Research Center Hampton, VA, United States)
Doggett, William R.
(NASA Langley Research Center Hampton, VA, United States)
Stnfield, Clarence E.
(NASA Langley Research Center Hampton, VA, United States)
Valverde, Omar
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
August 26, 2013
Publication Date
April 23, 2012
Subject Category
Structural Mechanics
Report/Patent Number
AIAA Paper 2012-1771
NF1676L-13173
Meeting Information
Meeting: 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Location: Honolulu, HI
Country: United States
Start Date: April 23, 2012
End Date: April 26, 2012
Sponsors: Department of the Navy, Department of the Air Force, Department of the Army
Funding Number(s)
WBS: WBS 944244.04.04.04
Distribution Limits
Public
Copyright
Public Use Permitted.
No Preview Available