NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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20040111983 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
Ultra-High Temperature Ceramic Composites for Leading Edges, 2004<br />
Levine, Stanley R.; Opila, Elizabeth J.; Lorincz, Jonathan A.; Singh, Mrityunjay; Robinson, Raymond C.; Ellerby, Donald T.;<br />
Gasch, Matthew J.; [2004]; 32 pp.; In English; 28th Annual Conference on Composites, Materials <strong>and</strong> Structures, 25-30 Jan.<br />
2004, Cape Canaveral, FL, USA<br />
Contract(s)/Grant(s): WBS 22-713-76-32; Copyright; Avail: CASI; A03, Hardcopy<br />
Ultrahigh temperature ceramics (UHTC) have performed unreliably due to material flaws <strong>and</strong> attachment design. These<br />
deficiencies are brought to the fore by the low fracture toughness <strong>and</strong> thermal shock resistance of the UHTC. If these<br />
deficiencies are overcome, we are still faced with poor oxidation resistance as a limitation on UHTC applicability to reusable<br />
launch vehicles. We have been addressing the deficiencies of UHTC for the past two years via a small task at GRC that is in<br />
the Airframe part of the Next Generation Launch Technology Program. Our focus is on composite constructions <strong>and</strong> functional<br />
grading to address the mechanical issues <strong>and</strong> on composition modification to address the oxidation issue. The progress on<br />
approaches to improving oxidation resistance by alloying <strong>and</strong> functional grading will be reported.<br />
Author<br />
Ceramic Matrix Composites; Leading Edges; Refractory Materials<br />
20040111984 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
C/SiC Life Prediction for Propulsion Applications<br />
Levine, Stanley R.; Verrilli, Michael J.; Opila, Elizabeth J.; Halbig, Michael C.; Calomino, Anthony M.; Thomas, David J.;<br />
August 29, 2003; 23 pp.; In English; 28th Annual Conference on Composites, Materials <strong>and</strong> Structures, 25-30 Jan. 2004, Cape<br />
Canaveral, FL, USA<br />
Contract(s)/Grant(s): WBS 713-82-32; Copyright; Avail: CASI; A03, Hardcopy<br />
Accurate life prediction is critical to successful use of ceramic matrix composites (CMCs). The tools to accomplish this<br />
are immature <strong>and</strong> not oriented toward the behavior of carbon fiber reinforced silicon carbide (C/SiC), the primary system of<br />
interest for many reusable <strong>and</strong> single mission launch vehicle propulsion <strong>and</strong> airframe applications. This paper describes an<br />
approach <strong>and</strong> progress made to satisfy the need to develop an integrated life prediction system that addresses mechanical<br />
durability <strong>and</strong> environmental degradation of C/SiC.<br />
Author<br />
Ceramic Matrix Composites; Life (Durability); Performance Prediction<br />
20040112003 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
Implementation of Higher Order Laminate Theory Into Strain Rate Dependent Micromechanics Analysis of Polymer<br />
Matrix Composites<br />
Kim, Heung Soo; Zhu, Linfa; Chattopadhyay, Aditi; Goldberg, Robert K.; 2004; 9 pp.; In English; 45th AIAA/ASME/ASCE/<br />
AHS/ASC Structures, Structural Dynamics <strong>and</strong> Materials Conference, 19-22 Apr. 2004, Palm Springs, CA, USA<br />
Contract(s)/Grant(s): NCC3-1024; WBS 714-30-02<br />
Report No.(s): AIAA Paper 2004-1638; Copyright; Avail: CASI; A02, Hardcopy<br />
A procedure has been developed to investigate the nonlinear response of composite plates under large strain <strong>and</strong> high<br />
strain rate loading. A recently developed strain dependent micromechanics model is extended to account for the shear effects<br />
during impact. Four different assumptions of shear deformation effects are investigated to improve the development strain rate<br />
dependent micromechanics model. A method to determine through the thickness strain <strong>and</strong> transverse Poisson’s ratio is<br />
developed. The revised micromechanics model is implemented into higher order laminate theory. Parametric studies are<br />
conducted to investigate transverse shear effects during impact.<br />
Author<br />
Polymer Matrix Composites; Micromechanics; Shear Stress; Strain Rate; Plates (Structural Members); Deformation<br />
20040112004 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
Mechanical Properties of Triaxial Braided Carbon/Epoxy Composites<br />
Bowman, C. L.; Roberts, G. D.; Braley, M. S.; Xie, M.; Booker, M. J.; [2003]; 7 pp.; In English; Materials <strong>and</strong> Processing:<br />
Enabling Flight...Our Legacy <strong>and</strong> Future, 28 Sep. - 2 Oct. 2003, Dayton, OH, USA<br />
Contract(s)/Grant(s): 708-24-05; No Copyright; Avail: CASI; A02, Hardcopy<br />
In an on-going effort to increase the safety <strong>and</strong> efficiency of turbine engines, the National Aeronautics <strong>and</strong> Space<br />
Administration is exploring lightweight alternatives to the metal containment structures that currently encase commercial jet<br />
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