Accession Number : ADA262185


Title :   The Design and Testing of a High-Temperature Graphite Dilatometer


Descriptive Note : Technical rept.


Corporate Author : AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS


Personal Author(s) : Sheaffer, Patrick M ; Henderson, George W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262185.pdf


Report Date : 24 Jun 1992


Pagination or Media Count : 46


Abstract : A dilatometer for investigating the high-temperature behavior of carbonaceous materials has been constructed within a graphite tube furnace in the Composites Section of the Mechanics and Materials Technology Center of The Aerospace Corporation. The dilatometer is a single-pushrod type with a linear variable differential transformer (LVDT) dilation measurement system and employs computer data acquisition and analysis. It can measure thermally induced strain of a sample from room temperature to over 3000 deg C, a temperature that has been difficult to reach with currently available laboratory apparatus. The estimated uncertainty of the dilation measurement system is about +/- 5 um over the entire temperature range. All components in the hot zone, including the sample holder and pushrod, are made of polycrystalline graphite. A three-point- bend fixture can be placed in the apparatus to measure the rheological properties of a pyrolyzing carbon precursor or the high-temperature creep properties of a carbon under conditions of constant flexural stress.


Descriptors :   *HIGH TEMPERATURE , *CARBON CARBON COMPOSITES , *DILATOMETERS , TEST AND EVALUATION , MEASUREMENT , UNCERTAINTY , GRAPHITE , CARBON , VARIABLES , CONSTANTS , POLYCRYSTALLINE , TRANSFORMERS , TUBES , PYROLYSIS , FURNACES , FLEXURAL PROPERTIES , RHEOLOGY , DATA ACQUISITION , CREEP , GLASSY CARBON , THERMAL EXPANSION , MECHANICS , ROOM TEMPERATURE , STRAIN(MECHANICS) , DEFLECTION , COMPUTERS , PRECURSORS


Subject Categories : Laminates and Composite Materials
      Test Facilities, Equipment and Methods
      Mechanics
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE