1、STD-BSI BS EN IS0 L3937-2-ENGL 2000 m Lb24bb7 0648455 795 BRITISH STANDARD Textiles - Tear properties of fabrics - Part 2: Determination of tear force of trouser-shaped test specimens (Single tear method) The European Standard EN IS0 13937-22000 has the status of a British Standard BS EN IS0 13937-2
2、:2000 NO COPYING WITHOUT BSI PERMISSION EXCEPT As PERMl“ED BY COPYRIGET LAW STD.BS1 BS EN IS0 13937-2-ENGL 2000 D Lb24hh 0848456 821 9 Amd. No. BS EN IS0 13937-2:2OOO Date Comments National foreword This British Standard, having been prepared under the direction of the Sector Committee for Materiais
3、 and Chemicals, was published under the authority of the standards Committee and comes into effect on 15 June 2000 Q BSI WZ ISBN O 580 34957 8 This British Standard is the official English language version of EN IS0 13937-2:2OOO. It is identical with IS0 13937-2:2000. The UK participation in its pre
4、paration was entrusted to Technical Committee TCUN, Physical testing of textiles, which has the responsibility to. - aid enquirem to understand the text; - present to the responsible internationallEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK intere
5、sts informed; - monitor related intedonal and European developments and promulgate them in the UK. A list of organizations represented on this commitee can be obtained on request to its secrem. Cross-references Attention is dram to the fact that CEN and CENELEC standards normally include an annex wh
6、ich liss normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondenc
7、e Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include aii the nece- provisions of a contract Usem of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself co
8、nfer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 title page, pages 2 to 17 and a back cover. The BSI copyright notice displayed in this document indicates when the document WaSzastiSSUed. Amendments issued since publicati
9、on I I STD.BSI BS EN IS0 13737-2-ENGL 2000 = 1624hb 0848457 768 E EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 13937-2 April 2000 ICs English version Textiles - Tear properties of fabrics - Part 2: Determination of tear force of trouser-shaped test specimens (Single tear method) (IS0 139
10、37-2:2000) Textiles - Proprits de d6chirement des offes - Pare 2: Dtermination de la force de dfkhirure des prouvetes pantalons (Mthode de la dchirure unque)(lSO 13937- 2:2000) Textilien - Weiterreieigenschaften von textilen RBchengeMlden - Teil 2: Bestimmung der Weiterreikraft mit dem Schenkel-Welt
11、erreiversuch (einfacher Weiterreiversuch) (IS0 13937-2:2OOO) This European Standard was approved by CEN on 2 July 1999. CEN members are bound to comply with ie CEWCENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without a
12、ny alteration. Up-to-date lists and bibliographicai references concerning such national standards may be obtained on applcation to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by
13、 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are aie national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ire
14、land, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain. Sweden, Swberland and UnHed Kingdom. EUROPEAN COMMEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretarlat: rue de Sassart, 36 6-1050 Brussels O 2000 CEN Ali rights of exploitation in an
15、y form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 13937-2:2OOO E Page 2 EN IS0 13937-2:2000 Contents 3 . 4 Foreword Introduction 4 1 scope 4 2 Normative references . 3 Terms and definitions 5 4 Principle . 5 5 Sampling 6 Apparatus . . 5 6 7 Atmosphere for condition
16、ing and testing 6 8 Preparation of test specimens 6 9 9 Procedure . . . 1 O Calculation and expression of results 10 11 Test report 11 Annex A (informative) Suggested procedure for sampling . . 12 Annex 6 (informative) laboratory sample 13 Annex C (informative) 14 14 15 17 Example of pattern for cut
17、ting out test specimens from the . Sample calculation of tear force . Annex D (normative) Wide-width trouser test specimens . Bibliography. . STD.BS1 BS EN IS0 13937-2-ENGL 2000 E 1624669 0848459 530 Page 3 EN IS0 13937-2:2000 Foreword The text of EN IS0 13937-2:2000 has been prepared by Technical C
18、ommittee CENiTC 248 “Textiles and textile products, the secretariat of which is held by BSI, in collaboration with Technical Committee ISOiTC 38 “Textiles“. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the l
19、atest by Octobre 2000, and conflicting national standards shall be withdrawn at the latest by Octobre 2000. According to the CENEENELEC Intemal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic
20、, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. STD*BSI BS EN IS0 L3937-2-ENGL 2000 I Lb24bb9 08484h0 252 0 Page 4 EN IS0 13937-2:2OOO Introduction EN IS0 13937 has been prepared as a
21、part of several test methods for the determination of certain mechanical properties of textiles using mainly tensile-testing machines, e.g. tensile properties, seam tensile properties, tear properties, seam slippage. Test requirements for these standards agree where appropriate. The results obtained
22、 by one of the methods should not be compared with aiose obtained by other methods. Annex E lists test methods standardized in this context. EN IS0 13937 specifies methods for the determination of tear force of fabrics. Part 1 describes a ballistic pendulum method, parts 2 to 4 describe methods usin
23、g tensile-testing machines. 1 Scope This part of EN IS0 13937 describes a single-tear method to determine fabric tear force, known as the trouser test, using a test specimen cui to form trouser-shaped legs. The tear force measured is the force required to propagate a previously started single tear w
24、hen the force is applied parallel to the cut and the fabric tears in the direction of applied force. The test is mainly applicable to woven textile fabrics. It may be applicable to fabrics produced by other techniques, e.g. to some nonwovens (with the same under-mentioned restrictions as for the wov
25、en fabrics). In general the method is not applicable to knitted fabrics and woven elastic fabrics. It is not suitable for highly anisotropic fabrics or loose fabrics where tear transfer from one directon to another direction of the fabric during the tear test is likely to occur. The method only allo
26、ws the use of constant-rateof-extension (CRE) testing machines. NOTE 1: For other tear test methods using tensile-testing machines part 3 of EN IS0 13937 describes a method known as the wing test and part 4 the tongue test method. Part 1 of EN IS0 13937 describes the ballistic pendulum (Elmendorf) m
27、ethod. NOTE 2: For the trapezoidal test method, see IS0 9073-4 for nonwovens or IS0 4674 for coated fabrics. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this Intemational Standard. For dated references, s
28、ubsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Intemational Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references,
29、the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of currently valid Intemational Standards. IS0 139 Textiles - Standard atmospheres for conditioning and testing IS0 7500-1 IS0 10012-1 Metallic materials - Verification of static uniaxial test
30、ing machines - Part 1 - Tensile testing machines Quality assurance requirements for measuring equipment - Part 1 : Metrological confirmation system for measuring equipment Page 5 EN IS0 13937-2:2000 3 Terms and definitions For the purposes of this pari of EN IS0 13937 the following terms and definit
31、ions apply: 3.1 constant-rateof-extension (CRE) testing machine: Tensile-testing machine where one clamp is stationary whilst the other is moving with a constant speed throughout the test and where the entire testing system is virtually free from deflection. 3.2 gauge length: Distance between the tw
32、o effective clamping points of a testing device. NOTE: The effective clamping points (or lines) of jaws can be checked by clamping a test specimen under defined pretension with carbon copy paper to produce a gripping paitem on the test specimen and/or jaw faces. 3.3 tear force: Force required to pro
33、pagate a tear initiated under the specified conditions. NOTE: The tear force is qualified as “across warp“ or “across weft“ according to whether the tear is made across the warp (warp threads are tom) or weft threads (weft threads are tom) respectively. 3.4 peak Point on a forcdextension cum where t
34、he gradient, relative to the force values recorded, changes from positive to negative. NOTE: For tear recordings, the peak to be used for calculation is defined by rising and falling of force of at least 1 O YO of the last decreasing or increasing force values respectively. 3.5 length of tear: Measu
35、red distance propagated by a tearing force from the initiation of the force until its termination. 3.6 Trouser shaped test specimen: Rectangular test specimen having a single cut of defined length made in the centre of the shorter edge to form two trouser legs for clamping (see figures 1 and 2). 4 P
36、rinciple A rectangular test specimen is cut in the centre of the shorter edge to form a trouser shape. The legs of the trouser are gripped in the clamps of a recording tensile testing machine to form a straight line and pulled in the direction of the cut to tear the fabric. The force to continue the
37、 tear over a specified distance is recorded. The tear force is calculated from the force peaks of the autographic trace, or on-line by electronic means. 5 Sampling Select samples either in accordance with the procedure laid down in the material specification for the fabric, or as agreed between the
38、interested parties. In the absence of an appropriate material specification an example of a suitable sampling procedure is given in annex A. An example of a pattern for cutting test specimens from the laboratory sample is given in annex B. Avoid test areas with folded or creased places, selvedges an
39、d areas not representative of the fabric. _ STD-BSI BS EN IS0 L3737-2-ENGL 2000 H Lb24hb7 0848462 025 D Page 6 EN IS0 13937-2:2000 6 Apparatus 6.1 General The system for metrological confirmation of the tensile-testing machine shall be in accordance with IS0 10012-1. 6.2 CRE machine, having the foll
40、owing characteristics: a) Capable of operating at a constant-rate-of-extension of (1 00 * 1 O) mm/min; b) capable of gauge length to be set to (100 * 1) mm; c) provided with means for recording the force applied to the test specimen during the tear test; d) under conditions of use, the accuracy of t
41、he apparatus shall be class 1 of IS0 7500-1 The error of the indicated or recorded maximum force at any point in the range in which the machine is used shall not exceed 1 Y, and the error of the indicated or recorded jaw separation shall not exceed * 1 mm; e) if recording of force and extension is o
42、btained by means of data acquisition boards and software, the frequency of data collection shall be at least 8 per second. If a class 2 tensile testing machine has to be used, this shall be stated in the test report. 6.3 Clamping device, comprising the two jaws of the machine, the central points of
43、which are in the line of pull, the front edges at right angles to the line of pull and the clamping faces in the same plane. The jaws shall be capable of holding the test specimen without allowing it to slip and designed so that they do not cut or otherwise weaken the test specimen. The width of the
44、 jaws shall preferably be 75 mm. but shall not be less than the width of the test specimen. 6.4 Equipment for cutting out test specimens, preferably a hollow punch or template to give test specimens of the dimensions shown in figure 1. 7 Atmosphere for conditioning and testing The atmospheres for pr
45、econditioning, conditioning and testing shall be as specified in IS0 139. 8 Preparation of test specimens 8.1 General From each laboratory sample two sets of test specimens shall be cut, one set in the warp direction and the other in the weft direction. Page 7 EN IS0 13937-2:2OOO For other than wove
46、n fabrics, use the relevant designation for direction, ag. length and transverse. Each set shall cunsist of at least five test specimens, or more if agreed. In accordance with clause 5 and annex B, no two test specimens shall contain the same longitudinal or transverse threads, and no specimen shall
47、 be cut within 150 mm of the edge of the fabric. 8.2 Dimensions 82.1 Test specimens 50 mm wide The test specimen (see figure 1) shall be a rectangular strip 200 rnm * 2 mrn long by 50 mm f 1 mm wide; in it shall be made, a longitudinal slit 100 mm f 1 mm in length beginning from the centre of the wi
48、dth. Mark the end of tear (25 f 1) mm from the uncut end of the strip to indicate the position of the tear at the completion of the test. Dimensions in millimetres I F * +I O ua t -2 1 Mark for end of tear length 2 cut Figure 1 - Trouser-shaped test specimen STD.BSI BS EN IS0 13937-2-ENGL 2000 Lb24b
49、b9 0648464 9TB Page 8 EN IS0 13937-2:2000 8.22 Widewldth terit specimens 200 mm wide Test specimens having a width of 200 mm may be tested if agreed by the interested parties. This is recommended for samples where the narrow-width test specimens are considered unsuitable (see 9.4) or for special tear-resistant fabrics. The method for use of wide-width test specimens is described in annex D. 8.3 Cutting out of test specimens For woven fabrics, each test specimen shall be cut out with its length parallel to the warp or the weft of the fabr
