EN 12814-4-2018 Testing of welded joints of thermoplastics semi-finished products - Part 4 Peel test.pdf

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1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Testing of welded joints of thermoplastics semi-finished productsPart 4: Peel testBS EN 128144:2018Incorporating corrigendum August 2018National forewordThis British Standard is the UK implementation of EN 128144:2018,

2、incorporating corrigendum July 2018. It supersedes BS EN 128144:2001, which is withdrawn.The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Text altered by CEN corrigendum July 2018 is indicated in the text by .The UK participation in its preparation

3、was entrusted to Technical Committee PRI/80, Welding thermoplastics.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 responsible for its correct applica

4、tion. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 539 01823 3ICS 25.160.40Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committ

5、ee on 30 April 2018.Amendments/corrigenda issued since publicationDate Text affected31 August 2018 Implementation of CEN corrigendum July 2018BRITISH STANDARDBS EN 128144:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 128144April 2018ICS 25.160.40 Supersedes EN 128144:2001EUROPEAN COMMITTEE F

6、OR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN 128144:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersTesting of welded joint

7、s of thermoplastics semifinished products Part 4: Peel testEssai des assemblages souds sur produits semifinis en thermoplastiques Partie 4 : Essai de pelagePrfen von Schweiverbindungen aus thermoplastischen Kunststoffen Teil 4: SchlversuchThis European Standard was approved by CEN on 10 December 201

8、7.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. Uptodate lists and bibliographical references concerning such national standards may be obtained on a

9、pplication to the CENCENELEC 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 CENCENELEC Ma

10、nagement 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, Latv

11、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.This document consolidates EN 128144:2018 and the corrigendum EN 128144:2018/AC:2018.English VersionEN 12814-4:2018 (E)European foreword

12、 iii1 Scope . 42 Normative references 43 Terms and definitions . 44 Symbols and designations 45 Tpeel test . 55.1 Principle of the test . 55.2 Test specimens 55.2.1 Dimensions of test specimens 55.2.2 Preparation of test specimens 65.2.3 Number of test specimens . 65.2.4 Conditioning of test specime

13、ns . 65.3 Apparatus 65.4 Test procedure . 65.5 Calculation of the peel resistance . 76 Decohesion test 86.1 Principle of the test . 86.2 Test specimens 86.2.1 Dimensions of test specimens 86.2.2 Preparation of test specimens 86.2.3 Number of test specimens 116.2.4 Conditioning of test specimens 116.

14、3 Apparatus . 116.4 Test procedure 116.5 Calculation of the percentage of the brittle fracture .127 Crush test .127.1 Principle of the test 127.2 Test specimens . 127.2.1 Dimensions of test specimens . 127.2.2 Preparation of test specimens . 137.2.3 Number of test specimens 137.2.4 Conditioning of t

15、est specimens 137.3 Apparatus . 137.4 Test procedure 148 Test report 14Bibliography .16iiContents PageBS EN 128144:2018EN 12814-4:2018 (E)European forewordThis document (EN 128144:2018) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN.This Europ

16、ean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2018, and conflicting national standards shall be withdrawn at the latest by October 2018.Attention is drawn to the possibility that some of the eleme

17、nts 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 128144:2001.This document includes the corrigendum EN 128144:2018/AC:2018 which corrects the symbol for the peel resist

18、ance in 5.5, 2ndparagraph, 1stline.In comparison with the previous edition, the following technical modifications have been made: the procedures in the Clauses “Tpeel test”, “Decohesion test”, “Crush test” have been detailed with specifications and consequently with the reference figures.EN 12814, T

19、esting of welded joints of thermoplastics semi-finished products, is composed with the following parts: Part 1: Bend test; Part 2: Tensile test; Part 3: Tensile creep test; Part 4: Peel test; Part 5: Macroscopic examination; Part 6: Low temperature tensile test; Part 7: Tensile test with waisted tes

20、t specimens; Part 8: Requirements. According to the CENCENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav

21、Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.iiiBS EN 128144:2018EN 12814-4:2018 (E)1 Scope

22、This document specifies the dimensions, the method of sampling and the preparation of the test specimens, and also the conditions for performing the peel test perpendicular to the weld in order to determine the peel resistance and the failure behaviour.A peel test can be used in conjunction with oth

23、er tests (e.g. tensile creep, macroscopic examination.) to assess the performance of welded assemblies, made from thermoplastics materials.Peel tests are applicable to overlap welded assemblies made from thermoplastics materials.The Tpeel test as defined in Clause 5 will be used only for assessing w

24、elded sheet assemblies. This test is not applicable to welded test pieces containing sheets of different nominal thickness.The decohesion test as defined in Clause 6 will be used only for assessing electrofusion joints with nominal thickness of pipe/fitting greater than 10 mm.For socket fusion and f

25、or electrofusion socket joints with nominal outside diameter less than or equal to 90 mm, a crush test will be used, as defined in Clause 7.The crush test can also be used for electrofusion joints with outside diameters greater than 90 mm.The crush test for electrofusion saddle joints will be perfor

26、med in accordance with ISO 13955 1.NOTE A decohesion test is also defined in ISO 13954 2.The tests defined in this standard are not intended to be used for assessment and/or qualification of thermoplastic fittings that already have their own requirements, e.g. polyethylene fittings according to EN 1

27、5553 3 and EN 122013 4.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenc

28、ed document (including any amendments) applies.ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification3 Terms and definitionsFor the purposes of this document, the following term and definition apply.ISO and IEC maintain terminol

29、ogical databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1peel resistancePlarithmetic mean of the force values divided by the width of the test specimen (only r

30、elevant for Tpeel test)4 Symbols and designationsFor the purposes of this document, the symbols and designations given in Table 1 apply.4 BS EN 128144:2018EN 12814-4:2018 (E)Table 1 Test specimen designationsSymbols and abbreviationsDesignations UnitsanNominal thickness of test piece mmb Width of th

31、e test specimen mmc Maximum width of the air channel (if applicable) mmCcPercentage of brittle failure %d2Maximum brittlefracture length measure mmdnNominal outside diameter of pipe mmFwMaximum force measured during the test NLcClamped length of test specimen ligament mmLdLength of fracture in the f

32、usion plane mmLiFree length of test specimen mmLwaMaximum width of the weld of the test specimen mmPlPeel resistance N/mmy Fusion zone length of electrofusion socket mmaFor welds containing an air channel, Lwshall be taken as the width of the whole weld minus the width of the channel (c). 5 Tpeel te

33、st5.1 Principle of the testThe test consists of peeling a test specimen at a constant rate of displacement until it fractures, peels or yields.5.2 Test specimens5.2.1 Dimensions of test specimensThe test specimen is shown in Figure 1 and the dimensions are given in Table 2.Figure 1 T-peel test speci

34、menThe value of Lcshall be greater than, or equal to, b.5BS EN 128144:2018EN 12814-4:2018 (E)Table 2 Dimensions of test specimenDimensions in millimetresanb aLian 1,5 15 151,5 5 5 x an 10 x anaFor reinforced materials, b shall be 50 mm. The tolerance for b shall be 0,5 mm.5.2.2 Preparation of test s

35、pecimensThe time between the end of the welding operations and the start of machining operations, shall be at least 8 h.The welded test specimens shall be cut perpendicular to the welded joint.The test specimens shall be cut with parallel sides as shown in Figure 1.During cutting, heating of the tes

36、t specimen should be avoided.Cutting of the test specimen shall not produce notches.After cutting, a visual examination of the weld should be carried out and any imperfections, as defined in EN 14728 5, recorded.Each test specimen shall be marked so that its original position in the test piece can b

37、e identified.5.2.3 Number of test specimensAt least 5 specimens shall be tested for each welded test piece unless otherwise specified in the relevant application standard.5.2.4 Conditioning of test specimensNo heat treatment or mechanical straightening operations shall be carried out on the test spe

38、cimen.After machining, the test specimens shall be conditioned at least 2 h at the testing temperature.5.3 ApparatusThe test equipment shall conform to the requirements given in ISO 5893.The crosshead displacement shall be continuous, uniform and in accordance with Table 3.After setting, the rate sh

39、all not vary during the course of any test or series of tests by more than 5 % of the mean rate and shall remain within the limits imposed in Table 3.The force shall be measured and recorded with an accuracy of 2 %.The test equipment shall be provided with a suitable selfaligning grip to hold the sp

40、ecimen.5.4 Test procedureThe two unwelded ends of the test specimen shall be bent in opposite directions until each end is perpendicular to the weld, to form a Tshaped specimen (see Figure 2) for clamping in the jaws of the 6 BS EN 128144:2018EN 12814-4:2018 (E)test equipment. Inserting the test spe

41、cimen into the test equipment shall not cause cracking at the weld. If it does, the test is invalid.Unless otherwise specified, the test shall be carried out at a room temperature of (23 2) C.The test speeds for some relevant thermoplastic materials are listed in Table 3.Table 3 Tpeel test speeds fo

42、r some thermoplasticsMaterial Speed mm/minPVC 10 2PVDF, PPH, PPB 20 2,5PE, PPR 50 5For other materials, the test speed shall be agreed between the contracting parties.Key1,2 jawFigure 2 Peel test arrangementIn order to provide additional information, a graph of force versus crosshead displacement ma

43、y be recorded for each specimen.5.5 Calculation of the peel resistanceAt least five test specimens shall be used in the evaluation of the peel resistance. No test specimen shall be disregarded unless failure occurs in the clamps.The peel resistance, Pl, is calculated using the following formula:wher

44、e7BS EN 128144:2018EN 12814-4:2018 (E)wis the arithmetic mean of the maximum force valuesb is the width of the test specimens6 Decohesion test6.1 Principle of the testA fused socket joint is sectioned at four equidistant positions around the circumference of the fitting and subjected to a longitudin

45、al peel test, such that the resultant peel should be along the length of the fusion interface. Separation of the joint components is taken to completion and the parted surfaces shall be inspected for evidence of ductile and/or brittle failure along the joint interface.6.2 Test specimens6.2.1 Dimensi

46、ons of test specimensThe dimensions of the test specimens are given in Figures 3, 4 and 5.6.2.2 Preparation of test specimens6.2.2.1 GeneralThe test specimens shall be cut with parallel sides as shown in Figures 3, 4 and 5.During cutting, heating of the test specimen should be avoided.Cutting of the

47、 test specimen shall not produce notches.After cutting, a visual examination of the weld should be carried out and any imperfections, as defined in EN 14728 5, recorded.Initially, standard test specimens shall be used for the decohesion test. If the joint cannot be broken, using this test specimen,

48、a side grooved test specimen shall be used (see 6.2.2.3).Each test specimen shall be cut from an assembly between a socket and a spigot end of a fitting or a pipe.6.2.2.2 Cutting of test specimensThe conditioned welded assembly shall be cut into parallelsided sections (see Figure 3).8 BS EN 128144:2

49、018EN 12814-4:2018 (E)Keyb = 20 (90 180)Figure 3 Cutting test specimensTest specimens shall be spaced at equidistant intervals around the joint circumference. The specimen length shall include the fusion zone and both cold zones of the electrofusion joint.Test specimen shall not include terminals.For electrofusion joints with nominal outside diameter greater than 90 mm and up to and including180 mm, the width b of the test specimen shall be 20 mm.For pipes of