EN 13087-5-2012 en Protective helmets - Test methods - Part 5 Retention system strength《防护头盔 试验方法 第5部分 保持系统强度》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 13087-5:2012Protective helmets TestmethodsPart 5: Retention system strengthBS EN 13087-5:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementatio

2、n of EN 13087-5:2012.It supersedes BS EN 13087-5:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PH/6, Head protection.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purpor

3、t to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 68427 2ICS 13.340.20Compliance with a British Standard cannot confer immunity fromlegal obligations.T

4、his British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 2012.Amendments issued since publicationDate Text affectedBS EN 13087-5:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13087-5 February 2012 ICS 13.340.20 Supersedes EN 13087

5、-5:2000English Version Protective helmets - Test methods - Part 5: Retention system strength Casques de protection - Mthodes dessai - Partie 5: Rsistance du systme de rtention Schutzhelme - Prfverfahren - Teil 5: Festigkeit des Haltesystems This European Standard was approved by CEN on 17 December 2

6、011. 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

7、 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-CE

8、NELEC 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Mal

9、ta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights

10、 of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13087-5:2012: EBS EN 13087-5:2012EN 13087-5:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and definitions .54 Prerequisites 55 Methods 55.1 General 55.2

11、 Headform support, increasing load method .65.2.1 Principle 65.2.2 Apparatus .65.2.3 Procedure .75.2.4 Test report 75.3 Hook support, dynamic load method 75.3.1 Principle 75.3.2 Apparatus .75.3.3 Procedure .85.3.4 Test report 95.4 Headform support, dynamic load method 95.4.1 Principle 95.4.2 Apparat

12、us .95.4.3 Procedure 105.4.4 Test report . 10Annex A (normative) Test results Uncertainty of measurement 15Annex B (informative) Significant technical changes between this European Standard and EN 13087-5:2000 16Annex ZA (informative) Relationship between this European Standard and the Essential Req

13、uirements of EU Directive 89/686/EEC Personal Protective Equipment 17BS EN 13087-5:2012EN 13087-5:2012 (E) 3 Foreword This document (EN 13087-5:2012) has been prepared by Technical Committee CEN/TC 158 “Head protection”, the secretariat of which is held by BSI. This European Standard shall be given

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

15、he 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 13087-5:2000. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and

16、supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. Annex B provides details of significant technical changes between this European Standard and the previous edition. This European Standard c

17、onsists of the following ten parts: Part 1 : Conditions and conditioning; Part 2 : Shock absorption; Part 3 : Resistance to penetration; Part 4 : Retention system effectiveness; Part 5 : Retention system strength; Part 6 : Field of vision; Part 7 : Flame resistance; Part 8 : Electrical properties; P

18、art 9 : Mechanical rigidity1; Part 10 : Resistance to radiant heat. 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,

19、Estonia, Finland, 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. 1To be published. BS EN 13087-5:2012EN 13087-5:2012 (E) 4

20、Introduction This European Standard is intended as a supplement to the specific product standards for protective helmets (helmet standards). This method or other test methods may be applicable to specified for complete helmets or parts thereof, and may be referenced in the appropriate helmet standar

21、ds. Performance requirements are given in the appropriate helmet standard, as are such prerequisites as the number of samples, preconditioning, preparation of samples for the tests, sequence and duration of testing and assessment of test results. If deviations from the test method given in this stan

22、dard are necessary, these deviations will be specified in the appropriate helmet standard. BS EN 13087-5:2012EN 13087-5:2012 (E) 5 1 Scope This European Standard specifies methods of test for protective helmets. The purpose of these tests is to enable assessment of the performance of the helmet as s

23、pecified in the appropriate helmet standard. This European Standard specifies the method of test for retention system strength. 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 refere

24、nces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 960:2006, Headforms for use in the testing of protective helmets EN 13087-1, Protective helmets Test methods Part 1: Conditions and conditioning 3 Terms

25、and definitions For the purposes of this document, terms and definitions given in this standard may be found in the appropriate helmet standard. 4 Prerequisites In order to implement this part of EN 13087, at least the following parameters shall be specified in the appropriate helmet standard: a) pe

26、rformance requirements; b) number of samples; c) preparation of samples; d) sequence of conditioning; e) sequence of tests; f) method of test - 5.2 (including 5.2.3.1 or 5.2.3.2), 5.3 or 5.4, and the initial and intermediate forces; g) sizes of the headforms; h) impact energy, including tolerance, o

27、f the falling mass - methods 5.3 and 5.4; i) fitting instructions. 5 Methods 5.1 General Testing shall be performed in ambient conditions specified in EN 13087-1. Three test methods are specified. The method to be used is specified in the helmet standard. BS EN 13087-5:2012EN 13087-5:2012 (E) 6 5.2

28、Headform support, increasing load method 5.2.1 Principle The helmet is supported on a headform and a specified, varying force is applied to the retention system via an artificial jaw. In method (a) (see 5.2.3.1) the ultimate tensile strength of the system alone is measured. In method (b) (see 5.2.3.

29、2) the elongation of the system is measured as well. 5.2.2 Apparatus 5.2.2.1 General The apparatus shall include: a series of headforms; a rigid structure to support the headforms; an artificial jaw; a means of applying a variable tensile force to the artificial jaw; a means to measure the displacem

30、ent of the artificial jaw. An arrangement of a suitable apparatus is shown in Figure 1. 5.2.2.2 Test headforms Headforms, conforming to EN 960:2006, 2.2, 3.1.2 and 3.2. The sizes to be used are specified in the helmet standard, but shall be selected from size designations 495, 535, 575, 605 and 625

31、(equivalent to codes A, E, J, M and O, respectively, EN 960:1994). 5.2.2.3 Rigid structure Rigid structure, capable of supporting the headform so that it does not move during the test. 5.2.2.4 Artificial jaw Artificial jaw, comprising two rigid cylindrical rollers of diameter (12,5 0,5) mm, with the

32、ir longitudinal axes separated by (75 2) mm. 5.2.2.5 Means of applying a known variable force to the artificial jaw Any suitable means may be used. 5.2.2.6 Means to measure the displacement of the artificial jaw Any suitable means may be used. BS EN 13087-5:2012EN 13087-5:2012 (E) 7 5.2.3 Procedure

33、5.2.3.1 Method (a) Mount the helmet on the appropriate headform, pass the chinstrap through and secure it around the artificial jaw. Apply the initial tensile force as specified in the appropriate helmet standard to the artificial jaw. Increase the force at a rate of (20 2) N/min until the artificia

34、l jaw is released due to failure of the retention system. Record the maximum force measured during the test and the mode of failure of the retention system. 5.2.3.2 Method (b) Mount the helmet on the appropriate headform, pass the chinstrap through and secure it around the artificial jaw. Apply the

35、initial tensile force as specified in the appropriate helmet standard in order to ensure that the fastening device is correctly tightened. Note the position, P0, of the load bearing spindle to the nearest millimetre. Increase the force over a period of (30 3) s up to the intermediate force specified

36、 in the appropriate helmet standard. Maintain this force for (120 3) s, then note the position, P1, of the load bearing spindle to the nearest millimetre, and, if required by the appropriate helmet standard, re-measure the width of the chinstrap. Increase the force at a rate of (500 50) N/min until

37、the artificial jaw is released due to failure of the retention system. Record the maximum force measured during the test and the mode of failure of the retention system. 5.2.4 Test report Method (a) Report the maximum force measured during the test and the mode of failure of the retention system. Me

38、thod (b) Calculate and report the elongation of the retention system as the difference between positions P0and P1. Report the maximum force measured during the test and the mode of failure of the retention system, and, if required, the width of the chinstrap. 5.3 Hook support, dynamic load method 5.

39、3.1 Principle The helmet, including retention system, is fitted to a headform which is then subjected to a sudden downward force. The maximum and residual displacements of the headform are measured. 5.3.2 Apparatus 5.3.2.1 General The apparatus shall include: a series of headforms; a helmet support

40、hook assembly; BS EN 13087-5:2012EN 13087-5:2012 (E) 8 a rigid structure to support the helmet and loading system; a falling mass and associated guidance system; a means to measure impact speed; a means to measure the position and displacement of the headform in a vertical direction. An arrangement

41、of a suitable apparatus is shown in Figure 2. 5.3.2.2 Test headforms The headforms shall comply with EN 960:2006, 2.2, 3.1.2 and 3.2. The sizes to be used are specified in the helmet standard, but shall be selected from size designations 495, 515, 535, 555, 575, 585, 605 and 625 (equivalent to codes

42、 A, C, E, G, J, K, M and O, respectively, EN 960:1994). Each headform, together with the parts attached to it, shall have a total mass of (15 0,5) kg. 5.3.2.3 Helmet support hook assembly The helmet support hook assembly shall be made from steel and is shown in Figure 3. 5.3.2.4 Rigid structure The

43、rigid structure shall adequately support the helmet and loading system during the test. 5.3.2.5 Falling mass and guidance system A guidance system shall be provided to enable the falling mass of (10 0,1) kg to be dropped in guided fall on to the metal end stop. The guidance system shall be such as t

44、o ensure that the falling mass falls with an impact speed of no less than 95 % of that which would theoretically obtain for a free fall. 5.3.2.6 Means to measure impact speed Means shall be provided to measure the speed of the falling mass at a distance of no more than 60 mm prior to impact, to with

45、in an accuracy of 1 %. The impact speed shall be measured during the commissioning of the apparatus. It need not be done for each test. 5.3.2.7 Means to observe the position and displacement of the headform in a vertical direction Any suitable means may be used. 5.3.3 Procedure Support the helmet fr

46、om the rigid structure by means of the helmet support hook passing through a suitable hole drilled through the point of the helmet which corresponds with the central vertical axis of the headform. Insert the headform into the helmet and locate the guide so that the falling mass is free to move only

47、along a vertical line that passes through the point at which the helmet is supported. Fasten the retention system in accordance with the fitting instructions. BS EN 13087-5:2012EN 13087-5:2012 (E) 9 Measure to the nearest millimetre the vertical position of the point of application of the force with

48、out the falling mass resting on the system. Allow the mass to fall on to the anvil through the required height to give the impact energy specified in the helmet standard. Measure to the nearest millimetre the maximum dynamic displacement of the point of application of the force. At between 115 s and

49、 125 s after the test, measure to the nearest millimetre the residual displacement of the point of application of the force whilst the falling mass is resting on the anvil. If specified in the helmet standard, ascertain whether the retention system can be released using only one hand whilst the falling mass is resting on the anvil. 5.3.4 Test report Report the maximum dynamic displacement and the residual displacement of the point of ap