PROGRESS REPORT NO. 6 FOR JANUARY 1, 1959 TO MARCH 31, 1959

Technical Report · Wed Apr 01 04:00:00 EST 1959

OSTI ID:4272706

Andrew, J F; Juul, N; Okada, J; Strauss, H E; Wobschall, D C; Mrozowski, S

The elastic properties of carbons and graphites at room temperature were investigated. Physical properties such as Young's and rigidity moduli were studied on samples after heat treatment in dry nitrogen. Results are discussed and presented graphically. Also, results of permanent set tests in laboratory- made soft filler rods are presented. Ultrasonic attenuation in carbon rods was measured, the results of which are graphically summarized, and the conclusions are drawn that the attenuation in rods of small particles is due primarily to hysteresis losses, while an additional attenuation due to scattering of sound waves by pores occurs at higher frequencies in rods made of larger particles. The magnitude of ultrasonic attenuation can be estimated from the size of the pores. A series of tests was made on carbon rods to determine the effect of the inert atmosphere on the thermal conductivity. Results of these investigations are discussed and graphically presented. Modifications to the thermal diffusivity apparatus are described as well as extrusion of soft and hard filler binder carbon samples. (For preceding period see NP7180.) (J.R.D.)

• Research Organization: Buffalo. Univ.
• NSA Number: NSA-13-011970
• OSTI ID: 4272706
• Report Number(s): NP-7446
• Country of Publication: United States
• Language: English

Related Subjects

CARBON
DIAGRAMS
ELASTICITY
FREQUENCY
GRAPHITE
HEAT TREATMENTS
HYSTERESIS
INERT GASES
LOSSES
MEASURED VALUES
NITROGEN
PARTICLES
PHYSICS AND MATHEMATICS
PLANNING
POROSITY
RODS
SCATTERING
SOUND
TESTING
THERMAL CONDUCTIVITY
THERMAL DIFFUSION
ULTRASONICS
YOUNG MODULUS