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Time-Dependent Behavior of High-Strength Kevlar and Vectran WebbingHigh-strength Kevlar and Vectran webbings are currently being used by both NASA and industry as the primary load-bearing structure in inflatable space habitation modules. The time-dependent behavior of high-strength webbing architectures is a vital area of research that is providing critical material data to guide a more robust design process for this class of structures. This paper details the results of a series of time-dependent tests on 1-inch wide webbing including an initial set of comparative tests between specimens that underwent realtime and accelerated creep at 65 and 70% of their ultimate tensile strength. Variability in the ultimate tensile strength of the webbings is investigated and compared with variability in the creep life response. Additional testing studied the effects of load and displacement rate, specimen length and the time-dependent effects of preconditioning the webbings. The creep test facilities, instrumentation and test procedures are also detailed. The accelerated creep tests display consistently longer times to failure than their real-time counterparts; however, several factors were identified that may contribute to the observed disparity. Test setup and instrumentation, grip type, loading scheme, thermal environment and accelerated test postprocessing along with material variability are among these factors. Their effects are discussed and future work is detailed for the exploration and elimination of some of these factors in order to achieve a higher fidelity comparison.
Document ID
20140003948
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)
Date Acquired
April 28, 2014
Publication Date
January 13, 2014
Subject Category
Nonmetallic Materials
Report/Patent Number
AIAA Paper 2014-1328
NF1676L-16713
Report Number: AIAA Paper 2014-1328
Report Number: NF1676L-16713
Meeting Information
Meeting: AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Location: Narional Harbor, MD
Country: United States
Start Date: January 13, 2014
End Date: January 17, 2014
Sponsors: American Society of Mechanical Engineers, American Society of Civil Engineers, American Helicopter Society, Inc., American Society for Composites, American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 149030.04.01.03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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