BS EN ISO 26203-2-2011 Metallic materials Tensile testing at high strain rates Servo-hydraulic and other test systems《金属材料 高应力率拉力试验 伺服液压和其它试验系统》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 26203-2:2011Metallic materials Tensiletesting at high strain ratesPart 2: Servo-hydraulic and other testsystems (ISO 26203-2:2011)Copyright European Committee for Stand

2、ardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 26203-2:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 26203-2:2011. The UK participation in its preparation w

3、as entrusted to T e c h n i c a l C o m m i t t e e I S E / 1 0 1 / 1 , U n i a x i a l t e s t i n g .A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are

4、responsible for its correct application. The British Standards Institution 2012 ISBN 978 0 580 63277 8 ICS 77.040.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee

5、 on 31 January 2012.Amendments issued since publicationDate T e x t a f f e c t e dCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NO

6、RM EN ISO 26203-2 October 2011 ICS 77.040.10 English Version Metallic materials - Tensile testing at high strain rates - Part 2: Servo-hydraulic and other test systems (ISO 26203-2:2011) Matriaux mtalliques - Essai de traction vitesses de dformation leves - Partie 2: Systmes dessai servo-hydraulique

7、s et autres systmes dessai (ISO 26203-2:2011) Metallische Werkstoffe - Zugversuch bei hohen Dehngeschwindigkeiten - Teil 2: Servohydraulische und andere Systeme (ISO 26203-2:2011) This European Standard was approved by CEN on 17 September 2011. CEN members are bound to comply with the CEN/CENELEC In

8、ternal 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 a

9、ny 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

10、versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia

11、, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for

12、 CEN national Members. Ref. No. EN ISO 26203-2:2011: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 26203-2:2011 EN ISO 26203-2:2011 (E) 3 Foreword This document (EN

13、ISO 26203-2:2011) 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 sta

14、tus of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2012, and conflicting national standards shall be withdrawn at the latest by April 2012. Attention is drawn to the possibility that some of the elements of this document may be the subjec

15、t of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulg

16、aria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice

17、 The text of ISO 26203-2:2011 has been approved by CEN as a EN ISO 26203-2:2011 without any modification. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 26203-2:2011IS

18、O 26203-2:2011(E) ISO 2011 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references .13 Terms and definitions .14 Symbols .15 Principle .36 Apparatus 37 Test pieces 37.1 Test piece geometry 37.2 Preparation of test pieces .48 Procedure and measurements .58.1 Veloc

19、ity selection 58.2 Force measurement 58.3 Extension measurement 68.4 Data acquisition .69 Evaluation of tests 69.1 Stress-strain curve 69.2 Determination of key values .79.3 Strain rates 89.4 Determination of flow curves .810 Test report .9Annex A (informative) Testing equipment 10Annex B (informati

20、ve) Examples of test piece geometries .12Annex C (informative) Example of an engineering stress-strain curve .14Bibliography .15Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS

21、 EN ISO 26203-2:2011ForewordISO (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 su

22、bject 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 (

23、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 committ

24、ees 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 h

25、eld responsible for identifying any or all such patent rights.ISO 26203-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 1, Uniaxial testing.ISO 26203 consists of the following parts, under the general title Metallic materials Tensile testing at high st

26、rain rates: Part 1: Elastic-bar-type systems Part 2: Servo-hydraulic and other test systemsISO 26203-2:2011(E)iv ISO 2011 All rights reservedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license fr

27、om IHS-,-,-BS EN ISO 26203-2:2011IntroductionThe deformation behaviour of many technical materials shows a positive strain-rate effect up to ductile failure, i.e. with increasing strain rate, an increase of yield stress and strain to failure can be observed. This information is of great importance f

28、or the reliable assessment of crashworthiness of automobile structures, which is increasingly determined by numerical methods to minimize the need for cost-intensive and time-consuming crash tests. For the numerical simulation of crash-type loads, stress-strain curves determined at higher strain rat

29、es are required. The quasi-static values determined according to ISO 6892-1, i.e. strain rates lower than or equal to 0,008 s1,are not suitable for the description of the behaviour of the material of a component under dynamic load, i.e. at strain rates higher than those in quasi-static tests.ISO 262

30、03-2:2011(E) ISO 2011 All rights reserved vCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 26203-2:2011Copyright European Committee for Standardization Provided by IHS

31、under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 26203-2:2011INTERNATIONAL STANDARD ISO 26203-2:2011(E)Metallic materials Tensile testing at high strain rates Part 2:Servo-hydraulic and other test systems1 ScopeThis part of ISO 26203

32、gives requirements for the testing of metallic materials. Only examples for testing flat geometries are given; however, other geometries can be tested. The area of application spans a range of strain rates from 102s1to 103s1. Tests are carried out between 10 C and 35 C and, unless otherwise specifie

33、d, using a servo-hydraulic-type test system.NOTE 1 Measurements at strain rates lower than 102s1can be performed using machines designed for quasi-static testing.NOTE 2 For test piece geometries other than those shown in 7.1 and Annex B, see ESIS P7 (Reference 1) and FAT Guideline (Reference 2).2 No

34、rmative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6892-1, Metallic materials T

35、ensile testing Part 1: Method of test at room temperature3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 6892-1 apply.4 SymbolsFor the purposes of this document, the symbols given in ISO 6892-1 apply. Additional symbols, units and descriptions are pro

36、vided in Table 1.Table 1 SymbolsSymbol Unit DescriptionTest pieceaomm Original thickness of a flat test piecebomm Original width of the parallel length of a flat test piecebkmm Width(s) of the clamping area of the test pieceLomm Original gauge lengthLcmm Parallel lengthLemm Extensometer gauge length

37、r mm Transition radiusSomm2Original cross-sectional area of the parallel lengthSDmm2Dynamometer area: area on the fixed side of the test piece where only elastic deformations are required during the test ISO 2011 All rights reserved 1Copyright European Committee for Standardization Provided by IHS u

38、nder license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 26203-2:2011Symbol Unit DescriptionTimet s Timetfs Duration from beginning of test to moment of fracture initiationElongationA % Percentage elongation after fractureNOTE For non-proporti

39、onal test pieces, the symbol A is supplemented by a subscript, which shows the original gauge length, in millimetres, e.g. A20 mm= percentage elongation after fracture with an original gauge length Lo= 20 mm.ExtensionAg% Percentage plastic extension at maximum force, Fm(plastic strain at maximum for

40、ce, Fm)Agt% Percentage total extension at maximum force, Fm(total strain at maximum force, Fm)Straine(t) % Time-dependent engineering strainepl% Plastic engineering strainet% Total engineering strainplTrue plastic straintTrue total strainRatesvomm s1Initial displacement rateenoms1Nominal engineering

41、 strain rate = vo /LcEquation (1)emeans1Mean engineering strain rate = A/tfEquation (4)e t( ) s1Time-dependent engineering strain rate = de(t)/dtepls1Mean value of the time-dependent engineering strain rate: de(t)/dt in the range between start of yield or 1 % strain and strain at maximum force Equat

42、ion (5)fuHz Upper frequency limit of the relevant measuring system (force or extension)ForceFmN Maximum forceEngineering stress True stressR MPaaEngineering stress MPa True stressYield strength Proof strength Tensile strengthReLMPa Lower yield strengthRpMPa Proof strength, plastic extensionRmMPa Ten

43、sile strengthModulus of elasticity Slope of stress-strain curveE MPa Modulus of elasticitymEMPa Slope of the elastic part of the stress-strain curveba1 MPa = 1 N/mm2.bIn the elastic part of the stress-strain curve the value of the slope can closely agree with the value of the modulus of elasticity i

44、f optimal conditions (high resolution, double-sided averaging extensometers, proper alignment of the test piece, etc.) are used.ISO 26203-2:2011(E)Table 1 (continued)2 ISO 2011 All rights reservedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo

45、reproduction or networking permitted without license from IHS-,-,-BS EN ISO 26203-2:20115 PrincipleThe stress-strain characteristics of metallic materials at specific plastic strain rates are determined.To perform tension tests at strain rates above those described in ISO 6892-1, the measurement of

46、force and elongation of the original gauge length, Lo, shall meet additional requirements in order to obtain reliable high-rate stress-strain curves. This part of ISO 26203 describes the requirements for determining and evaluating the stress and strain in force equilibrium during plastic deformation

47、 at strain rates up to 103s1.6 ApparatusTesting machines in conformity with this part of ISO 26203 work on the principle that the kinetic energy required for the test is applied on the impact (or loading) side of the test piece (see Figure A.1). The load cell is located at the opposite end of the te

48、st piece, which is fixed or restrained in a clamp/grip (see Figure A.1). Loading at high strain rates is preferably impact-like and, therefore, often does not allow a fixed coupling of the test piece to the testing machine. All testing machines that permit a constant strain rate (within certain bounds; see 9.3) during the entire test are suitable for testing.The most common high-rate testing machine applicable to this part of ISO 26203 utilizes a servo-hydraulic drive fitted with a slack adapter (see Referenc