Accession Number:

AD0753392

Title:

A Laboratory Method for Thermal Fracture of Graphite

Descriptive Note:

Rept. for Dec 1970-May 1972

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Personal Author(s):

• Eckert, Hans U.

Report Date:

1972-10-31

Pagination or Media Count:

42.0

Abstract:

A method was developed for producing thermal stress failure in ATJ-S graphite and the initial results are described. Test specimens are 10-cm-long hollow cylinders with outer and inner radii of 1.9 and 0.4 cm, respectively. The outside is heated by induction at a frequency of 1.4 MHz by a 100-kW power oscillator the inside is kept below 100C by forcing water at a rate of 5 gpm through the copper-coated bore. A special lead soldering technique has been developed to fasten the coolant ducts to the specimen. The inductor coil is protected by an oil bath against heat and electric breakdown.

Descriptors:

• *GRAPHITE
• HIGH TEMPERATURE
• FRACTURE(MECHANICS)
• INDUCTION HEATING
• THERMAL STRESSES
• TEST METHODS

Subject Categories:

• Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE