ASTM E83-16

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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 14-Dec-2016
• ICS: 19.060 - Mechanical testing
• Technical Committee: E28 - Mechanical Testing
• Drafting Committee: E28.01 - Calibration of Mechanical Testing Machines and Apparatus

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E83 − 16
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* 3. Terminology
1.1 This practice covers procedures for the verification and 3.1 Definitions:
classification of extensometer systems, but it is not intended to
3.1.1 In addition to the terms listed, see Terminology E6.
be a complete purchase specification. The practice is applicable
3.1.2 calibration—a determination of the calibration factor
only to instruments that indicate or record values that are
for a system using established procedures.
proportional to changes in length corresponding to either
3.1.3 calibration factor—the factor by which the change in
tensile or compressive strain. Extensometer systems are clas-
extensometer reading must be multiplied to obtain the equiva-
sified on the basis of the magnitude of their errors.
lent strain.
1.2 Because strain is a dimensionless quantity, this docu-
3.1.3.1 Discussion—For any extensometer, the calibration
ment can be used for extensometers based on either SI or US
factor is equal to the ratio of change in length to the product of
customary units of displacement.
the gauge length and the change in the extensometer reading.
For direct-reading extensometers the calibration factor is unity.
NOTE 1—Bonded resistance strain gauges directly bonded to a speci-
men cannot be calibrated or verified with the apparatus described in this
3.1.4 compressometer—a specialized extensometer used for
practice for the verification of extensometers having definite gauge points.
sensing negative or compressive strain.
(See procedures as described in Test Methods E251.)
3.1.5 deflectometer—a specialized extensometer used for
1.3 This standard does not purport to address all of the
sensing of extension or motion, usually without reference to a
safety concerns, if any, associated with its use. It is the
specific gauge length.
responsibility of the user of this standard to establish appro-
3.1.6 error, in extensometer systems—the value obtained by
priate safety and health practices and determine the applica-
subtracting the correct value of the strain from the indicated
bility of regulatory limitations prior to use.
value given by the extensometer system.
2. Referenced Documents
3.1.7 extensometer, n—a device for sensing strain.
2
2.1 ASTM Standards:
3.1.8 extensometer systems—a system for sensing and indi-
E6 Terminology Relating to Methods of Mechanical Testing
cating strain.
E21 Test Methods for Elevated Temperature Tension Tests of
3.1.8.1 Discussion—The system will normally include an
Metallic Materials
extensometer, conditioning electronics and auxiliary device
E251 Test Methods for Performance Characteristics of Me-
(recorder, digital readout, computer, etc.). However, com-
tallic Bonded Resistance Strain Gages
3
pletely self-contained mechanical devices are permitted. An
2.2 Other Standards:
extensometer system may be one of three types.
JCGM 100:2008 Evaluation of measurement data – Guide to
the expression of uncertainty in measurement 3.1.9 Type 1 extensometer system, n—an extensometer sys-
tem which both defines gauge length and senses extension, for
1
This practice is under the jurisdiction of ASTM Committee E28 on Mechanical example, a clip-on strain gauge type with conditioning elec-
Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of
tronics.
Mechanical Testing Machines and Apparatus.
Current edition approved Dec. 15, 2016. Published January 2017. Originally 3.1.10 Type 2 extensometer system, n—an extensometer
approved in 1950. Last previous edition approved in 2010 as E83 – 10a. DOI:
which senses extension and the gauge length is defined by
10.1520/E0083-16.
specimen geometry or specimen features such as ridges or
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
notches.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
3.1.10.1 Discussion—A Type 2 extensometer is used where
the ASTM website.
the extensometer gauge length is determined by features on the
3
Available from International Organization for Standardization (ISO), ISO
specimen, for example, ridges, notches, or overall height (in
Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
Geneva, Switzerland, http://www.iso.org
...

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 − 10a E83 − 16
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 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 health practices and determine the applicability of regulatory
limitations prior to use.
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:
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.
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 June 1, 2010Dec. 15, 2016. Published July 2010January 2017. Originally approved in 1950. Last previous edition approved in 2010 as
E83 – 10.E83 – 10a. DOI: 10.1520/E0083-10A.10.1520/E0083-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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.
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.
*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 − 16
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 error, in extensometer systems—the value obtained by subtracting the correct value of the strain from the indicated value
given by the extensometer system.
3.1.7 extensometer, n—a device for sensing strain.
3.1.8 extensometer systems—a system for sensing and indicating strain.
3.1.8.1 Discussion—
The system will normally include an extensometer, conditioning electronics and auxiliary device (recorder, digital readout,
computer, etc.). However, completely self-contained mechanical devices are permitted. An extensometer system may be
...