ASTM E2658-15(2023)

Standard Practices for Verification of Speed for Material Testing Machines

SIGNIFICANCE AND USE
4.1 Material testing requires repeatable and predictable testing machine speed. The speed measuring devices integral to the testing machines may be used for measurement of crosshead speed over a defined range of operation. The accuracy of the speed value shall be traceable to a National or International Standards Laboratory. Practices E2658 provides procedures to verify testing machines, in order that the indicated speed values may be traceable. A key element to having traceability is that the devices used in the verification produce known speed characteristics, and have been calibrated in accordance with adequate calibration standards.  
4.2 Verification of testing machine speed at a minimum consists of either or both of the following options:  
4.2.1 Verifying the capability of the testing machine to move the crosshead at the speed selected.  
4.2.2 Verifying the capability of the testing machine to adequately indicate the speed of the crosshead.  
4.3 Where applicable, determine the testing machine's ramp-to-speed condition. This condition can be significant especially when verifying fast speeds or testing conditions with very short testing durations.  
4.4 This procedure will establish the relationship between the actual crosshead speed and the testing machine indicated speed and or selected setting. It is this relationship that will allow confidence in the reported displacement over time data acquired by the testing machine during use.
Note 1: Many material tests never reach the desired test speed. Unless the actual data from the material test is examined, it is often impossible to know if the test speed has been reached or is repeatable from test to test.
SCOPE
1.1 These practices cover procedures and requirements for the calibration and verification of testing machine speed by means of standard calibration devices. This practice is not intended to be complete purchase specifications for testing machines.  
1.2 These practices apply to the verification of the speed application and measuring systems associated with the testing machine, such as a scale, dial, marked or unmarked recorder chart, digital display, setting, etc. In all cases the buyer/owner/user must designate the speed-measuring system(s) to be verified.  
1.3 These practices give guidance, recommendations, and examples, specific to electro-mechanical testing machines. The practice may also be used to verify actuator speed for hydraulic testing machines.  
1.4 This standard cannot be used to verify cycle counting or frequency related to cyclic fatigue testing applications.  
1.5 Since conversion factors are not required in this practice, either SI units (mm/min), or English [in/min], can be used as the standard.  
1.6 Speed measurement values and or settings on displays/printouts of testing machine data systems-be they instantaneous, delayed, stored, or retransmitted-which are within the Classification criteria listed in Table 1, comply with Practices E2658.  
1.7 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.  
1.8 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.

General Information

• Status: Published
• Publication Date: 31-Aug-2023
• ICS: 19.060 - Mechanical testing
• Technical Committee: E28 - Mechanical Testing
• Drafting Committee: E28.01 - Calibration of Mechanical Testing Machines and Apparatus

Standards Content (Sample)

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: E2658 − 15 (Reapproved 2023)
Standard Practices for
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Verification of Speed for Material Testing Machines
This standard is issued under the fixed designation E2658; 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.
1. Scope mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 These practices cover procedures and requirements for
the calibration and verification of testing machine speed by
2. Referenced Documents
means of standard calibration devices. This practice is not
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2.1 ASTM Standards:
intended to be complete purchase specifications for testing
E2309 Practices for Verification of Displacement Measuring
machines.
Systems and Devices Used in Material Testing Machines
1.2 These practices apply to the verification of the speed
application and measuring systems associated with the testing
3. Terminology
machine, such as a scale, dial, marked or unmarked recorder
3.1 Definitions:
chart, digital display, setting, etc. In all cases the buyer/owner/
3.1.1 percent error, n—in the case of a speed measuring
user must designate the speed-measuring system(s) to be
system, the ratio, expressed as a percent, of the error to the
verified.
reference value of the applied speed.
1.3 These practices give guidance, recommendations, and
3.1.1.1 Discussion—The speed, as measured by the testing
examples, specific to electro-mechanical testing machines. The
machine, and the speed, as computed from the readings of the
practice may also be used to verify actuator speed for hydraulic
calibration devices, shall be recorded at each verified speed.
testing machines.
The percent error, shall be calculated from this data as follows:
1.4 This standard cannot be used to verify cycle counting or
Percent Error 5 @~TMsp 2 Refsp!/Refsp# × 100 (1)
frequency related to cyclic fatigue testing applications.
where:
1.5 Since conversion factors are not required in this
TMsp = speed measured by the machine being verified,
practice, either SI units (mm/min), or English [in/min], can be
mm/min [in/min], and
used as the standard.
Refsp = reference value of the measured speed, mm/min
[in/min], as determined by the calibration device.
1.6 Speed measurement values and or settings on displays/
printouts of testing machine data systems-be they
Not all testing machines have available indicated speed
instantaneous, delayed, stored, or retransmitted-which are
values. In such cases, the verification of the testing ma-
within the Classification criteria listed in Table 1, comply with
chine’s speed setting is applicable. The percent error for the
Practices E2658.
testing machine speed settings, shall be calculated as fol-
1.7 This standard does not purport to address all of the lows:
safety concerns, if any, associated with its use. It is the
Percent Error 5 TMsps 2 Refsp /Refsp × 100 (2)
@~ ! #
responsibility of the user of this standard to establish appro-
where:
priate safety, health, and environmental practices and deter-
TMsps = testing machine speed setting, mm/min (in/min),
mine the applicability of regulatory limitations prior to use.
and
1.8 This international standard was developed in accor-
Refsp = reference value of the measured speed, mm/min
dance with internationally recognized principles on standard-
(in/min), as determined by the calibration device.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 3.1.2 ramp-to-speed condition, n—during a speed verifica-
tion run, it is the time and or change in displacement required
to achieve a constant speed condition.
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These practices are under the jurisdiction of ASTM Committee E28 on
Mechanical Testing and is the direct responsibility of Subcommittee E28.01 on
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Calibration of Mechanical Testing Machines and Apparatus. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2023. Published September 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2011. Last previous edition approved in 2015 as E2658–15. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/E2658–15R23. the ASTM website.
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E2658 − 15 (2023)
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