ASTM E467-21
(Practice)Standard Practice for Verification of Constant Amplitude Dynamic Forces in an Axial Fatigue Testing System
Standard Practice for Verification of Constant Amplitude Dynamic Forces in an Axial Fatigue Testing System
SIGNIFICANCE AND USE
4.1 It is well understood how to measure the forces applied to a specimen under static conditions. Practices E4 details the required process for verifying the static force measurement capabilities of testing machines. During dynamic operation however, additional errors may manifest themselves in a testing machine. Further verification is necessary to confirm the dynamic force measurement capabilities of testing machines.
Note 1: The static machine verification accomplished by Practices E4 simply establishes the reference. Indicated forces measured from the force cell are compared with the dynamometer conditioned forces statically for confirmation and then dynamically for dynamic verification of the fatigue testing system's force output.
Note 2: The dynamic accuracy of the force cell's output will not always meet the accuracy requirement of this standard without correction. Dynamic correction to the force cell output can be applied provided that verification is performed after the correction has been applied.
Note 3: Overall test accuracy is a combination of measurement accuracy and control accuracy. This practice provides methods to evaluate either or both. As control accuracy is dependent on many more variables than measurement accuracy it is imperative that the test operator utilize appropriate measurement tools to confirm that the testing machine’s control behavior is consistent between verification activities and actual testing activities.
4.2 Dynamic errors are primarily span dependent, not level dependent. That is, the error for a particular force endlevel during dynamic operation is dependent on the immediately preceding force endlevel. Larger spans imply larger absolute errors for the same force endlevel.
4.3 Due to the many test machine factors that influence dynamic force accuracy, verification is recommended for every new combination of potential error producing factors. Primary factors are specimen design, machine configuration, test frequenc...
SCOPE
1.1 This practice covers procedures for the dynamic verification of cyclic force amplitude control or measurement accuracy during constant amplitude testing in an axial fatigue testing system. It is based on the premise that force verification can be done with the use of a strain gaged elastic element. Use of this practice gives assurance that the accuracies of forces applied by the machine or dynamic force readings from the test machine, at the time of the test, after any user applied correction factors, fall within the limits recommended in Section 9. It does not address static accuracy which must first be addressed using Practices E4 or equivalent.
1.2 Verification is specific to a particular test machine configuration and specimen. This standard is recommended to be used for each configuration of testing machine and specimen. Where dynamic correction factors are to be applied to test machine force readings in order to meet the accuracy recommended in Section 9, the verification is also specific to the correction process used. Finally, if the correction process is triggered or performed by a person, or both, then the verification is specific to that individual as well.
1.3 It is recognized that performance of a full verification for each configuration of testing machine and specimen configuration could be prohibitively time consuming and/or expensive. Annex A1 provides methods for estimating the dynamic accuracy impact of test machine and specimen configuration changes that may occur between full verifications. Where test machine dynamic accuracy is influenced by a person, estimating the dynamic accuracy impact of all individuals involved in the correction process is recommended. This practice does not specify how that assessment will be done due to the strong dependence on owner/operators of the test machine.
1.4 This practice is intended to be used periodically. Consistent results between verifications is e...
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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:E467 −21
Standard Practice for
Verification of Constant Amplitude Dynamic Forces in an
1
Axial Fatigue Testing System
This standard is issued under the fixed designation E467; 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 obtain consistent results between verifications using the same
machine configuration implies uncertain accuracy for dynamic
1.1 This practice covers procedures for the dynamic verifi-
tests performed during that time period.
cation of cyclic force amplitude control or measurement
accuracy during constant amplitude testing in an axial fatigue
1.5 This practice addresses the accuracy of the testing
testing system. It is based on the premise that force verification
machine’s force control or indicated forces, or both, as
can be done with the use of a strain gaged elastic element. Use
compared to a dynamometer’s indicated dynamic forces. Force
of this practice gives assurance that the accuracies of forces
controlverificationisonlyapplicablefortestsystemsthathave
appliedbythemachineordynamicforcereadingsfromthetest
some form of indicated force peak/valley monitoring or am-
machine, at the time of the test, after any user applied
plitude control. For the purposes of this verification, the
correction factors, fall within the limits recommended in
dynamometer’s indicated dynamic forces will be considered
Section 9. It does not address static accuracy which must first
the true forces. Phase lag between dynamometer and force
be addressed using Practices E4 or equivalent.
transducer indicated forces is not within the scope of this
1.2 Verification is specific to a particular test machine
practice.
configuration and specimen. This standard is recommended to
be used for each configuration of testing machine and speci- 1.6 TheresultsofeithertheAnnexA1calculationorthefull
men.Wheredynamiccorrectionfactorsaretobeappliedtotest
experimental verification must be reported per Section 10 of
machine force readings in order to meet the accuracy recom-
this standard.
mended in Section 9, the verification is also specific to the
1.7 This practice provides no assurance that the shape of the
correction process used. Finally, if the correction process is
actual waveform conforms to the intended waveform within
triggered or performed by a person, or both, then the verifica-
any specified tolerance.
tion is specific to that individual as well.
1.3 It is recognized that performance of a full verification 1.8 Thisstandardisprincipallyfocusedatroomtemperature
for each configuration of testing machine and specimen con-
operation. It is believed there are additional issues that must be
figuration could be prohibitively time consuming and/or ex-
addressed when testing at high temperatures. At the present
pensive. Annex A1 provides methods for estimating the dy-
time, this standard practice must be viewed as only a partial
namic accuracy impact of test machine and specimen
solution for high temperature testing.
configuration changes that may occur between full verifica-
1.9 The values stated in inch-pound units are to be regarded
tions.Where test machine dynamic accuracy is influenced by a
as standard. No other units of measurement are included in this
person, estimating the dynamic accuracy impact of all indi-
standard.
viduals involved in the correction process is recommended.
This practice does not specify how that assessment will be
1.10 This standard does not purport to address all of the
done due to the strong dependence on owner/operators of the
safety concerns, if any, associated with its use. It is the
test machine.
responsibility of the user of this standard to establish appro-
1.4 This practice is intended to be used periodically. Con- priate safety, health, and environmental practices and deter-
sistent results between verifications is expected. Failure to
mine the applicability of regulatory limitations prior to use.
1.11 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1
This practice is under the jurisdiction ofASTM Committee E08 on Fatigue and
Fractureand is the direct responsibility of Subcommittee E08.03 on Advanced ization established in the Decision on Principles for the
Apparatus and Techniques.
Development of International Standards, Guides and Recom-
Current edition approved April 15, 2021. Published April 2021. Originally
mendations issued by the World Trade Organization Techni
...
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: E467 − 08 (Reapproved 2014) E467 − 21
Standard Practice for
Verification of Constant Amplitude Dynamic Forces in an
1
Axial Fatigue Testing System
This standard is issued under the fixed designation E467; 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
1.1 This practice covers procedures for the dynamic verification of cyclic force amplitude control or measurement accuracy during
constant amplitude testing in an axial fatigue testing system. It is based on the premise that force verification can be done with
the use of a strain gaged elastic element. Use of this practice gives assurance that the accuracies of forces applied by the machine
or dynamic force readings from the test machine, at the time of the test, after any user applied correction factors, fall within the
limits recommended in Section 9. It does not address static accuracy which must first be addressed using Practices E4 or
equivalent.
1.2 Verification is specific to a particular test machine configuration and specimen. This standard is recommended to be used for
each configuration of testing machine and specimen. Where dynamic correction factors are to be applied to test machine force
readings in order to meet the accuracy recommended in Section 9, the verification is also specific to the correction process used.
Finally, if the correction process is triggered or performed by a person, or both, then the verification is specific to that individual
as well.
1.3 It is recognized that performance of a full verification for each configuration of testing machine and specimen configuration
could be prohibitively time consuming and/or expensive. Annex A1 provides methods for estimating the dynamic accuracy impact
of test machine and specimen configuration changes that may occur between full verifications. Where test machine dynamic
accuracy is influenced by a person, estimating the dynamic accuracy impact of all individuals involved in the correction process
is recommended. This practice does not specify how that assessment will be done due to the strong dependence on owner/operators
of the test machine.
1.4 This practice is intended to be used periodically. Consistent results between verifications is expected. Failure to obtain
consistent results between verifications using the same machine configuration implies uncertain accuracy for dynamic tests
performed during that time period.
1.5 This practice addresses the accuracy of the testing machine’s force control or indicated forces, or both, as compared to a
dynamometer’s indicated dynamic forces. Force control verification is only applicable for test systems that have some form of
indicated force peak/valley monitoring or amplitude control. For the purposes of this verification, the dynamometer’s indicated
dynamic forces will be considered the true forces. Phase lag between dynamometer and force transducer indicated forces is not
within the scope of this practice.
1
This practice is under the jurisdiction of ASTM Committee E08 on Fatigue and Fractureand is the direct responsibility of Subcommittee E08.03 on Advanced Apparatus
and Techniques.
Current edition approved May 1, 2014April 15, 2021. Published September 2014April 2021. Originally approved in 1972. Last previous edition approved in 20082014
ε1
as E467E467–08(2014).–08 . DOI: 10.1520/E0467-08R14.10.1520/E0467-21.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E467 − 21
1.6 The results of either the Annex A1 calculation or the full experimental verification must be reported per Section 10 of this
standard.
1.7 This practice provides no assurance that the shape of the actual waveform conforms to the intended waveform within any
specified tolerance.
1.8 This standard is principally focused at room temperature operation. It is believed there are additional issues that must be
addressed when testing at high temperatures. At the present time, this standard practice must be viewed as only a partial solution
for high temperature testing.
1.9 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this
standard.
1.10 This standard does not purport to address all of the safety concerns,
...
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