1、BRITISH STANDARD BS EN ISO 13938-1:1999 Textiles Bursting properties of fabrics Part1: Hydraulic method for determination of bursting strength andbursting distension The European Standard EN ISO13938-1:1999 has the status of a BritishStandard ICS 59.080.30BSENISO13938-1:1999 This BritishStandard, ha
2、ving been prepared under the directionof the Sector Committeefor Materials and Chemicals, waspublished underthe authorityof the Standards Committee and comesinto effect on 15November1999 BSI04-2000 ISBN 0 580 35389 3 National foreword This BritishStandard is the English language version of EN ISO139
3、38-1:1999. It is identical with ISO13938-1:1999. Together with BSEN ISO13938-2:1999, it supersedes BS4768:1972, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee TCI/24, Physical testing of textiles, which has the responsibility to: aid enquirers to und
4、erstand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented o
5、n this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The BritishStandards w
6、hich implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include
7、 all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi a
8、ndii, theEN ISO title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date Comm
9、entsBSENISO13938-1:1999 BSI 04-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN ISO13938-1 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO13938-1 August1999 ICS 59.080.30 English version Textiles Bursting properties of fabrics Part1:Hydraulic method f
10、or determination of bursting strength and bursting distension (ISO13938-1:1999) Textiles Proprits de rsistance lclatement des toffes Partie1: Mthode hydraulique pour la dtermination de la rsistance et de la dformation lclatement (ISO13938-1:1999) Textilien Bersteigenschaften von textilen Flchengebil
11、den Teil1: Hydraulisches Verfahren zur Bestimmung von Berstdruck und Berstwlbung (ISO13938-1:1999) This European Standard was approved by CEN on6December1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard th
12、e status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German
13、). A version in any other language made by 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 the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finla
14、nd, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Bru
15、ssels 1999 CEN All rights of exploitation in any form and by any means reserved worldwideforCENnationalMembers. Ref.No.ENISO13938-1:1999EENISO13938-1:1999 BSI 04-2000 2 Foreword The text of EN ISO13938-1:1999 has been prepared by Technical Committee CEN/TC248 “Textiles and textile products”, the sec
16、retariat of which is held by BSI, in collaboration with Technical Committee ISO/TC38 “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 latest by February2000, and conflicting national standards sh
17、all be withdrawn at the latest by February2000. It is a revision of ISO2960:1974. EN ISO13938 is in two parts as follows: prEN ISO13938-1, Textiles Bursting properties of fabrics Part1: Hydraulic method for determination of bursting strength and bursting distension (ISO/FDIS13938-1:1998). prEN ISO13
18、938-2, Textiles Bursting properties of fabrics Part2: Pneumatic method for determination of bursting strength and bursting distension (ISO/FDIS13938-2:1998). NOTENormative references to International Standards are listed in Annex ZA (normative). According to the CEN/CENELEC Internal Regulations, the
19、 national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom.
20、 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Principle 3 5 Sampling 4 6 Apparatus 4 7 Atmospheres for conditioning and testing 4 8 Procedure 4 9 Calculation and expression of results 5 10 Test report 5 Annex A (informative) Selection of testing areas 6 Annex ZA (nor
21、mative) Normative referencestoInternational publications withtheirrelevantEuropean publications Inside back cover Figure A.1 Recommended position of testingareas or test specimens 6ENISO13938-1:1999 BSI 04-2000 3 1 Scope This standard describes a hydraulic method for the determination of bursting st
22、rength and bursting distension of textile fabrics. In this part a hydraulic pressure is applied using a constant rate of pumping device. NOTEprEN ISO13938-2 describes a method using pneumatic pressure. The method is applicable to knitted, woven, nonwoven and laminated fabrics. It may be suitable for
23、 fabrics produced by other techniques. The test issuitable for test specimens in the conditioned or wetstate. From the available data there appears to be no significant difference in the bursting strength results achieved using hydraulic or pneumatic burst testers, for pressures up to800kPa. This pr
24、essure range covers the majority of performance levels expected of general apparel. For specialty textiles requiring high bursting pressures, the hydraulic apparatus is more suitable. 2 Normative references The following normative documents contain provisions which, through reference in this text, c
25、onstitute provisions of this part of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the
26、 most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid InternationalStandards. ISO139:1973, Textiles Standard atmospheres for conditioning
27、 and testing. EN ISO3696, Water for analytical laboratory use Specification and test methods (ISO3696:1987). EN30012-1:1993, Quality assurance requirements for measuring equipment Part1: Metrological confirmation system for measuring equipment (ISO10012-1:1992). 3 Definitions For the purposes of thi
28、s standard the following definitions apply: 3.1 test area area of the test specimen within the circular clamping device 3.2 bursting pressure (pressure at burst) maximum pressure applied to a test specimen clamped over an underlying diaphragm until the test specimen ruptures 3.3 bursting strength (s
29、trength at burst) pressure obtained by subtracting the diaphragm pressure from the mean bursting pressure 3.4 diaphragm pressure pressure applied to the diaphragm, with no test specimen present, to distend it to the mean bursting distension of the test specimen 3.5 bursting distension (distension at
30、 burst) expansion of a test specimen at the bursting pressure it is expressed either as height at burst or as volume at burst 3.6 height at burst distance between the upper surface of the test specimen before distension and the top of the test specimen at the bursting pressure 3.7 volume at burst vo
31、lume of pressurizing fluid pumped at the burstingpressure 3.8 time to burst time taken to distend a test specimen to burst 4 Principle A test specimen is clamped over an expansive diaphragm by means of a circular clamping ring. Increasing fluid pressure is applied to the underside of the diaphragm,
32、causing distension of the diaphragm and the fabric. The volume of fluid is increased at a constant rate per unit time until the test specimen bursts. The bursting strength and bursting distension are determined.ENISO13938-1:1999 4 BSI 04-2000 5 Sampling Either select samples in accordance with the p
33、rocedure laid down in the material specification for the fabric, or as agreed between the interested parties. In the absence of an appropriate material specification, an example of a suitable sampling procedure is given in Annex A. Avoid areas that are folded or creased, selvedges and areas not repr
34、esentative of the fabric. The system of clamping used generally permits tests to be applied without cutting out test specimens. 6 Apparatus 6.1 Bursting tester Metrological confirmation of the bursting tester shall be carried out in accordance with EN30012-1:1993. The bursting tester shall comply wi
35、th the following requirements: 6.1.1 The apparatus shall be capable of producing various constant rates of increase in volume per unit time between100cm 3 /min and500cm 3 /min to within 10% of the indicated value. If the apparatus is not equipped to adjust fluid volume, a testing time to burst of(20
36、 5) s may be applied. This shall be indicated in the test report. 6.1.2 Bursting pressure shall be indicated with an accuracy of 2% of full scale range above the first20% of range. 6.1.3 Height at burst up to70mm shall be indicated with an accuracy of 1mm. Zero position of the measuring gauge shall
37、be adjustable to accommodate the thickness of the test specimen. 6.1.4 Means for indicating the volume at burst (ifavailable) to within 2% of the indicated value. 6.1.5 A test area of50cm 2 (79,8mm diameter) shall be used. Other test areas of100cm 2 (112,8mm diameter) or10cm 2 (35,7mm diameter) or7,
38、3cm 2 (30,5mm diameter) may be used, if the preferred test area is not applicable in the existing testing equipment, or due to high or low expansion of the fabric or other fabric requirements, or by mutual agreement. 6.1.6 The clamping device shall provide for clamping of the test specimen securely
39、without distortion or damage and prevent slippage during the test. The clamping ring shall allow undisturbed vaulting of highly expansive fabrics (e.g.fabric test specimens whose height at burst is greater than half of the test specimen diameter). All test specimen clamping ring inner diameters shal
40、l be accurate to 0,2mm. To avoid test specimen damage a small curvature at the inner edge of the clamping ring facing the test specimen is recommended. 6.1.7 A safety cover shall enclose the clamping device during the test when the expansion of the test specimen takes place. It shall allow clear obs
41、ervation of the expansion of the test specimen during the test. 6.1.8 The diaphragm shall meet the following requirements: thickness up to2mm; highly expansive; if the diaphragm is to be used several times, it shall be elastic within the range of height at burst observed during the test; resistant a
42、gainst pressurizing fluids used. 7 Atmospheres for conditioning and testing The atmospheres for preconditioning, conditioning and testing shall be as specified in ISO139:1973. Preconditioning and conditioning are not required for wet tests. 8 Procedure 8.1 Prior to testing the sample shall be condit
43、ioned in the relaxed state in accordance with clause7. During conditioning and testing maintain the test specimens in the atmosphere for conditioning and testing in accordance with clause7. 8.2 Set a test area of50cm 2 (see6.1.5). NOTE 1For most fabrics, particularly knitted fabrics, the test area o
44、f50cm 2is applicable. For fabrics with low extensibility (known from previous experience or preliminary testing), e.g.forfabrics for technical application, a test area of100cm 2is recommended. In cases where these conditions cannot be met or are not appropriate alternative test areas in accordance w
45、ith6.1.5 may be used if mutually agreed. NOTE 2Comparison of results requires the test to be performed with the same test areas and rates of increase in volume. 8.3 Set a constant rate of increase in volume of between100cm 3 /min and500cm 3 /min depending on test area and fabric requirements. Or adj
46、ust a time to distend a test specimen to burst of(20 5) s using preliminary trials, if a constant rate of increase in volume is not applicable. 8.4 Place the test specimen over the diaphragm so that it lies in a flat tensionless condition, avoiding distortion in its own plane. Clamp it securely in t
47、he circular holder, avoiding jaw damage, to prevent slippage during the test. Place the distension recording device into the measuring position and adjust it to the zero position. Fasten the safety cover in position according to machine requirements. Apply pressure to the test specimen until the fab
48、ricbursts.ENISO13938-1:1999 BSI 04-2000 5 Immediately after burst, reverse the apparatus to starting position. Note bursting pressure and height at burst and/or bursting volume. If the test specimen bursts close to the edge of the clamping device, report this fact. Reject jaw breaks occurring within
49、2mm of the clamping line. Repeat the test at least four more times at different places on the fabric. The number of test specimens may be increased if agreed mutually. 8.5 Diaphragm correction With the same test area and rate of increase in volume or time to burst as that employed in the above tests, distend the diaphragm without the presence of a test specimen by an amount equal to the mean height at burst or the mean volume at burst of the test specimen. Note the pressure at this distension of the diaphragm as the “d
