ASTM E83-02
(Practice)Standard Practice for Verification and Classification of Extensometer System
Standard Practice for Verification and Classification of Extensometer System
SCOPE
1.1 This practice covers procedures for the verification and classification of extensometer systems, but it is not intended to be a complete purchase specification. The practice is applicable only to instruments that indicate or record values that are proportional to changes in length corresponding to either tensile or compressive strain. Extensometer systems are classified on the basis of the magnitude of their errors.
1.2 Because strain is a dimensionless quantity, this document can be used for extensometers based on either SI or US customary units of displacement.
Note 1—Bonded resistance strain gages directly bonded to a specimen cannot be calibrated or verified with the apparatus described in this practice for the verification of extensometers having definite gage points. (See procedures as described in Test Methods E251.)
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E 83 – 02
Standard Practice for
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Verification and Classification of Extensometer System
ThisstandardisissuedunderthefixeddesignationE 83;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.1.1 calibration—a determination of the calibration factor
for a system using established procedures.
1.1 This practice covers procedures for the verification and
3.1.2 calibration factor—the factor by which the change in
classification of extensometer systems, but it is not intended to
extensometer reading must be multiplied to obtain the equiva-
beacompletepurchasespecification.Thepracticeisapplicable
lent strain.
only to instruments that indicate or record values that are
3.1.2.1 Discussion—For any extensometer, the calibration
proportional to changes in length corresponding to either
factor is equal to the ratio of change in length to the product of
tensile or compressive strain. Extensometer systems are clas-
the gage length and the change in the extensometer reading.
sified on the basis of the magnitude of their errors.
For direct-reading extensometers the calibration factor is unity.
1.2 Because strain is a dimensionless quantity, this docu-
3.1.3 compressometer—a specialized extensometer used for
ment can be used for extensometers based on either SI or US
sensing negative or compressive strain.
customary units of displacement.
3.1.4 deflectometer—a specialized extensometer used for
NOTE 1—Bonded resistance strain gages directly bonded to a specimen
sensing of extension or motion, usually without reference to a
cannot be calibrated or verified with the apparatus described in this
specific gage length.
practice for the verification of extensometers having definite gage points.
3.1.5 error, in extensometer systems—the value obtained by
(See procedures as described in Test Methods E 251.)
subtracting the correct value of the strain from the indicated
1.3 This standard does not purport to address all of the
value given by the extensometer system.
safety concerns, if any, associated with its use. It is the
3.1.6 extensometer, n—a device for sensing strain.
responsibility of the user of this standard to establish appro-
3.1.7 extensometer systems—a system for sensing and indi-
priate safety and health practices and determine the applica-
cating strain.
bility of regulatory limitations prior to use.
3.1.7.1 Discussion—The system will normally include an
extensometer, conditioning electronics and auxiliary device
2. Referenced Documents
(recorder, digital readout, computer, etc.). However, com-
2.1 ASTM Standards:
pletely self-contained mechanical devices are permitted. An
E 6 Terminology Relating to Methods of Mechanical Test-
extensometer system may be one of three types.
2
ing
3.1.8 Type 1 extensometer system, n—an extensometer sys-
E 21 Test Methods for Elevated Temperature Tension Tests
tem which both defines gage length and senses extension, for
2
of Metallic Materials
example, a clip-on strain gage type with conditioning electron-
E 251 Test Methods for Performance Characteristics of
ics.
2
Metallic Bonded Resistance Strain Gages
3.1.9 Type 2 extensometer system, n—an extensometer
which senses extension and the gage length is defined by
3. Terminology
specimen geometry or specimen features such as ridges or
3.1 Definitions: In addition to the terms listed, see Termi-
notches.
nology E 6.
3.1.9.1 Discussion—A Type 2 extensometer is used where
the extensometer gage length is determined by features on the
specimen, for example, ridges, notches, or overall height (in
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case of compression test piece). The precision associated with
This practice is under the jurisdiction ofASTM Committee E28 on Mechanical
Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of
gage length setting for a Type 2 extensometer should be
Mechanical Testing Machines and Apparatus.
specified in relevant test method or product standard. The
Current edition approved June 10, 2002. Published August 2002. Originally
e1 position readout on a testing machine is not recommended for
published as E 83 – 50. Last previous edition E 83 – 00 .
2
Annual Book of ASTM Standards, Vol 03.01. use in a Type 2 extensometer system.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E83–02
3.1.10 Type 3 extensometer system, n—an extensometer their limits of accuracy and sensitivity stated. The errors of the
system which intrinsically sen
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