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Title: INVESTIGATION OF ELASTIC AND THERMAL PROPERTIES OF CARBON-BASE BODIES

Abstract

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 ofmore » 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)« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Buffalo. Univ. Carbon Research Lab.
OSTI Identifier:
4278067
Report Number(s):
WADC-TR-58-360(Pt.I); AD-20666
NSA Number:
NSA-13-011189
DOE Contract Number:
AF33(616)-5186
Resource Type:
Technical Report
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
Subject:
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

Citation Formats

Mrozowski, S., Andrew, J.F., Repetski, J., Strauss, H.E., and Wobschall, D.C.. INVESTIGATION OF ELASTIC AND THERMAL PROPERTIES OF CARBON-BASE BODIES. United States: N. p., 1958. Web.
Mrozowski, S., Andrew, J.F., Repetski, J., Strauss, H.E., & Wobschall, D.C.. INVESTIGATION OF ELASTIC AND THERMAL PROPERTIES OF CARBON-BASE BODIES. United States.
Mrozowski, S., Andrew, J.F., Repetski, J., Strauss, H.E., and Wobschall, D.C.. Mon . "INVESTIGATION OF ELASTIC AND THERMAL PROPERTIES OF CARBON-BASE BODIES". United States. doi:.
@article{osti_4278067,
title = {INVESTIGATION OF ELASTIC AND THERMAL PROPERTIES OF CARBON-BASE BODIES},
author = {Mrozowski, S. and Andrew, J.F. and Repetski, J. and Strauss, H.E. and Wobschall, D.C.},
abstractNote = {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)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 30 00:00:00 EDT 1958},
month = {Mon Jun 30 00:00:00 EDT 1958}
}

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