ASTM E831 PDF

Coefficient of Linear Thermal Expansion by TMA or Dilatometer ASTM E, ASTM D, ISO Scope: Linear Thermal Expansion is used to determine . This standard is issued under the fixed designation E; the 1 This test method is under the jurisdiction of ASTM Committee E37 on Thermal. ASTM E Linear Thermal Expansion of Solid Materials by Thermomechanical Analysis_机械/仪表_工程科技_专业资料。Designation: E

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Influence of thermal a Standard Test Method f A number in parentheses indicates the year of last reapproval. Related zstm can be found in Refs. The test method may be used at lower or negative expansion levels with decreased accuracy and precision see Section The temperature range may be extended depending upon the instrumentation and calibration materials used.

NOTE 1—Users of this test method are expressly advised that all such instruments or techniques may not be equivalent. It e8311 the responsibility of the user to determine the necessary equivalency prior to use.

It is the responsibility of the user of this standard to establish appro- This test method is under the jurisdiction of ASTM Committee E37 on Thermal Measurements and is the direct responsibility of Subcommittee E Current edition approved March 15, Originally approved in Last previous edition approved in as E — The last approved version of this historical standard is referenced on www.

No further reproductions authorized. E — 06 ambient temperature, accompanying a unit change in temperature identi? Summary of Test Method 4. The coefficient aatm linear thermal expansion can be calculated from these recorded data.

Coefficient of Linear Thermal Expansion ASTM E831, ASTM D696, ISO 11359

asm This test method uses a smaller specimen and substantially different apparatus than Test Methods E and D Unless effects of moisture are to be studied, use of dry purge gas is recommended and is essential for operation at e8331 temperatures. Lateral dimensions shall not exceed 10 mm. Other lengths may be used, but shall be noted in the report.

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NOTE 3—It has been found with some materials that this level of? Specimens that do not meet these requirements may result in increased imprecision. Where some heat or mechanical treatment is applied to the specimen prior to test, this should be noted in the report.

NOTE 4—Some materials, particularly composites, may require heat treatment to condition the specimen prior to test to relieve stresses or distortions. Such heat treatment must be included in the report. The observed expansion must be corrected for the difference in expansion between the specimen holder and probe obtained from a blank run in which no sample or a e81 of the material of construction of the probe is run.

E83 5—Direct readout of zero position and specimen length using the analyzer sensing element, where available, with a sufficient range has been found to be an accurate means of length determination.

Place the specimen temperature sensor in contact with the specimen or as near to the specimen as possible. The refrigerant used for cooling shall not come into direct contact with the specimen. Depending on the compressibility of the specimen and the temperature range to be investigated, a force of between 1 and mN 0.

E — 06 is adequate. The actual incremental force, mass, or stress above that required to make contact with zero force shall be noted in the report. NOTE 6—Normally, the expansion increases with the increase in temperature as shown in the schematic diagram of Fig.

Coefficient of Linear Thermal Expansion ASTM E, ASTM D, ISO

An abrupt change in slope of the expansion curve indicates a transition of the material from one state to another. Other heating rates may be used but shall be noted in the report. NOTE 7—For best results, specimen temperature gradients should be small. High heating rates, large specimen sizes, and low specimen thermal conductivity may lead to large specimen temperature gradients.

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The effects of specimen temperature gradients may be compensated for by correction found through the use of suitable reference materials whose size and thermal astn are close to that of the test specimen.

The measured DL for the specimen ee831 normally be corrected for this instrument baseline, especially for low expansion specimens. Retest of a specimen may be atsm only as reference and shall not be treated as an independent test of a new specimen. The am shall not be calculated from a temperature range in which a transition point is noted. Precision and Bias 6 Maximum imprecision in the calculated coefficient of linear thermal expansion may be estimated from the imprecisions in the individual measurements by the following equation.

Material Testing Coefficient of Expansion,? ASTM International takes no position respecting the validity of any patent rights asserted in connection with s831 item mentioned in this standard.

Users of this standard are expressly asgm that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

ASTM E Linear Thermal Expansion of Solid Materials by Thermomechanical Analysis_百度文库

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard e81 for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the 8e31 address or at phonefaxor service astm.