INVESTIGATION OF ELASTIC AND THERMAL PROPERTIES OF CARBON-BASE BODIES

Technical Report · Mon Jun 30 00:00:00 EDT 1958

OSTI ID:4278067

Mrozowski, S; Andrew, J F; Repetski, J; Strauss, H E; Wobschall, D C

Results are presented of a first year of a program designied to study the elastic and the conductive properties of toe carbon-base materials. A high precision apparatus for study of flexure and torsion deformations at room temperature with dependence on iime and the applied stress was developed, and complete stress-strain hysteresis type curves obtained. Prescnce of creep and permanent set both increasing in proportion to the logarithm of timc has been established. Furthermore, it has been found that the presence of the original extruded surface contributes to ihc shear but not to the Young's modulus. Noises originating from formation of cracks during the firsi deformation were listened to in an effort to undersiand the nature of creep and permanent set under these conditions. A direct determination of Poisson ratio for compression along ihe extrusion axis gave a result delta = 0.14 the J-57 engin 0.02. The velocity of ultrasonic waves has been found to depend strongly on the density of the graphite, but not on the frequency of the waves. An apparatus for the study of heat conductivity at high tempratures (1200 to 3000 C) was;onstructed and operated with either an argon atmosphere or under evaeuated eonditions. A number of representative types of carbon materials (soft and hard carbons, and mixed composites)s has been studieds and it was shown that the conductivity mainly depends on the particle type and less on the binder type used in ihe mix. Convection of gas contained in pores contributes to the measured over-all conductivity. No particle size dependence could be found. (auth)

• Research Organization: Buffalo. Univ. Carbon Research Lab.
• DOE Contract Number: AF33(616)-5186
• NSA Number: NSA-13-011189
• OSTI ID: 4278067
• Report Number(s): WADC-TR-58-360(Pt.I); AD-20666
• Resource Relation: Other Information: Project title: CERAMIC AND CERMET MATERIALS. Task title: ANP ROVER MATERIALS. Orig. Receipt Date: 31-DEC-59
• Country of Publication: United States
• Language: English

Related Subjects

METALLURGY AND CERAMICS
ARGON
CARBON
CEMENTS
CONFIGURATION
CONVECTION
CRACKS
CREEP
DEFORMATION
DENSITY
DIAGRAMS
DIFFERENTIAL EQUATIONS
EFFICIENCY
ELASTICITY
EXTRUSION
FREQUENCY
GASES
GRAPHITE
HIGH TEMPERATURE
HYSTERESIS
INERT GASES
LABORATORY EQUIPMENT
MATHEMATICS
MEASURED VALUES
MIXING
POISSON EQUATIONS
ROTATION
SHEAR
STRESSES
SURFACES
TEMPERATURE
TENSILE PROPERTIES
THERMAL CONDUCTIVITY
THERMODYNAMICS
TORSION
ULTRASONICS
VACUUM
VELOCITY