HIGH-TEMPERATURE TENSILE PROPERTIES OF GRAPHITES. Progress Report

Technical Report · Mon Sep 30 04:00:00 EDT 1957

OSTI ID:4233379

Martens, H E; Jaffe, L D; Jepson, J E

The tensile properties of six grades of graphite were determined at temperatures of 4000 to 5000 deg F. The specimens had a gage section which was 1/ 4 in. in diameter by 2 in. long; the specimens were heated in helium by an external graphite heater. At 4500 deg F ard above, the material exhibited some plasticity, and load-deformation curves were recorded. A peak in the strength- temperature curve at approximately 4500 deg F was Sound. Tensile strengths at 45OO deg F were, approximately double these at room temperature. With strain rates of 2.5 x 10/sup -5/ to 20 x 10/sup -5/per sec, all grades failed brittlely at 4000 deg F, with elongations of less than 1%. At 4500 deg F, elongations up to 5% were obtained, and at 5000 deg F, up a 20%. The reduction in area was always less than 5%. Elongations greater than 5%, therefore, caused decreases in density. Decreases in density up to 15% were found. These were proportional to the elongation. In both an extruded and a molded grade, the strength was greater and the elongation smaller when measured parallel to the grain. (auth) l6285 (((((((((Abstract unscannable))))))))) l6296 The design and construction of a thermal diffusion column free of ramification caused by the forgotten effect are reported. The operating characteristics of this column were also investigated. A comparison is made between the separating efficiency of the horizontal thermal diffusibn column and that of the thermogravitational column. An extensive compilation of the results obtained by previous investigators of liquid ppase thermal diffusion and an annotated bibliography on all phases of thermal diffusion containing 690 references are included. (W.L.H.)

• Research Organization: California Inst. of Tech., Pasadena. Jet Propulsion Lab.
• NSA Number: NSA-13-016294
• OSTI ID: 4233379
• Report Number(s): JPL-PR-20-326; AD-147339
• Country of Publication: United States
• Language: English

Related Subjects

DEFORMATION
DENSITY
GRAPHITE
HEATING
HELIUM
HIGH TEMPERATURE
MEASURED VALUES
PARTICLES
PHYSICS AND MATHEMATICS
QUANTITATIVE ANALYSIS
TENSILE PROPERTIES