Enhanced Thermal Conductance in Graphite/Carbon-Carbon/SiC Heat Exchangers

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 20227
Amount: $53,334.00
Phase: Phase I
Program: SBIR
Awards Year: 1993
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Nuclear & Aerospace Materials
16716 Martincoit Road, Poway, CA, 92064
Duns: N/A
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Glen B. Engle
 (619) 487-0325
Business Contact
Phone: () -
Research Institution
N/A
Abstract
Advanced aircraft designs require thechnology improvements that incorporate the use of advanced materials and material systems for high specific stiffness and temperature capabilities. Improved crack detection and material property measurement techniques are required to support the development and verification of material systems. A development program is proposed that will improve for high-temperature application two thermography techniques to enable the quantification of flaws both in terms of geometry and stress intensity factors. Forced Diffusion Thermography (FDT) is an NDE method that uses projected, dynamic patterns of light to thermally excite a specimen structure with an oscillating thermal pattern that is synchronously imaged and processed for the detection of flaws. Thermoelastic Stress Analysis (TSA) is a differential thermography technique capable of nearly real-time measurement of mixed-mode stress intensity factors. Both FDT and TSA use the same dynamic thermography equipment to measure the small temperature fluctuations upon which these techniques are based. FDT and TSA have several attributes that will make them superior to other methods for assessing structural integrity in exteme environments. FDT and TSA are: noncontacting full-field techniques, not significantly impaired by convection currents or other anomalies in a high-temperature environment, able to work on a wide range of materials and composites, and able to produce standard (DC) thermal images as well as differential (AC) thermal images.

* information listed above is at the time of submission.

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