Accession Number : ADA263080


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


Corporate Author : AEROSPACE CORP EL SEGUNDO CA MECHANICS AND MATERIALS TECHNOLOGY CENTER


Personal Author(s) : Sheaffer, P M ; Henderson, G W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263080.pdf


Report Date : 24 Jun 1992


Pagination or Media Count : 47


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 + or - 5 micrometers 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. Carbon, Dilatometry, Graphite, Thermal strain, Pyrolysis, Glassy carbon, Composites carbon-carbon, Thermal expansion.


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


Subject Categories : Physical Chemistry
      Laminates and Composite Materials
      Mechanics
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE