bs en iso 9513-2000(calibration of extensometers in uniaxial

8/12/2019 BS en ISO 9513-2000(Calibration of Extensometers in Uniaxial

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BRITISH STANDARD

Metallic materialsration Qextensometers used inuniaxial testing

The European Standard EN IS0 9513:2002 has the status of aBritish Standard

ICs 77.040.10

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BS EN I S95 13:2002

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BS EN IS0 9513:ZOOZ

Amd. No. Date

National foreword

Comments

ThisBritish Standard havingbeen prepared under thedirection of the EngineeringSector Policy and Stra tegyCommittee was publishedunder the authority of theStandards Policy and StrategyCommittee on 9 October 2002

BSI 9 October 2002

This British Standard is th e official English lan guage version ofEN IS0 9513:2002. It is identical with IS0 9513:1999. It supersedesBS EN 10002-4:1995 which is withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeISE/NFE/4 Mechanical test ing of metals to Subcommittee ISENFEIWlUniaxial testing of metals which has the respons ibility to:

aid enquirers to understand t he text;.present to t he responsible internationallEuropean committee anyenquiries on the interpretation or proposals for change and keep theUK inter ests informed;monitor related in ternati onal and European developments an dpromulgate them in th e UK.

A list of organizations represented on thi s subcommittee can be obtained onrequest to its secretary.Cross-referencesThe British Stand ards which implement international or Europeanpublications referred to i n thi s document may be found in th e SI Catalogueunder t he section entitled International Stand ards Correspondence Index orby using t he Search facility of th e SI Electronic Catalogue or ofBritish Standard s Online.This publication does not purpo rt to include all the necessary provisions of acontract. Users a re responsible for its correct application.Compliance with a British Standard does not of itself confer immunityfrom legal obligations.

Summary of pagesThis document comprises a front cover an inside front cover th e EN IS0 titlepage th e EN IS0 foreword page the IS0 title page pages ii to iv pages o 10an inside back cover an d a back cover.The BSI copyright da te displayed in this document indicates when thedocument was last issued.

ISBN O 580 40511

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EUROPEANSTANDARDNORME EUROPENNEEUROPISCHE NORM

EN ISQ 9513September 2002

ICs 77.040.10 SupersedesEN 10002-4:1994

English versionMetallic materials calibration of extensometers used in uniaxialtesting (IS0 9513:1999)

Matriaux mtall iques- Etalonnage des extensomtresutilises lors d'essais unaxiaux (IS0 951131999)

This European Standard was approved by CENon 14 July 2002.CEN members are b u n d o comply with the CENICENELEC Internal Regulationswhich stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application o the Management Centre or to any CEN member.This European Standard exists in three off icial versions (English, French, German). A versionin any other language made by translationunder the responsibilityof a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATIONC O M I T E E U R O P E E N D E N O R M A L I S A T I O NE U R O P I S C H E S K O M I T E E F O R N O R M U N G

Management Centre: rue de Stassart, 36 6-1050 Brussels

002 CEN All rights of exploitation n any form and by any means reservedworldwide for CEN national Members. Ref. No. EN IS0 9513:2002E

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EN IS0 9513:2002

ForewordThe text of IS0 9513:1999 has been prepared by Technical Committee ISO/TC 164Mechanical testing of metals of the International Organization for Standardization (ISO) andhas been taken over as EN IS0 9513:2002 by Technical Committee ECISSTTC 1 Steels -Mechanical and physical tests , the secretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publicationof an identical ext or by endorsement, at the latest by March 2003, and conflicting nationalstandards shall be withdrawn at the latest by March 2003.This document supersedes EN 10002-4:1994.According to the CENICENELEC Internal Regulations, the national standards organizations ofthe following countries are bound to implement this European Standard: Austria, Belgium,Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnited Kingdom.

Endorsement noticeThe text of the InternationalStandard IS 0 9513:1999 has been approved by CEN as aEuropean Standard without any modifications.

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EN S0 9513:2002

INTERNATIONALSTANDARD

IS0

Second edition1999-04-15

Corrected and reprinted2001-02-01

Metallic materials alibration ofextensometers used in uniaxial testingMatriaux mtalliques talonnage des extensom tres utiliss lorsd essa is unaxiaux

Reference numberIS0 9513:1999 E)YRIGHT 2003; British Standards Institution on ERC Specs and Standards Document provided by IHS Licensee=/5943408001, User=, 10/23/2003 01:21:16 MDT


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EN IS0 9513:ZOOZ

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EN S0 9513:2002

Contents Page1Scope ........................................................................................................................................................................ 12 Symbols and designations ........................................................................................................................ ; ...........13 Principle.................................................................................................................................................................... 24 Calibration apparatus.............................................................................................................................................. 25 Procedure ................................................................................................................................................................. 25.1 Pos ition of the extensometer .............................................................................................................................. 25.2 Temperature at which the calibration is made .................................................................................................. 25.3 Accuracy of gauge length of the extensometer ................................................................................................ 25.4 Range of calibration ............................................................................................................................................. 35.5 Calibration procedure .......................................................................................................................................... 35.6 Determination of the characteristics o f the extensometer ............................................................................... 36Classification of the extensometer ........................................................................................................................ 37 Frequency of calibration ......................................................................................................................................... 48 Calibration report..................................................................................................................................................... 5Annex A (informative) Example of cal ibration ranges of an extensometer ........................................................... 6Annex B (informative) Parameters fo r classification of an extensometer ............................................................. 7Bibliography.............................................................................................................................................................. 10

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EN IS0 9613:2002

ForewordIS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0member bodies). The work of preparing International Standards is normally carried out through IS0 technicalcommittees. Each member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with EO, also take part in the work. IS0 collaborates closely with the International ElectrotechnicalCommission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.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.International Standard IS0 9513 was prepared by Technical Committee ISOTTC 164, Mechanical testing of metalsSubcommitteeSCI niaxial testing.This second edition cancels and replaces the first edition (IS0 9513:1989) which has been technically revised.This corrected and reprinted version incorporates the changes specified in IS0 9513:1999/Cor.l:2000 (E), which ishereby cancelled and replaced, together with an additional change to Table 2, row 4 column 3.Annexes A and B of this International Standard are for information only.

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EN S0 9513:ZOOZ

Metallic materials- alibration of extensometers used in uniaxialtesting1 ScopeThis International Standard specifies a method for the static calibration of extensometers used in uniaxial testing.The tem extensometer is understood to mean the displacement measuring device and the system for indicatingor recording this displacement.NOTEextensometer which have:This International Standard does not at present provide detailed guidance on the calibration of those types of

variable gauge lengths;nocontact with the test piece;full field strain measurements devices.

Special consideration should be given to such devices. These issues should be addressed at the next revision of thisInternational Standard. However some guidanceon his subject might be found in ASTM E83:1996(see Bibliography).

2 Symbols and designationsSymbols used throughout this International Standard are given in Table 1 together with their designation.

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EN IS0 9513:2002

3 PrincipieThe calibration of an extensometer involves a comparison of the readings given by the extensometer with knownvariations in length provided by a calibration apparatus.

4 Calibration apparatusThe calibration apparatus which allows a known displacement Zt, to be applied to the extensometer, may consist ofa rigid frame with suitable coaxial spindles or other fixtures to which the extensometer can be attached. Thecalibration apparatus shall comprise a mechanism for moving at least one of the axial spindles and a device foraccurately measuring the change in length produced. The variations in length can be measured, for example, usingan interferometer or gauge blocks and a comparator or a screw micrometer. The gauge blocks, comparator,micrometer or interferometer used shall be calibrated by a method which is traceable to the international unit (SI) oflength and their accuracy shall be known. The error of the calibration apparatus shall not be greater than one-thirdof the permissible error of the extensometer (see Table 2).The resolution of the calibration apparatus shall be in accordance with Table 2.

5 Procedure5.1 Position of the extensometerThe extensometer shall be placed in the calibration apparatus in the same position and orientation in which it isused during uniaxial testing so as to avoid errors due to loss of equilibrium or deformation of any part of theextensometer.The extensometer shall be attached in the same way as during uniaxial testing.5.2 Temperature at which the calibration is madeIn general, the calibration of the extensometer shall be carried out at a temperature stable to within ? 2 C ; thistemperature shall be within the range 18 C o 28 C.For extensometers used for uniaxial testing at temperatures within the range 10 C o 35 OC, t is recommended thatthe calibration be carried out at or near the test temperature, if facilities exist.The extensometer shall be placed near the calibration apparatus or mounted on it for a sufficient length of time priorto its calibration so that the parts of the extensometer and of the calibration apparatus which are in contact shallattain the calibration temperature.5.3 Accuracy of gauge length of the extensometerThe gauge length of the extensometer can be measured directly or indirectly. The following indirect method is givenas an example.The extensometer is placed on a soft metal test piece in such a way that the blades or points of the extensometerleave their marks. Once the extensometer is removed, the distance between the marks on the test piece ismeasured.The relative error on the gauge length, qLe calculated from the following formula shall not exceed the values givenin Table 2 .

Le

In the case of an extensometer having several gauge lengths, the calibration shall be carried ou? or each of thegauge lengths required by the user.

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~~ ~

EN IS0 9513:2002

For extensometers where gauge length is defined by the test piece then the gauge length of this test piece shall bemeasured to an accuracy consistent with the class of extensometer to be used.5.4 Range of calibrationThe calibration range shall be defined by the user to cover the measuring range required to determine a givenmaterial property. The maximum and minimum limitsEmaxandEmin f the calibration range shall be such that:

If several calibration ranges are specified by the user, each one shall be calibred. An example of calibration rangesis given in annex A. The ranges of calibration shall be noted in the calibration report.5.5 Calibration procedure5.5.1 When the temperature has stabilized, it is recommended that, before calibration and by means of thecalibration apparatus, the extensometer be tried for at least two lengths over the calibration range of theextensometer. If possible, the displacement is taken to a slightly negative value and returned to zero. Whereappropriate, the extensometer is reset to zero.5.5.2 The calibration consists first of one series of at least 10 measurements, I distributed approximately evenlyover the calibration range of the extensometer. The extensometer is removed and then placed back on thecalibration apparatus. A second series of measurements is then made in the same manner as the first. Dependingon the expected use of the extensometer, the two series of measurements are made for increases in length or fordecreases in length or for both.For each measurement point, calculate the relative bias error (see 5.6.2).The calibration shall be made without cleaning or lubricating any part of the extensometer. Whenever adjustementsare needed for the extensometer to comply with class requirements for its intended use, the results shall be notedafter adjustment on the calibration certificate.

5.6 Determinationof the characteristicsof the extensometer5.6.1 ResolutionThe resolution, r is the smallest quantity which can be read on the instrument. The values of the resolution of theextensometer shall be in accordance with the values given in Table 2.5.6.2 Relative bias errorThe relative bias error, q , for a given displacement, I t is calculated from the formula :

li I tq= -X I 00It

6 Classification of the extensometer

3)

Table 2 gives the maximum permissible Values for the relative gauge length error, the resolution and the relativebias error.

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EN IS0 9513:2002

Table 2 lassification of extensometers

NOTE For small gauge lengths G 25 mm and for small strains, the user should consider one of the better classes ofextensometer.a Whichever value is the greater.

7 Frequency of calibrationThe time between two calibrations depends on the type of extensometer, the maintenance standard and the numberof times the extensometer has been used. Under normal conditions, it is recommended that calibration be carriedout at intervals of approximately 12 months. This interval shall not exceed 18 months unless the test is expected tolast more than 18 months; in such case the extensometer shall be calibrated before and after the test.The extensometer shall be calibrated after each repair or adjustment of its constituent elements which could affectthe accuracy of measurements.




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EN IS0 9613:2002

8 Calibration reportThe calibration report shall contain at least the following information:a) general information:

reference to this International Standard, .e. IS0 9513;identification of the extensometer (type, gauge length, mark, serial number and mounting position);type and reference number of calibration apparatus;temperature at which the calibration was carried out;nature of variations of length for which the calibration was carried out, .e. either for increases and/or fordecreases in length;date of calibration;name or mark of the organisation which carried out the calibration;date of expiry of the calibration report.

b results of the calibration:1) class of each range of the extensometer;2) the individual values of the bias errors, if requested.



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EN IS0 9513:2002

Annex A(informative)

Example of calibration ranges of an extensometer

5% 500,5Yo

0.05irst calibration range: 0 05 o to 0,5

Second calibration range: 0,5 to 5 of the nominal value of the extensometer travelThird calibration range: 5 % to 50

FigureA.l



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EN IS 0 9513:2002

lisplacementli Itvm

111

Annex B(informative)

Straini q

0,02 x 10-3O,OI x IO-^OO x IO-^

Parameters for classification of an extensometer

)isplacement4

Pm

In order to clarify the parameters used for the classification of extensometers (see clause 6 :a) Table B.l gives three examples of calculation of these parameters;b the diagrams in Figures 8.1 and 8.2 illustrate clearly, for class 1 extensometers, how to decide which of the twolimits, relative or absolute ,should be chosen.

Strainl,ne= Et

Table B. l xamples of calculation o parameters for the classification of extensomet ers

)isplacement

vm

3ensomete rgauge length

Le

StrainlilLe =

mm

1O1O200

501O1O0

2 x 10-3x IO-^

2 x IO-^

True value

i o 11o1201

2,02 x 10-3IO x IO-^2.01 x 1 0 - ~

Measured value Absolute bias error Relative bias error a4

Displacementli - t 100

StrainEi -&,

Etx 100

a For a given displacement error, the relative error, q . is independent of the gauge length of the extensometer, Le. but is dependent onhe displacement value, I t .



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EN IS0 9513:2002

Use the absolute value,r (= 1.0 pm)

Use the resolution expressed as percentage of reading,r l i (= 0,50%)- - -

Figure B.1 esolution of a class 1 extensometer



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EN S0 9513:ZOOZ

- 7E+.

1 5vimm-.-

3

1O

- 1

-3

-5

7

Use the absolu te valuet - It ( = 13,Oprn

1O

\

Use the relative bias error, q (= 11,o %)rl

300 500 700True displacement given by the calibration apparatus t ( pm)

Figure 8.2 imits of bias error of a class 1 extensometer



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EN IS0 9513:2002

Bibliography

[I]STM E83:1996, Standard Practice for Verification and Classificationof Extensometers.




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BS EN ISQ9513:ZOOZ

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