NASA Scientific and Technical Aerospace Reports - The University ...

20100017862 NASA Johnson Space Center, Houston, TX, USA; NASA White Sands Test Facility, NM, USA
Develop Critical Profilometers to Meet Current and Future Composite Overwrapped Pressure Vessel (COPV) Interior
Inspection Needs
Saulsberry, Regor L.; [2010]; 5 pp.; In English; Original contains color and black and white illustrations
Report No.(s): JSC-CN-19668; No Copyright; Avail.: CASI: A01, Hardcopy
ONLINE: http://hdl.handle.net/2060/20100017862
The objective of this project is to develop laser profilometer technology that can efficiently inspect and map the inside
of composite pressure vessels for flaws such as liner buckling, pitting, or other surface imperfections. The project will also
provide profilometers that can directly support inspections of flight vessels during development and qualification programs and
subsequently be implemented into manufacturing inspections to screen out vessels with ‘out of family’ liner defects. An
example interior scan of a carbon overwrapped bottle is shown in comparison to an external view of the same bottle (Fig. 1).
The internal scan is primarily of the cylindrical portion, but extends about 0.15 in. into the end cap area.
Author
Pressure Vessels; Defects; Buckling; Pitting; Profilometers; Inspection; Composite Wrapping
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GEOSCIENCES (GENERAL)
Includes general research topics related to the Earth sciences, and the specific areas of petrology, mineralogy, and general geology. For
other specific topics in geosciences see categories 42 through 48.
20100017166 Missouri Univ. of Science and Technology, Rolla, MO, USA
Post-Cyclic Behavior of Low Plasticity Silt Under Full and Limited Liquefaction Using Triaxial Compression Testing.
Final
Wang, Shuying; February 2010; 21 pp.; In English
Report No.(s): PB2010-105607; No Copyright; Avail.: National Technical Information Service (NTIS)
The objective of this work is to investigate the post-cyclic behavior of low plasticity silt under the full and limited
liquefaction and the effect of PI on the post-liquefaction behavior. After determining the index properties, cyclic triaxial testing
will be carried out to study the liquefaction resistance. All of specimens will be normally consolidated before cyclic loading.
Once after the silt specimens liquefy, the excess pore water pressure will be dissipated at different levels and then implement
the different effective reconsolidation pressure. The post-liquefaction monotonic shear testing will be conducted for the
specimens experiencing the different levels of reconsolidation in order to study the effect of different levels of reconsolidation
on post-liquefaction shear strength. For the specimens after limited liquefaction, no reconsolidation will be allowed to study
the effect of different levels of duration of cyclic loading on the post-cyclic behaviors of the low plasticity silt.
NTIS
Earthquakes; Liquefaction; Plastic Properties; Sediments
20100017287 NASA Marshall Space Flight Center, Huntsville, AL, USA
Pulling Marbles from a Bag: Deducing the Regional Impact History of the SPA Basin from Impact-Melt Rocks
Cohen, Barbara A.; Coker, Robert F.; March 1, 2010; 3 pp.; In English; Lunar and Planetary Science Conference, 1-5 Mar.
2010, Houston, TX, USA; Original contains color illustrations
Report No.(s): M10-0238; M10-0349; No Copyright; Avail.: CASI: A01, Hardcopy
ONLINE: http://hdl.handle.net/2060/20100017287
The South Pole Aitken (SPA) basin is the stratigraphically oldest identifiable lunar basin and is therefore one of the most
important targets for absolute age-dating to help understand whether ancient lunar bombardment history smoothly declined
or was punctuated by a cataclysm. A feasible near-term approach to this problem is to robotically collect a sample from near
the center of the basin, where vertical and lateral mixing provided by post-basin impacts ensures that such a sample will be
composed of small rock fragments from SPA itself, from local impact craters, and from faraway giant basins. The range of
ages, intermediate spikes in the age distribution, and the oldest ages are all part of the definition of the absolute age and impact
history recorded within the SPA basin.
Derived from text
Impact Melts; Rocks; Structural Basins; Lunar Surface; Histories
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