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Accelerated creep testing of high strength aramid webbing
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Doggett, William R. Valverde, Omar Stnfield, Clarence E. Jones, Thomas C. |
| Copyright Year | 2012 |
| Description | A 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. |
| File Size | 3202843 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120012000 |
| Archival Resource Key | ark:/13960/t4dn94k58 |
| Language | English |
| Publisher Date | 2012-04-23 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Time Dependence Accelerated Life Tests Fiber Strength Graphical User Interface Aramid Fiber Composites Strain Measurement Creep Tests Photogrammetry Webbing Loads Forces Inflatable Space Structures Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
