NASA Scientific and Technical Aerospace Reports

20040050700 Oak Ridge Inst. for Science and Education, Aberdeen Proving Ground, MD
Ballistic Performance of Titanium Alloys: Ti-6Al- 4V Versus Russian Titanium
Jones, Tyrone L.; Feb. 2004; 25 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): 1120-1120-99
Report No.(s): AD-A420984; ARL-CR-0533; No Copyright; Avail: CASI; A03, Hardcopy
A Ti-6A1-4V baseline plate and a Russian titanium alloy plates were ballistically tested against .30-cal armor- piercing
(AP) M2 rounds. The V(50) ballistic limit of each plate was determined and compared to the MIL-DTL-46077F V(50) ballistic
acceptance chart for Ti-6Al-4V alloy. Based on these results, no clear ballistic performance advantage would be achieved by
using the Russian titanium alloy against 0.30-cal AP M2 threats.
DTIC
Aluminum Alloys; Ballistics; Titanium; Titanium Alloys; Vanadium Alloys
20040050701 Army Research Lab., Aberdeen Proving Ground, MD
Effect of Textured Surfactant Brushes on Polymer- Layered Silicate Nanocomposite Morphology
Kurian, Mary K.; Dasgupta, Arnab; Galvin, Mary E.; Beyer, Frederick L.; Feb. 2004; 23 pp.; In English; Original contains
color illustrations
Contract(s)/Grant(s): DAAD19-01-2-0001
Report No.(s): AD-A420985; ARL-TR-3136; No Copyright; Avail: CASI; A03, Hardcopy
Tbe morpbological bebavior of a series of polymer- layered silicate flaflocomposiWs (PLSNs) has been investigated. The
goal was to probe the effect of %Wxtured’ silicate surfaces on PLSN morphology. The nanocomposiWs were fabricated by
mixin% montmorillonite clay that was carefully modified with tailor-made polystyrene (PS) surfactants into a PS
homopolymer matrix, where the chemical similarity of the matrix polymer and surfactants ensures complete miscibility of
surfactant and homopolymer. To examine the effect of silicate surface %texture,‘ clay was modified with combinations of long
and short surtactants. The samples, characterized by small- angle x-ray scatwring (SAXS), were fl%en melt-am%ealed to
allow the equilibrirn% morphology to develop. Based on fl%e implications of tac Balazs model and otaer work on tac wefling
behavior of polymer melts, textured surfaces were expected to promote tac intercalation of the homopolymer matrix matenal
into the modified clay. ExWnsive d%aracWrization of bota tac modified clays as well as tac resultant NANOCOMPOSIWs
clearly showed that the modified clays exhibited a high degree of order, but also taat only phase-separated morphologies were
fon%ed in the corresponding nanocomposiWs.
DTIC
Brushes; Morphology; Nanocomposites; Plastics; Polystyrene; Silicates; Silicones; Surfactants
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NONMETALLIC MATERIALS
Includes physical, chemical, and mechanical properties of plastics, elastomers, lubricants, polymers, textiles, adhesives, and ceramic
materials. For composite materials see 24 Composite Materials.
20040045263 NASA Ames Research Center, Moffett Field, CA, USA
Processing, Properties and Arc Jet Testing of HfB2/SiC
Johnson, Sylvia M.; Beckman, Sarah; Irby, Edward; Ellerby, Don; Gasch, Matt; Gusman, Michael; January 2004; 45 pp.; In
English; Ultra-High Temperature Ceramic (UHTC) Materials Workshop, 5-7 Nov. 2003, Wintergreen, VA, USA; No
Copyright; Avail: CASI; A03, Hardcopy
Contents include the following: Background on Ultra High Temperature Ceramics - UHTCs. Summary UNTC processing:
power processing, scale-up. Preliminary material properties: mechanical, thermal. Arc jet testing: flat face models, cone
models. Summary.
CASI
Ceramics; High Temperature; Product Development
20040045290 NASA Ames Research Center, Moffett Field, CA, USA
Ablative Thermal Protection: An Overview
Lau, Bernie; [2003]; 22 pp.; In English; 55th Pacific Coast Regional and Basic Science Division Fall Meeting, 19-22 Oct.
2003, Oakland, CA, USA; No Copyright; Avail: CASI; A03, Hardcopy
Contents include the following: Why ablative thermal protections - TPS. Ablative TPS chronology: strategic reentry
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