SVENSK STANDARD SS-EN ISO 7500-1:2016

SVENSK STANDARD

Fastställd/Approved: 2016-01-12Publicerad/Published: 2016-01-28Utgåva/Edition: 3Språk/Language: engelska/EnglishICS: 19.060; 77.040.10

SS-EN ISO 7500-1:2016

Metalliska material – Kontroll av maskiner för statisk enaxlig provning – Del 1: Maskiner för dragprovning och kompressionsprovning – Kontroll och kalibrering av kraftmätningssystemet (ISO 7500-1:2015)

Metallic materials – Calibration and verification of static uniaxial testing machines – Part 1: Tension / compression testing machines – Calibration and verification of the force-measuring system (ISO 7500-1:2015)

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Europastandarden EN ISO 7500-1:2015 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av EN ISO 7500-1:2015.

Denna standard ersätter SS-EN ISO 7500-1:2004, utgåva 2 och SS-EN ISO 7500-1:2004 / AC:2009, utgåva 1.

The European Standard EN ISO 7500-1:2015 has the status of a Swedish Standard. This document contains the official English version of EN ISO 7500-1:2015.

This standard supersedes the Swedish Standard SS-EN ISO 7500-1:2004, edition 2 and SS-EN ISO 7500-1:2004 / AC:2009, edition 1.

Denna standard är framtagen av kommittén för Mekanisk provning, SIS / TK 123.

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Förhållandet till övriga delar under samma huvudtitel - Utdrag ur Förord i ISO SS-EN ISO 7500-1:2016 Relations to other parts under the same general title - Extract from the Foreword of ISO SS-EN ISO 7500-1:2016

ISO 7500 consists of the following parts, under the general title Metallic materials — Calibration and verification of static uniaxial testing machines:

- Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system

- Part 2: Tension creep testing machines — Verification of the applied force



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM

EN ISO 7500-1 December 2015

ICS 77.040.10 Supersedes EN ISO 7500-1:2004English Version Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system (ISO 7500-1:2015) Matériaux métalliques - Étalonnage et vérification des machines pour essais statiques uniaxiaux - Partie 1: Machines d'essai de traction/compression - Étalonnage et vérification du système de mesure de force (ISO 7500-1:2015)

Metallische Werkstoffe - Kalibrierung und Überprüfung von statischen einachsigen Prüfmaschinen - Teil 1: Zug- und Druckprüfmaschinen - Kalibrierung und Überprüfung der Kraftmesseinrichtung (ISO 7500-1:2015) This European Standard was approved by CEN on 21 November 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A L I S A T I O N E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7500-1:2015 E


1 Scope ................................................................................................................................................................................................................................. 12 Normative references ...................................................................................................................................................................................... 13 Terms and definitions ..................................................................................................................................................................................... 14 Symbols and their meanings .................................................................................................................................................................... 25 General inspection of the testing machine ................................................................................................................................ 36 Calibration of the force-measuring system of the testing machine ................................................................. 3

6.1 General ........................................................................................................................................................................................................... 36.2 Determination of the resolution .............................................................................................................................................. 4

6.2.1 Analogue scale ................................................................................................................................................................... 46.2.2 Digital scale........................................................................................................................................................................... 46.2.3 Variation of readings .................................................................................................................................................... 46.2.4 Unit .............................................................................................................................................................................................. 5

6.3 Prior determination of the relative resolution of the force indicator ...................................................... 56.4 Calibration procedure ....................................................................................................................................................................... 5

6.4.1 Alignment of the force-proving instrument ............................................................................................. 56.4.2 Temperature compensation ................................................................................................................................... 56.4.3 Conditioning of the testing machine and force-proving instrument .................................. 56.4.4 Procedure ............................................................................................................................................................................... 56.4.5 Application of discrete forces ............................................................................................................................... 66.4.6 Verification of accessories ....................................................................................................................................... 66.4.7 Verification of the effect of differences in piston positions ......................................................... 76.4.8 Determination of relative reversibility error .......................................................................................... 7

6.5 Assessment of the force indicator .......................................................................................................................................... 86.5.1 Relative indication error ........................................................................................................................................... 86.5.2 Relative repeatability error .................................................................................................................................... 96.5.3 Agreement between two force-proving instruments ....................................................................... 9

7 Class of testing machine range ............................................................................................................................................................... 98 Verification report ...........................................................................................................................................................................................10

8.1 General ........................................................................................................................................................................................................ 108.2 General information ........................................................................................................................................................................ 108.3 Results of verification .................................................................................................................................................................... 10

9 Intervals between verifications .........................................................................................................................................................11Annex A (normative) General inspection of the testing machine........................................................................................12Annex B (informative) Inspection of the loading platens of the compression testing machines .......13Annex C (informative) Uncertainty of the calibration results of the force-measuring system .............14Bibliography .............................................................................................................................................................................................................................18

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Contents Page

European foreword .......................................................................................................................................................ÉÖ

SS-EN ISO 7500-1:2016 (E)This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-8018310

ÉÖ

European foreword

This document (EN ISO 7500-1:2015) has been prepared by Technical Committee ISO/TC 164 "Mechanical testing of metals" in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2016, and conflicting national standards shall be withdrawn at the latest by June 2016.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 7500-1:2004.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 7500-1:2015 has been approved by CEN as EN ISO 7500-1:2015 without any modification.



Metallic materials — Calibration and verification of static uniaxial testing machines —

Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system

1 Scope

This part of ISO 7500 specifies the calibration and verification of tension/compression testing machines.

The verification consists of:

— a general inspection of the testing machine, including its accessories for the force application;

— a calibration of the force-measuring system of the testing machine;

— a confirmation that the performance properties of the testing machine achieve the limits given for a specified class.

NOTE This part of ISO 7500 addresses the static calibration and verification of the force-measuring systems. The calibration values are not necessarily valid for high-speed or dynamic testing applications. Further information regarding dynamic effects is given in the Bibliography.

CAUTION — Some of the tests specified in this part of ISO 7500 involve the use of processes which could lead to a hazardous situation.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing machines

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1calibrationoperation that establishes the relationship between the force values (with associated uncertainties) indicated by the testing machine and those measured by one or more force-proving instruments

3.2verificationconfirmation, based on analysis of measurements in accordance with this standard, that the performance properties of the testing machine achieve the limits given for a specified class

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4 Symbols and their meanings

Symbols and their meanings are given in Table 1.

Table 1 — Symbols and their meanings

Symbol Unit Meaninga % Relative resolution of the force indicator of the testing machineaF % Relative resolution of the force indicator of the testing machine at the applied forceaZ % Relative resolution of the force indicator of the testing machine at zero forceb % Relative repeatability error of the force-measuring system of the testing machine

bal % Allowable value of b for a given classΔF N Relative error of the forceΔm kg Relative error of the massΔg m/s2 Relative error of the acceleration due to gravityE % Estimated mean relative errorE’ % Estimated mean relative reversibility errorf0 % Relative zero error of the force-measuring system of the testing machineF N Reference force indicated by the force-proving instrument with increasing test

forceF’ N Reference force indicated by the force-proving instrument with decreasing test

forceFc N Reference force indicated by the force-proving instrument with increasing test

force, for the complementary series of measurements for the smallest range usedFi N Force indicated by the force indicator of the testing machine to be verified, with

increasing test force

Fi′ N Force indicated by the force indicator of the testing machine to be verified, with

decreasing test force

F Fi,N Arithmetic mean of several measurements of Fi and F for the same discrete force

Fic N Force reading on the force indicator of the testing machine to be verified, with increasing test force, for the complementary series of measurements for the smallest range used

Fi0 N Residual indication of the force indicator of the testing machine to be verified after removal of force

FN N Maximum value of the calibrated range of the force indicator of the testing machineg m/s2 Local acceleration due to gravityk Coverage factor used to calculate the expanded uncertainty from the combined

uncertaintym kg Mass of dead weights used to generate a calibration forceq % Mean relative indication error of the force-measuring system of the testing machineqi % The ith measurement of the relative indication error of the force-measuring

system of the testing machineqal % Allowable value of q for a given class

qmax % The maximum value of q at each calibration pointqmin % The minimum value of q at each calibration pointqT1 % Relative indication error determined at a crossover point using force-proving

instrument 1

2


Symbol Unit MeaningqT2 % Relative indication error determined at a crossover point using force-proving

instrument 2r N Resolution of the force indicator of the testing machine

uc % Combined uncertaintyui % Uncertainty component

urep % Uncertainty component due to repeatabilityures % Uncertainty component due to resolutionustd % Uncertainty component due to the calibration standard used

U % Expanded uncertaintyU’ % Expanded reversibility uncertainty

UT1 % Expanded uncertainty using force-proving instrument 1 at a crossover pointUT2 % Expanded uncertainty using force-proving instrument 2 at a crossover point

v % Relative reversibility error of the force-measuring system of the testing machineρair kg/m3 Density of airρm kg/m3 Density of the dead weights

5 General inspection of the testing machine

The calibration of the testing machine shall only be carried out if the machine is in good working order. For this purpose, a general inspection of the machine shall be carried out before calibration of the force-measuring system of the machine (see Annex A).

NOTE Good metrological practice requires a calibration run prior to any maintenance or adjustments to the testing machine to determine the “as found” condition of the machine.

Information on the inspection of the loading platens is provided in Annex B. Uncertainty of the calibration results is discussed in Annex C.

6 Calibration of the force-measuring system of the testing machine

6.1 General

This calibration shall be carried out for each of the force ranges used and with all force indicators in use. Any accessory devices (e.g. pointer, recorder) that may affect the force-measuring system shall, where used, be verified in accordance with 6.4.6.

If the testing machine has several force-measuring systems, each system shall be regarded as a separate testing machine. The same procedure shall be followed for double-piston hydraulic machines.

The calibration shall be carried out using force-proving instruments with the following exception; if the force to be verified is below the lower limit of the smallest capacity force-proving device used in the calibration procedure, use known masses.

When more than one force-proving instrument is required to calibrate a force range, the maximum force applied to the smaller device shall be the same as the minimum force applied to the next force-proving instrument of higher capacity. When a set of known masses is used to verify forces, the set shall be considered as a single force-proving instrument.

Table 1 (continued)

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SVENSK STANDARD SS-EN ISO 7500-1:2016