ASTM_E_2092_-_13.pdf

Designation:E209213Standard Test Method forDistortion Temperature in Three-Point Bending byThermomechanical Analysis1This standard is issued under the fixed designation E2092;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes the determination of thetemperature at which the specific modulus of a test specimen isrealized by deflection in three-point bending.This temperatureis identified as the distortion temperature.The distortiontemperature is that temperature at which a test specimen ofdefined geometry deforms to a level of strain under appliedstress of 0.455 MPa(66 psi)(Method A)and 1.82 MPa(264psi)(Method B)equivalent to those used in Test Method D648.The test may be performed over the range of temperature fromambient to 300C.NOTE1This test method is intended to provide results similar to thoseof Test Method D648 but are performed on a thermomechanical analyzerusing a smaller test specimen.Equivalence of results to those obtained byTest Method D648 has been demonstrated on a limited number ofmaterials.The results of this test method shall be considered to beindependent and unrelated to those of Test Method D648 unless the userdemonstrates equivalence.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.1.4 There is no ISO standard equivalent to this test method.2.Referenced Documents2.1 ASTM Standards:2D648 Test Method for Deflection Temperature of PlasticsUnder Flexural Load in the Edgewise PositionE473 Terminology Relating to Thermal Analysis and Rhe-ologyE1142 Terminology Relating to Thermophysical PropertiesE1363 Test Method for Temperature Calibration of Thermo-mechanical AnalyzersE2113 Test Method for Length Change Calibration of Ther-momechanical AnalyzersE2206 Test Method for Force Calibration of Thermome-chanical Analyzers3.Terminology3.1 DefinitionsSpecific technical terms used in this stan-dard are defined in Terminologies E473 and E1142,includingthermomechanical analyzer.3.1.1 distortion temperature C,nthe temperature atwhich an arbitrary strain level is obtained in three-pointbending under an arbitrary load.3.1.2 strain,r mm/m,nthe dimension change in normal-izing dimension due to an applied force.3.1.3 stress,S Pa=N/m2,nforce per unit area.4.Summary of Test Method4.1 A test specimen of known dimensions is tested inthree-point bending mode.A known stress is applied to thecenter of a test specimen supported near its ends,as it is heatedat a constant rate from ambient temperature to the uppertemperature limit for the material.The deflection of the testspecimen is recorded as a function of temperature.Thetemperature at which a predetermined level of strain is ob-served in the test specimen is analyzed as the distortiontemperature.5.Significance and Use5.1 Data obtained by this test method shall not be used topredict the behavior of materials at elevated temperaturesexcept in applications in which the conditions of time,temperature,method of loading,and stress are similar to thosespecified in the test.5.2 This standard is particularly suited for quality controland development work.The data are not intended for use indesign or predicting endurance at elevated temperatures.1This test method is under the jurisdiction of Committee E37 on ThermalMeasurements and is the direct responsibility of Subcommittee E37.10 onFundamental,Statistical and Mechanical Properties.Current edition approved Sept.1,2013.Published October 2013.Originallyapproved in 2000.Last previous edition approved in 2009 as E2092 09.DOI:10.1520/E2092-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandardsvolume information,refer tot he standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Apparatus6.1 A thermomechanical analyzer consisting of:6.1.1 Rigid Specimen Holder,of inert,low expansivitymaterial 20 m m-1 C-1to center the specimen in thefurnace and to fix the specimen to mechanical ground.6.1.2 Flexure Fixture,of inert,low expansivity material 20m m-1 C-1,to support the test specimen in a three-pointbending mode(see Fig.1).6.1.3 Rigid Knife Edge Compression Probe,of inert,lowexpansivity material 20 m m-1 C-1that contacts thespecimen with an applied compression force(see Fig.1).6.1.4 Deflection Sensing El