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

Status
Published
Publication Date
05-Jul-2012
Current Stage
9093 - International Standard confirmed
Start Date
08-Dec-2017
Completion Date
08-Dec-2017
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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
---------------------- Page: 1 ----------------------
ISO 4965-2:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s

member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
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E-mail copyright@iso.org
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Published in Switzerland
ii © ISO 2012 – All rights reserved
---------------------- Page: 2 ----------------------
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

© ISO 2012 – All rights reserved iii
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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
---------------------- Page: 4 ----------------------
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.

© ISO 2012 – All rights reserved v
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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.

2.1
DCD
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 display

NOTE 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 voltages

NOTE 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

© ISO 2012 – All rights reserved 1
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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 Principle

Generate 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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