BS ISO 8513-2016 Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes Test methods for the determination of the initial longitudinal tensile strength《塑料管系统 玻.pdf

1、BSI Standards PublicationBS ISO 8513:2016Plastics piping systems Glass-reinforced thermosettingplastics (GRP) pipes Testmethods for the determinationof the initial longitudinaltensile strengthBS ISO 8513:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 8513

2、:2016. It supersedes BS ISO 8513:2014 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/88/2, Plastics piping for pressure applications.A list of organizations represented on this committee can be obtained on request to its secretary.This publicatio

3、n does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 87693 6 ICS 23.040.20 Compliance with a British Standard cannot confer immunity fr

4、om legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 8513:2016 ISO 2016Plastics piping systems Glass-reinforced thermosetting pl

5、astics (GRP) pipes Test methods for the determination of the initial longitudinal tensile strengthSystmes de canalisations en plastiques Tubes en plastiques thermodurcissables renforcs de verre (PRV) Mthodes dessai pour la dtermination de la force en traction longitudinaleINTERNATIONAL STANDARDISO85

6、13Third edition2016-02-01Reference numberISO 8513:2016(E)BS ISO 8513:2016ISO 8513:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise

7、in any form or by 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 officeCh. de

8、Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 8513:2016ISO 8513:2016(E)Foreword ivIntroduction v1 Scope . 12 Terms and definitions . 13 Principle 24 Apparatus . 35 Test pieces . 35.1 General . 35.2 Strip test piece (

9、method A) 45.2.1 Shape 45.2.2 Dimensions . 45.2.3 Use of built-up ends 65.3 Pipe section test pieces (method B) . 65.4 Number of test pieces . 66 Conditioning 67 Test temperature 68 Procedure (methods A and B) 79 Calculation 79.1 For strip test pieces (method A) 79.2 For pipe test pieces (method B)

10、. 710 Test report . 8Annex A (informative) Determination of longitudinal properties for helically filament-wound thin wall pipe 9Bibliography .11 ISO 2016 All rights reserved iiiContents PageBS ISO 8513:2016ISO 8513:2016(E)ForewordISO (the International Organization for Standardization) is a worldwi

11、de 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 subject for which a technical committee has been established has the right to be represented on tha

12、t 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 (IEC) on all matters of electrotechnical standardization.The procedures used to develop this docum

13、ent and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria 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 Directive

14、s, 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 of 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

15、 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 name 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 specifi

16、c terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.The committee responsible for this document is ISO/TC 138, Plastics pipes,

17、fittings and valves for the transport of fluids, Subcommittee SC 6, Reinforced plastics pipes and fittings for all applications.This third edition cancels and replaces the second edition (ISO 8513:2014) which has been technically revised.iv ISO 2016 All rights reservedBS ISO 8513:2016ISO 8513:2016(E

18、)IntroductionAlthough this International Standard was revised in 2014, it was found necessary to again revise to correct several small errors in presentation and to revise the allowable testing speed (crosshead movement) range. A review of ISO testing standards for glass-reinforced thermosetting pla

19、stics (GRP) materials and the results of a recent testing program indicated that a testing speed of 2 mm/min to 5 mm/min is more appropriate. Also, evidence was presented that method C, the plate method, lead to results that were frequently from shear failures rather than tensile failures and lead t

20、o a falsely high prediction of Longitudinal Tensile Strength. Method C has been removed from this edition. Also, the term “Apparent” was removed from the title as it seemed to have no clear meaning. ISO 2016 All rights reserved vBS ISO 8513:2016BS ISO 8513:2016Plastics piping systems Glass-reinforce

21、d thermosetting plastics (GRP) pipes Test methods for the determination of the initial longitudinal tensile strength1 ScopeThis International Standard specifies two test methods for determining the longitudinal tensile properties of glass-reinforced thermosetting plastics (GRP) pipes. The properties

22、 which can be determined are the longitudinal tensile strength, and the percentage ultimate elongation.Method A uses, for the test piece(s), a longitudinal strip cut from a pipe.Method B uses a specified length of the full cross-section of the pipe.Method A is applicable to pipes with a nominal size

23、 of DN 50 or greater with circumferentially wound filaments, with or without chopped glass and/or woven rovings and/or fillers, and to centrifugally cast pipes. It is applicable to pipes with helically wound filaments with a nominal size of DN 200 or greater.Method B is applicable to all types of GR

24、P pipe. It is usually used for pipes with a nominal size up to and including DN 150.Results from one method are not necessarily equal to the results derived from any of the alternative methods. However, all methods have equal validity.Annex A describes additional considerations for method B that hav

25、e been found useful for the testing of thin-walled helically wound pipes and can be used to supplement the basic text.NOTE This International Standard does not address the determination of longitudinal tensile modulus. Due to the multi-layer construction of many GRP pipes, the accurate measurement o

26、f strain, necessary for modulus determination, can be very difficult. If it is desired to determine longitudinal modulus, see ISO 527-4 and/or ISO 527-5.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1helical woundrefers to filament-wound pipes

27、made with a balanced winding angleNote 1 to entry: Sometimes called cross wound.2.2longitudinal tensile strengthLA*LB*maximum tensile force in the longitudinal direction per unit mean circumference at failure Note 1 to entry: It is expressed in newtons per millimetre of the circumference (N/mm).Note

28、 2 to entry: The subscripts A and B denote the method of test used.INTERNATIONAL STANDARD ISO 8513:2016(E) ISO 2016 All rights reserved 1BS ISO 8513:2016ISO 8513:2016(E)2.3mean circumferencecircumference corresponding to the mean diameter multiplied by ( 3,141 6)Note 1 to entry: It is expressed in m

29、illimetres.2.4mean diameterdmdiameter of the circle corresponding with the middle of the pipe wall cross-sectionNote 1 to entry: It is given by any of the following:a) the average of the external diameter of the pipe minus the average of the wall thickness;b) the external circumference of the pipe d

30、ivided by ( 3,141 6) minus the average of the wall thickness;c) the average of the internal diameter of the pipe plus the average of the wall thickness.Note 2 to entry: It is expressed in millimetres.2.5ultimate longitudinal tensile stressL,ULTmaximum longitudinal tensile force per unit cross-sectio

31、nal area at failureNote 1 to entry: It is expressed in newtons per square millimetre (N/mm).2.6ultimate elongationLelongation coincident with the ultimate longitudinal tensile stressNote 1 to entry: For the purposes of this International Standard, the measurement of elongation is limited to measurem

32、ent of the movement of the tensile testing machine cross-heads.Note 2 to entry: It is expressed as a percentage of an initial gauge length or free length of a test piece.3 PrincipleTest pieces comprising either strips cut longitudinally from a pipe wall segment (method A) or a specified length of pi

33、pe (method B) are subjected to extension in the longitudinal direction at a constant speed such that fracture occurs within a specified time.The tensile properties are determined using the initial dimensions of the test piece, the tensile force, and the cross-head movement.NOTE It is assumed that th

34、e following test parameters are set by the standard making reference to this International Standard:a) the methods to be used, i.e. method A or method B;b) the number of test pieces (see 5.4);c) if applicable, the requirements for conditioning, e.g. temperature, humidity, time, and associated tolera

35、nces (see Clause 6);d) the test temperature and its tolerance (see Clause 7);e) the properties to be measured (see Clause 8).2 ISO 2016 All rights reservedBS ISO 8513:2016ISO 8513:2016(E)4 Apparatus4.1 Tensile-testing machine, of the constant rate of cross-head movement type, incorporating the follo

36、wing features:a) a fixed part, fitted with a grip to hold one end of the test piece without permitting any longitudinal movement thereof, and a moveable part, incorporating a grip to hold the other end of the test piece during extension the fixed and moving parts and their associated grips (see 4.2)

37、 shall enable the test piece to be aligned when a force is applied so that its longitudinal axis coincides with the direction of this force;b) a drive mechanism, capable of imparting a constant speed (see 8.3) to the moving part;c) a force indicator, capable of measuring the force applied to a test

38、piece which is held in the grips (the mechanism shall be free from significant inertia lag at the necessary speed of testing and shall indicate or record force, or consequent stress, with an accuracy of within 1 % of the value to be measured);d) a means to measure the cross-head movement as a functi

39、on of the applied load.4.2 Grips, for holding the test piece.Each of the two grips shall be capable of holding one end of the test piece without slip or crushing to an extent that will affect the results obtained. Grips which tighten automatically might be suitable. Typical grips for a pipe section

40、test piece (see 5.3) are shown in Figure 1.Key1 mandrel2 segmented grips3 sleeve4 reinforcing band5 test pieceFigure 1 Typical grips for a pipe section test piece (method B)4.3 Dimension measurement devices, capable of measuring the necessary dimensions of the test piece (e.g. length, width, wall th

41、ickness) to an accuracy of half the accuracy required in Clause 8 for measurements, e.g. a measuring accuracy of 0,1 mm requires a device accuracy of 0,05 mm.5 Test pieces5.1 GeneralThe test piece shall be a strip or dumbbell conforming to 5.2, or a pipe section conforming to 5.3. ISO 2016 All right

42、s reserved 3BS ISO 8513:2016ISO 8513:2016(E)The test piece shall be obtained in such a way that it is not damaged.The test piece width guidelines might, of necessity, need to be altered for thick wall pipes to smaller values to reflect the testing machine capacity. This is due to some GRP pipes bein

43、g made in very high thickness to address high pressure and large diameter applications. The testing of such narrower samples will lead to a more conservative indication of strength for thick wall pipes.For thick wall test pieces, it might also be necessary to clamp the specimen on the cut cross-sect

44、ion sides to allow the specimen to fit into the testing grips.For pipes with a layered wall construction, it might also be necessary to reinforce the gripped ends to obtain a more even distribution of tensile force.For pipes reinforced in the axial direction with tapes, fabrics, or mats of a fixed w

45、idth, it might be necessary to increase the test sample length to ensure that a cross-section with the minimum number of layers of reinforcement (the apparent lowest strength area) falls within the gauge length.NOTE The test pieces for method A can be cut from a ring previously used for the determin

46、ation of the initial specific ring stiffness.5.2 Strip test piece (method A)5.2.1 ShapeEach test piece shall be a strip cut in the longitudinal direction of the pipe and either shaped to the dimensions of the applicable dumbbell as shown in Figure 2 or a parallel-sided (rectangular) test piece as sh

47、own in Figure 3.5.2.2 Dimensions5.2.2.1 LengthThe length, l, of the test piece shall be (300 15) mm (see Figure 2 and Figure 3).5.2.2.2 Shaped stripThe gauge length, lG, of the test piece shall be as follows (see Figure 2):100 mm lG 150 mm (1)The radius, R, shall be machined to conform to the follow

48、ing limits (see Figure 2):50 mm R 70 mm (2)The width, bG, of the test piece within the gauge length shall conform to the following requirements (see Figure 2 and 5.2.1):bG= (10 1) mm for DN 150 (3)bG= (25 1) mm for DN 150 (4)The total width, b, of the test piece shall conform to the following requir

49、ements (see Figure 2):b = (18 2) mm for DN 150 (5)4 ISO 2016 All rights reservedBS ISO 8513:2016ISO 8513:2016(E)b = (40 2) mm for DN 150 (6)The above width guidelines might need to be reduced to accommodate thick wall pipes (see 5.1).Key1 centroid of gauge length cross-section2 ends built up with plain or reinforced thermoset resin and trimmed flat and parallel, if requirede wall thicknessl test sample lengthlGgauge lengthb total test sample widthbGwidth of gauge lengthR radiusFigure 2 Shaped