BS ISO 17340-2014 Metallic materials Ductility testing High speed compression test for porous and cellular metals《金属材料 延性试验 多孔及蜂窝状金属的高速压缩试验》.pdf

1、BSI Standards PublicationBS ISO 17340:2014Metallic materials Ductilitytesting High speedcompression test for porousand cellular metalsBS ISO 17340:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 17340:2014.The UK participation in its preparation was entrus

2、ted to TechnicalCommittee ISE/101/2, Ductility testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The Britis

3、h Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 76905 4ICS 77.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2014.

4、Amendments issued since publicationDate Text affectedBS ISO 17340:2014 ISO 2014Metallic materials Ductility testing High speed compression test for porous and cellular metalsMatriaux mtalliques Essais de ductilit Essai de compression haute vitesse des mtaux poreux et cellulairesINTERNATIONAL STANDAR

5、DISO17340First edition2014-05-01Reference numberISO 17340:2014(E)BS ISO 17340:2014ISO 17340:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or b

6、y any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211

7、 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 17340:2014ISO 17340:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Tes

8、ting machine 25.1 Type of testing machine 25.2 Drop weight impact testing machine . 25.3 Servo-type high-speed compression testing machine 46 Test piece 46.1 Preparation of test piece . 46.2 Shape and dimensions of the test piece 57 Drop weight impact test 67.1 Preparation 67.2 Test 88 Servo-type hi

9、gh-speed compression test 88.1 Preparation 88.2 Test 89 Calculations 99.1 Compressive strain 99.2 Compressive stress 99.3 Compressive stress-strain curve 99.4 Plateau stress (pl) 99.5 Plateau end . 99.6 Plateau end strain (eple) .109.7 Energy absorption. 1010 Test report 12Annex A (informative) Filt

10、ering of the measurement data 13Bibliography .16BS ISO 17340:2014ISO 17340:2014(E)ForewordISO (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

11、 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 collaborate

12、s closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval crit

13、eria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject o

14、f patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade nam

15、e used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technica

16、l Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee SC 2, Ductility testing.iv ISO 2014 All rights reservedBS ISO 17340:2014ISO 17340:2014(E)IntroductionPorous and c

17、ellular metals have attractive properties due to their unique cell morphology. When they are used as impact energy absorbing components in automotive structures, knowledge of their high-speed compressive properties is necessary for industrial design. The high-speed compressive deformation behaviour

18、of porous and cellular metals is quite different from their static compressive properties. Testing methods for static compressive deformation are, therefore, insufficient for characterization of high-speed compressive deformation. Standardization of a testing method for the high-speed compressive be

19、haviour of porous and cellular metals is required. ISO 2014 All rights reserved vBS ISO 17340:2014BS ISO 17340:2014Metallic materials Ductility testing High speed compression test for porous and cellular metals1 ScopeThis International Standard specifies methods for high speed compression testing, a

20、t room temperature, of porous and cellular metals having a porosity of 50 % or more. The speed range applicable to this test method is 0,1 m/s to 100 m/s (or 1 s1to 103s1in terms of the initial strain rate when the specimen height is 100 mm).2 Normative referencesThe following documents, in whole or

21、 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 f

22、orce-proving instruments used for the verification of uniaxial testing machinesISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring systemISO 13314, Mechanical testing of metal

23、s Ductility testing Compression test for porous and cellular metalsISO 80000-1, Quantities and units Part 1: General3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 13314 and the following apply.3.1test speedmovement speed of the pressing jig, which ap

24、plies the compressive force to the test piece, when the pressing jig contacts the test piece3.2initial strain ratevalue derived by dividing the test speed by the initial height of the test piece3.3sampling frequencyfrequency used to sample the measurement data per unit time3.4drop heightinitial dist

25、ance between the pressure application plane of the pressing jig and the top surface of the test piece in the drop weight impact testing machine3.5approach lengthinitial distance between the pressure application plane of the pressing jig and the top surface of the test piece in the servo-type high-sp

26、eed compression testing machineINTERNATIONAL STANDARD ISO 17340:2014(E) ISO 2014 All rights reserved 1BS ISO 17340:2014ISO 17340:2014(E)4 PrincipleThis test consists of applying an impact force at test speeds between 0,1 m/s and 100 m/s to porous and cellular metals and measuring the compressive for

27、ce and displacement for evaluation of their high-speed compressive deformation characteristics, such as plateau stress and energy absorption. Test methods that apply high-speed compressive forces to porous and cellular metals are the drop weight impact test and the servo-type high-speed compression

28、test.The drop weight impact test applies the compressive force by dropping a weight from a specified height. The test speed is controlled by the drop height. Due attention should be paid to the fact that the weight will be decelerated during the period of compressive deformation. When the drop heigh

29、t necessary to reach the specified test speed cannot be obtained, application of an initial velocity to the weight is possible.The servo-type high-speed compression test applies the compressive force using a hydraulic or electric high-speed servo mechanism. The test speed is changed by the servo con

30、trol. The drive unit shall be capable of following the test speed.5 Testing machine5.1 Type of testing machineThe testing machines to be used for high-speed compression testing of porous and cellular metals are the drop weight impact testing machine and the servo-type high speed compression testing

31、machine.5.2 Drop weight impact testing machine5.2.1 GeneralAn example of the basic composition of the drop weight impact testing machine is shown in Figure 1.The drop weight impact testing machine consists of a weight, guide frame, pressing jig, load cell, displacement sensor, and absorber, as descr

32、ibed below.5.2.2 WeightThe weight shall drop vertically along the guide frame and shall be capable of applying the compressive force to the test piece.The weight shall not be deformed by the impact when dropped and it should be possible to change the mass freely.5.2.3 Pressing jigThe pressing jigs a

33、re located above and below the test piece and are used to apply the compressive force to the test piece. The pressing jig shall be of a construction such that it does not deform due to the compressive force, allowing correct transmission of the compressive force in the axial direction and preventing

34、 the action of forces, such as bending stress, etc., other than the compressive force on the test piece.The area of the pressing surfaces shall be sufficiently large to ensure an even application of the compressive force over the entire end surface of the test piece until compressive deformation is

35、complete.The pressing surfaces shall be polished flat and installed in such a manner that the centre of the planes is aligned with the centre line of the testing machine and the planes are parallel to each other.2 ISO 2014 All rights reservedBS ISO 17340:2014ISO 17340:2014(E)5.2.4 Load cellThe load

36、cell shall be capable of measuring the compressive force acting on the test piece. For calibration of the load cell, ISO 376 shall be taken into consideration.The resonant frequency and stiffness of the load cell shall be sufficiently high and the compressive force shall be measured to an accuracy o

37、f 1 %.123526748Key1 weight2 pressing jig3 drop height4 displacement sensor5 test piece6 load cell7 absorber8 guide frameFigure 1 Schematic of a drop weight impact testing machine ISO 2014 All rights reserved 3BS ISO 17340:2014ISO 17340:2014(E)5.2.5 Displacement sensorThe displacement sensor shall be

38、 capable of measuring the travel of a drop weight during tests and shall be of a non-contact type to avoid inertia effects.The response speed of the displacement sensor shall be higher than the test speed. Measurement with laser-type displacement sensors, optical displacement sensors, etc. with high

39、 accuracy is recommended.5.2.6 AbsorberThe absorber shall be capable of stopping the weight and preventing it from damaging the load cell after compressing the test piece to the specified height.5.3 Servo-type high-speed compression testing machine5.3.1 GeneralAmong servo-type high-speed compression

40、 testing machines, the basic composition of the servo-hydraulic-type high-speed compression testing machine is shown in Figure 2.The servo-type high-speed compression testing machine consists of a pressing jig, load cell, displacement sensor, rupture pin, and stopper, as described below.5.3.2 Pressi

41、ng jigThe pressing jig shall be the same as described in 5.2.3.5.3.3 Load cellThe load cell shall be the same as described in 5.2.4.5.3.4 Displacement sensorThe displacement sensor shall be the same as described in 5.2.5.5.3.5 Rupture pinThe rupture pin is a test force transmission part provided to

42、protect the load cell and the pressing jig from damage resulting from excessively large compressive forces.The material and the size of the rupture pin shall be capable of resisting the required test force adequately and of breaking, without large plastic deformation, below the load capacity of the

43、load cell and the pressing jig.5.3.6 StopperThe stopper shall be provided between pressing jigs and shall be capable of stopping the movement of the pressing jigs after having deformed the test piece to the specified height.6 Test piece6.1 Preparation of test pieceThe test piece shall be prepared by

44、 machining, electro-discharge machining, etc., as specified in ISO 13314.4 ISO 2014 All rights reservedBS ISO 17340:2014ISO 17340:2014(E)Cutting into test pieces shall be executed with the utmost care so as not to alter the cellular structure or pore shape of the porous and cellular metals.4552361Ke

45、y1 rupture pin2 load cell3 test piece4 displacement sensor5 pressing jig6 stopperFigure 2 Schematic of a servo-hydraulic type high-speed compression testing machine6.2 Shape and dimensions of the test pieceThe shape and dimensions of the test piece shall be as described below.a) The shape of the tes

46、t piece shall be a square prism, a rectangular prism, or a column.b) The length of the shorter side or diameter of the test piece shall be no less than 10 times the average pore size.c) The average pore size shall be measured in the cut section.d) The initial height of the test piece, H0, shall be b

47、etween one and two times the diameter or length of the shorter side of the test piece. In the case of the drop weight impact test, however, the initial ISO 2014 All rights reserved 5BS ISO 17340:2014ISO 17340:2014(E)height of the test piece shall be more than two times the test piece height, H1, at

48、a time when the weight contacts the absorber, as shown in Figure 3.e) The shape and size of the test piece used for the preliminary test of the drop weight impact test shall be as specified in ISO 13314 regardless of items a) to d) above.1234H1H0Key1 test piece2 absorber3 pressing jig4 load cellFigu

49、re 3 Relation between the initial height of the test piece and that of the absorber in a drop weight impact test7 Drop weight impact test7.1 PreparationThe drop weight impact test shall be prepared as follows.a) Preliminary testFor the preliminary test, the compression test in accordance with ISO 13314 shall be executed using a test piece of the same material, so as to determine the mass of the weight before starting the main test.The preliminary test shall be made once or more to measure the energy absorptio