ISO 4965-2:2012
(Amendment)Metallic materials — Dynamic force calibration for uniaxial fatigue testing — Part 2: Dynamic calibration device (DCD) instrumentation
Metallic materials — Dynamic force calibration for uniaxial fatigue testing — Part 2: Dynamic calibration device (DCD) instrumentation
In order to perform a dynamic calibration of a uniaxial testing system, it is necessary to measure the forces experienced by the test-piece to known levels of accuracy; this measurement is made by a dynamic calibration device (DCD) in place of the test-piece and the calibration method is described in ISO 4965-1. ISO 4965-2:2012 defines the calibration procedure for the DCD's instrumentation. The method for the analysis of the results is also described, leading to a range of testing frequencies over which the instrumentation is valid for use with DCDs in accordance with ISO 4965-1.
Matériaux métalliques — Étalonnage de la force dynamique uniaxiale pour les essais de fatigue — Partie 2: Instrumentation pour équipement d'étalonnage dynamique
General Information
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Standards Content (sample)
INTERNATIONAL ISO
STANDARD 4965-2
First edition
2012-07-15
Metallic materials — Dynamic force
calibration for uniaxial fatigue testing —
Part 2:
Dynamic calibration device (DCD)
instrumentation
Matériaux métalliques — Étalonnage de la force dynamique uniaxiale
pour les essais de fatigue —
Partie 2: Instrumentation pour équipement d’étalonnage dynamique
Reference number
ISO 4965-2:2012(E)
ISO 2012
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ISO 4965-2:2012(E)
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ii © ISO 2012 – All rights reserved
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ISO 4965-2:2012(E)
Contents Page
Foreword ............................................................................................................................................................................iv
Introduction ........................................................................................................................................................................ v
1 Scope ...................................................................................................................................................................... 1
2 Terms, definitions, and symbols ..................................................................................................................... 1
3 Principle ................................................................................................................................................................. 2
4 General requirements ......................................................................................................................................... 2
4.1 Temperature .......................................................................................................................................................... 2
4.2 DCD instrumentation .......................................................................................................................................... 2
4.3 Dynamic voltage reference standard ............................................................................................................. 2
5 Calibration procedure ........................................................................................................................................ 3
5.1 DC calibration ....................................................................................................................................................... 3
5.2 Sinusoidal calibration ........................................................................................................................................ 3
6 Calculation of results ......................................................................................................................................... 4
6.1 DC calibration results ......................................................................................................................................... 4
6.2 Sinusoidal calibration results .......................................................................................................................... 4
7 Calibration report ................................................................................................................................................ 5
7.1 General information ............................................................................................................................................ 5
7.2 Results of calibration ......................................................................................................................................... 5
7.3 Re-calibration ....................................................................................................................................................... 5
Annex A (informative) Calibration frequency content............................................................................................... 6
Bibliography ....................................................................................................................................................................... 9
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ISO 4965-2:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 4965-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 5, Fatigue testing.This first edition of ISO 4965-2, together with ISO 4965-1, cancels and replaces ISO 4965:1979, which has
been technically revised.ISO 4965 consists of the following parts, under the general title Metallic material — Dynamic force calibration
for uniaxial fatigue testing:— Part 1: Testing systems
— Part 2: Dynamic calibration device (DCD) instrumentation
iv © ISO 2012 – All rights reserved
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ISO 4965-2:2012(E)
Introduction
In a dynamic test, the force experienced by the test-piece may differ significantly from the intended force indicated
by the testing system. The dynamic errors result from inertial forces acting on the force transducer and any
dynamic errors in the electronics of the force indicating system. Inertial forces equate to the grip mass (interposed
between the force transducer and the test-piece) multiplied by its local acceleration, and therefore depend on
a) the amplitude of motion,b) the frequency of motion, and
c) the grip mass.
The amplitude of motion will, in turn, depend on the applied force and the mechanical configuration of the testing
system, including the compliances of the load train, the test-piece, the reaction frame, and the base mounting.
ISO 4965-1 describes two methods of determining the testing system’s performance. Both of these methods
require that the DCD instrumentation has previously been calibrated in accordance with this part of ISO 4965.
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INTERNATIONAL STANDARD ISO 4965-2:2012(E)
Metallic materials — Dynamic force calibration for uniaxial
fatigue testing —
Part 2:
Dynamic calibration device (DCD) instrumentation
1 Scope
In order to perform a dynamic calibration of a uniaxial testing system, it is necessary to measure the forces
experienced by the test-piece to known levels of accuracy – this measurement is made by a dynamic calibration
device (DCD) in place of the test-piece and the calibration method is described in ISO 4965-1. This part of
ISO 4965 defines the calibration procedure for the DCD’s instrumentation. The method for the analysis of the
results is also described, leading to a range of testing frequencies over which the instrumentation is valid for
use with DCDs in accordance with ISO 4965-1.2 Terms, definitions, and symbols
For the purposes of this document, the following terms, definitions, and symbols apply.
2.1DCD
dynamic calibration device
replica test-piece or proving device
2.2
DCD energising voltage
DC voltage used to energise the DCD’s strain gauge bridge
NOTE The DCD energising voltage is expressed in volts.
2.3
DCD instrumentation
instrumentation used in conjunction with DCD, including strain gauge bridge output conditioning electronics
and displayNOTE The DCD instrumentation may also supply the DCD energising voltage – it could then display the DCD output
as an mV/V ratio.2.4
dynamic voltage reference standard
instrument capable of generating specific sinusoidal voltage waveforms (with magnitudes proportional to either
actual or nominal DCD energising voltages) and DC voltagesNOTE 1 The dynamic voltage reference standard may be two separate pieces of equipment, one generating the DC
voltages and the other generating the sinusoidal waveforms.NOTE 2 See References [1], [2], and [3].
2.5
peak voltage value
maximum value of voltage contained within a generated or measured sinusoidal waveform
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ISO 4965-2:2012(E)
2.6
valley voltage value
minimum value of voltage contained within a generated or measured sinusoidal waveform
3 PrincipleGenerate a set of DC voltages using a dynamic voltage reference standard. Determine the difference between the
values displayed by the DCD instrumentation and the values generated by the dynamic voltage reference standard.
Similarly, generate a set of sinusoidal waveforms using the dynamic voltage reference standard in the range
from DC to the maximum test frequency, with varying amplitudes and offsets. Compare the peak and valley
voltage values displayed on the DCD instrumentation with the values generated by the dynamic voltage
reference standard.To simulate laboratory conditions, repeat the sinusoidal calibration with a known amount of harmonic distortion
to ensu...
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