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http://hdl.handle.net/2014/40006
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| Title: | Experimental observations on material damping at cryogenic temperatures |
| Authors: | Peng, Chia-Yen
Levine, Marie
Shido, Lillian
Leland, Robert |
| Keywords: | measurement of materials
cryogenic temperatures
Terrestrial Planet Finder (TPF)
damping |
| Issue Date: | 2-Aug-2004 |
| Publisher: | Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004. |
| Citation: | SPIE 49th International Symposium on Optical Science and Technology, Denver, Colorado, August 2-6, 2004. |
| Abstract: | This paper describes a unique experimental facility designed to measure damping of materials at cryogenic temperatures for the Terrestrial Planet Finder (TPF) mission at the Jet Propulsion Laboratory. The test facility removes other sources of damping in the measurement by avoiding frictional interfaces, decoupling the test specimen from the support system, and by using a non-contacting measurement device. Damping data reported herein are obtained for materials (Aluminum, Aluminum/Terbium/Dysprosium, Titanium, Composites) vibrating in free-free bending modes with low strain levels (< ppm). The fundamental frequencies of material samples are ranged from 14 to 202 Hz. To provide the most beneficial data relevant to TPF-like precision optical space missions, the damping data are collected from room temperatures (around 293 K) to cryogenic temperatures (below 40 K) at unevenly-spaced intervals. More data points are collected over any region of interest. The test data shows a significant decrease in viscous damping at cryogenic temperatures. |
| URI: | http://hdl.handle.net/2014/40006 |
| Appears in Collections: | JPL TRS 1992+
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