ASTM E83-23
(Practice)Standard Practice for Verification and Classification of Extensometer Systems
Standard Practice for Verification and Classification of Extensometer Systems
ABSTRACT
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. The apparatus for verifying extensometer systems shall provide a means for applying controlled displacements to a simulated specimen and for measuring these displacements accurately. Extensometer systems shall be classified in accordance with the requirements as to maximum error of strain indicated: Class A; Class B-1; Class B-2; Class C; Class D; and Class E. Extensometer systems shall be categorized in three types according to gage length: Type 1; Type 2; and Type 3. A verification procedure for extensometer systems shall be done in accordance with the specified requirements.
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 gauges directly bonded to a specimen cannot be calibrated or verified with the apparatus described in this practice for the verification of extensometers having definite gauge 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E83 − 23
Standard Practice for
1
Verification and Classification of Extensometer Systems
This standard is issued under the fixed designation E83; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* E251 Test Methods for Performance Characteristics of Me-
tallic Bonded Resistance Strain Gages
1.1 This practice covers procedures for the verification and
3
2.2 Other Standards:
classification of extensometer systems, but it is not intended to
JCGM 100:2008 Evaluation of measurement data – Guide to
be a complete purchase specification. The practice is applicable
the expression of uncertainty in measurement
only to instruments that indicate or record values that are
proportional to changes in length corresponding to either
3. Terminology
tensile or compressive strain. Extensometer systems are clas-
sified on the basis of the magnitude of their errors.
3.1 Definitions:
3.1.1 In addition to the terms listed, see Terminology E6.
1.2 Because strain is a dimensionless quantity, this docu-
3.1.2 calibration—a determination of the calibration factor
ment can be used for extensometers based on either SI or US
for a system using established procedures.
customary units of displacement.
3.1.3 calibration factor—the factor by which the change in
NOTE 1—Bonded resistance strain gauges directly bonded to a speci-
extensometer reading must be multiplied to obtain the equiva-
men cannot be calibrated or verified with the apparatus described in this
practice for the verification of extensometers having definite gauge points. lent strain.
(See procedures as described in Test Methods E251.)
3.1.3.1 Discussion—For any extensometer, the calibration
1.3 This standard does not purport to address all of the factor is equal to the ratio of change in length to the product of
safety concerns, if any, associated with its use. It is the the gauge length and the change in the extensometer reading.
responsibility of the user of this standard to establish appro- For direct-reading extensometers the calibration factor is unity.
priate safety, health, and environmental practices and deter-
3.1.4 compressometer—a specialized extensometer used for
mine the applicability of regulatory limitations prior to use.
sensing negative or compressive strain.
1.4 This international standard was developed in accor-
3.1.5 deflectometer—a specialized extensometer used for
dance with internationally recognized principles on standard-
sensing of extension or motion, usually without reference to a
ization established in the Decision on Principles for the
specific gauge length.
Development of International Standards, Guides and Recom-
3.1.6 dot/line tracking optical extensometer system (DLT),
mendations issued by the World Trade Organization Technical
n—an optical extensometer system that uses marks at an
Barriers to Trade (TBT) Committee.
initially known distance, physically placed on a specimen or
calibration fixture, to establish the gauge length value for
2. Referenced Documents
determination of strain.
2
2.1 ASTM Standards:
3.1.7 error, in extensometer systems—the value obtained by
E6 Terminology Relating to Methods of Mechanical Testing
subtracting the correct value of the strain from the indicated
E21 Test Methods for Elevated Temperature Tension Tests of
value given by the extensometer system.
Metallic Materials
3.1.8 extensometer, n—a device for sensing strain.
3.1.9 extensometer systems—a system for sensing and indi-
1
This practice is under the jurisdiction of ASTM Committee E28 on Mechanical
cating strain.
Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of
3.1.9.1 Discussion—The system will normally include an
Mechanical Testing Machines and Apparatus.
Current edition approved Jan. 1, 2023. Published February 2023. Originally
extensometer, conditioning electronics and auxiliary device
approved in 1950. Last previous edition approved in 2016 as E83 – 16. DOI:
10.1520/E0083-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Organization for Standardization (ISO), ISO
Standards volume information, refer to the standard’s Document Summary page on Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
the ASTM website. Gene
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E83 − 16 E83 − 23
Standard Practice for
1
Verification and Classification of Extensometer Systems
This standard is issued under the fixed designation E83; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. 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 gauges directly bonded to a specimen cannot be calibrated or verified with the apparatus described in this practice for
the verification of extensometers having definite gauge 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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
E6 Terminology Relating to Methods of Mechanical Testing
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E251 Test Methods for Performance Characteristics of Metallic Bonded Resistance Strain Gages
3
2.2 Other Standards:
JCGM 100:2008 Evaluation of measurement data – Guide to the expression of uncertainty in measurement
3. Terminology
3.1 Definitions:
1
This practice is under the jurisdiction of ASTM Committee E28 on Mechanical Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of
Mechanical Testing Machines and Apparatus.
Current edition approved Dec. 15, 2016Jan. 1, 2023. Published January 2017February 2023. Originally approved in 1950. Last previous edition approved in 20102016
as E83 – 10a.E83 – 16. DOI: 10.1520/E0083-16.10.1520/E0083-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from International Organization for Standardization (ISO), ISO Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
Switzerland, http://www.iso.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E83 − 23
3.1.1 In addition to the terms listed, see Terminology E6.
3.1.2 calibration—a determination of the calibration factor for a system using established procedures.
3.1.3 calibration factor—the factor by which the change in extensometer reading must be multiplied to obtain the equivalent
strain.
3.1.3.1 Discussion—
For any extensometer, the calibration factor is equal to the ratio of change in length to the product of the gauge length and the
change in the extensometer reading. For direct-reading extensometers the calibration factor is unity.
3.1.4 compressometer—a specialized extensometer used for sensing negative or compressive strain.
3.1.5 deflectometer—a specialized extensometer used for sensing of extension or motion, usually without reference to a specific
gauge length.
3.1.6 dot/line tracking optical extensometer system (DLT), n—an optical extensometer system that uses marks at an initially known
distance, physically placed on a specimen or calibration fi
...
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