SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS

A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 43, ISSUE 20 - OCTOBER 07, 2005

01 AERONAUTICS (GENERAL)
Includes general research topics related to manned and unmanned aircraft and the problems of flight within the Earth's atmosphere.

Also includes manufacturing, maintenance, and repair of aircraft.

For specific topics in aeronautics, see categories 02 through 09.

For information related to space vehicles see 12 Astronautics.

20050217136 Purdue Univ., West Lafayette, IN, USA

Materials Issues Arising From Transient and Unsteady Loads in Combustion Devices Farris, T. N.; Fifth International Symposium on Liquid Space Propulsion; January 2005; 31 pp.; In English; See also 20050217123; Original contains color and black and white illustrations; No Copyright; Avail.: CASI: A03, Hardcopy

Fretting fatigue is used as an example of failure arising from unsteady loads. Topics include: Successful prediction of fretting fatigue lives at room temperature; Elevated temperature experiments; Overview of experimental results; Fractography; Analysis of the experiments; and Conclusions and future work. Derived from text.

Combustion; Transient Loads; Fretting; Fractography; Failure

20050217140 Purdue Univ., West Lafayette, IN, USA

Subscale Test Methods for Combustion Devices Anderson, W. E.; Sisco, J. C.; Long, M. R.; Sung, I.-K.; Fifth International Symposium on Liquid Space Propulsion; January 2005; 40 pp.; In English; See also 20050217123; Original contains color and black and white illustrations Contract(s)/Grant(s): NAG8-1856; NAG8-1876; NAG8-1894; No Copyright; Avail.: CASI: A03, Hardcopy

Stated goals for long-life LRE s have been between 100 and 500 cycles: 1) Inherent technical difficulty of accurately defining the transient and steady state thermochemical environments and structural response (strain); 2) Limited statistical basis on failure mechanisms and effects of design and operational variability; and 3) Very high test costs and budget-driven need to protect test hardware (aversion to test-to-failure). Ambitious goals will require development of new databases: a) Advanced materials, e.g., tailored composites with virtually unlimited property variations; b) Innovative functional designs to exploit full capabilities of advanced materials; and c) Different cycles/operations. Subscale testing is one way to address technical and budget challenges: 1) Prototype subscale combustors exposed to controlled simulated conditions; 2) Complementary to conventional laboratory specimen database development; 3) Instrumented with sensors to measure thermostructural response; and 4) Coupled with analysis. Derived from text.

Combustion; Failure; Structural Strain; Thermochemistry; Data Bases; Prototypes

Source: NASA.