1、BRITISH STANDARDBS EN 14882:2005Rubber or plastic coated fabrics Determination of the static and dynamic coefficient of frictionThe European Standard EN 14882:2005 has the status of a British StandardICS 59.080.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g
2、44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14882:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 26 September 2005 BSI 26 September 2005ISBN 0 580 46662 0National
3、 forewordThis British Standard is the official English language version of EN 14882:2005.The UK participation in its preparation was entrusted to Technical Committee TCI/69, Footwear, leather and coated fabrics, which has the responsibility to:A list of organizations represented on this committee ca
4、n be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” fa
5、cility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligation
6、s. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThi
7、s document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDAR
8、DNORME EUROPENNEEUROPISCHE NORMEN 14882August 2005ICS 59.080.40English VersionRubber or plastic coated fabrics - Determination of the static anddynamic coefficient of frictionSupports textiles revtus de caoutchouc ou de plastique -Dtermination des coefficients de frottement statique etdynamiqueMit K
9、autschuk oder Kunststoff beschichtete Textilien -Bestimmung der Koeffizienten von Haftreibung und BewegungsreibungThis European Standard was approved by CEN on 1 July 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europea
10、nStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, Fren
11、ch, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic
12、, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUR
13、OPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14882:2005: EEN 14882:2005 (E) 2 Contents page Foreword 3 1 Scope .4 2 Normative references .4 3 T
14、erms and definitions.4 4 Principle.4 5 Apparatus 5 6 Preparation of the test specimens.7 7 Conditioning7 8 Procedure 8 9 Calculation and expression of results.8 10 Test report .9 Annex A (informative) Principle of the test method.10 EN 14882:2005 (E) 3 Foreword This European Standard (EN 14882:2005)
15、 has been prepared by Technical Committee CEN/TC 248 “Textiles and textile products”, the secretariat of which is held by BSI. 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 February 2006, and co
16、nflicting national standards shall be withdrawn at the latest by February 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard : Austria, Belgium, Cyprus, Czech Republic, Denmark, Estoni
17、a, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14882:2005 (E) 4 1 Scope This test method details a method of assessing the fricti
18、onal property of coated fabrics. The test consists of measuring the force necessary to move a sled on the surface of coated fabric test specimen and determining the static and dynamic coefficient of friction. 2 Normative references The following referenced documents are indispensable for the applica
19、tion of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 845, Cellular plastics and rubbers - Determination of apparent (bulk) density (ISO 845:1988) EN ISO 1
20、302, Geometrical Product Specifications (GPS) - Indication of surface texture in technical product documentation (ISO 1302:2002) EN ISO 2231, Rubber- or plastics-coated fabrics - Standard atmospheres for conditioning and testing (ISO 2231:1989) EN ISO 2286-1, Rubber- or plastics-coated fabrics - Det
21、ermination of roll characteristics - Part 1: Methods for determination of length, width and net mass (ISO 2286-1:1998) EN ISO 5084, Textiles - Determination of thickness of textiles and textile products (ISO 5084:1996) EN ISO 7500-1, Metallic materials - Verification of static uniaxial testing machi
22、nes - Part 1: Tension/compression testing machines - Verification and calibration of the force-measuring system (ISO 7500-1:2004) EN ISO 12947-1:1998, Textiles - Determination of the abrasion resistance of fabrics by the Martindale method - Part 1: Martindale abrasion testing apparatus (ISO 12947-1:
23、1998) 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 coefficient of static friction (s) coefficient calculated from the ratio of the force necessary to cause the tangential separation of two stationary surfaces to the perpendicular
24、force acting upon the two surfaces 3.2 coefficient of dynamic friction (d) coefficient calculated from the ratio of the force necessary to maintain a constant velocity between two surfaces in contact to the perpendicular force acting upon the two surfaces 4 Principle A sled is attached to a strain g
25、auge and is linked to an autographic recording device The sled is caused to move against the test specimen which is either rigidly mounted on a horizontal bed or the base of the sled. The force to initiate the movement of the sled and thereafter maintain a constant velocity is measured. From specifi
26、c forces, the coefficients of friction (static and dynamic) are calculated. EN 14882:2005 (E) 5 5 Apparatus 5.1 Constant rate of extension tensile testing machine Testing machine of class I as specified in EN ISO 7500-1. The tensile testing machine shall be provided with means for reading and record
27、ing both the force necessary to initiate movement and the force necessary to maintain a constant velocity thereafter. The relative movement is maintained at a constant velocity of (500 50) mm/min. NOTE 1 The recording device could be controlled by computer and a data acquisition frequency of at leas
28、t 8 data per second has proved suitable. NOTE 2 A load cell of maximum 50 N is recommended. 5.2 Steel sled 5.2.1 General The sled is directly linked to the force measuring device with a thin and light string that does not elongate. 5.2.2 Type A sled Sled of (150 1) mm long (100 1) mm wide having a m
29、ass of (700 15) g see Figure 1. The surface of the sled is flat, smooth and polished (Roughness Ra = 0,2 m in accordance with EN ISO 1302). The edges of the sled do not contain any burrs or roughness. Key 1 Orientation of the test Figure 1 Type A sled The edges relative to the surface in contact wit
30、h the test specimen present a chamfer profile of (1,0 0,1) mm, see Figure 2. EN 14882:2005 (E) 6 Dimensions in millimetres Figure 2 Chamfer of the type A sled (detail) 5.2.3 Type B sled Type A sled to which is attached the test specimen. Between the sled and the test specimen is placed a polyurethan
31、e cellular rubber described in Table 1. The test specimen is mounted with the coating outermost on the sled. 123Key 1 Test specimen 2 Polyurethane cellular rubber 3 Type A sled The dimensions of the polyurethane cellular rubber shall be (230 5) mm x (100 1) mm. Figure 3 Type B sled EN 14882:2005 (E)
32、 7 Table 1 Polyurethane cellular rubber description Properties Requirements Test method Thickness (3 1) mm EN ISO 5084 Density (30 3) kg.m3EN ISO 845 indentation hardness (5,8 0,8) kPa Annex B in EN ISO 12947-1:1998 5.2.4 Pulley A pulley shall rotate freely and have a U profile see Figure 4. The pul
33、ley is positioned to maintain the sled in a horizontal position and to keep the string in the direction of force axis on the tensile machine. Figure 4 Profile of the pulley 5.2.5 Flat steel plate A flat steel plate of rigid construction, having a smooth surface. The flat steel plate shall be in a ho
34、rizontal position with the bottom of the pulley. The flat steel plate is of a length to permit a relative surface travel during the test of at least 400 mm and of a width to permit at least 50 mm of clearance between the edge of the sled and any edge obstructions. 6 Preparation of the test specimens
35、 Cut two test specimens of approximately 600 mm 200 mm in the longitudinal direction and two test specimens of approximately 600 mm 200 mm in the transversal direction. If the width of the product doesnt allow to have the defined dimension, note the transversal dimensions in the test report. Test sp
36、ecimens shall be cut in the usable width of the roll (defined in EN ISO 2286-1). For method with sled B, cut two additional coated fabric specimens each measuring (250 5) mm x (100 1) mm, one in the longitudinal direction of the coated fabric and one in the transverse direction of the coated fabric.
37、 7 Conditioning Place the test specimens in a conditioned atmosphere as specified in EN ISO 2231 for at least 16 h prior to testing and carry out the test in this environment. EN 14882:2005 (E) 8 8 Procedure 8.1 General Ensure that surfaces (plate and sleds) are free of irregularities and foreign ma
38、tter. The surface of the sled shall be cleaned between each test specimen with suitable material (e.g. microfibre cloth, paper, etc.) impregnated by appropriate solvent (e.g. alcohol). Identify the surface of the test specimen to be tested. Place the test specimen on the flat steel plate so that the
39、 test specimen is not unduly stretched but is under sufficient tension to prevent the material from wrinkling, creasing or moving during testing, as this would affect the results. 8.2 Mounting of the sled B Determine the mass of the coated fabric test specimen, in g. Determine the mass of the polyur
40、ethane cellular rubber, in g. Mount the polyurethane cellular rubber and the coated fabric test specimen on the sled with the coated surface to be evaluated outermost. 8.3 Measurements Place the sled on the test specimen surface at least 400 mm apart from the pulley in order to record forces on a te
41、sted distance of 400 mm. Fix the string to the sled and to the sensor without tension. After the placement of the sled, carry out the test within 5 s. Ensure that the autographic recording device is registering zero and that the velocity movement is registering 500 mm/min. Engage the driving mechani
42、sm. Repeat the procedure with the other test specimen. 9 Calculation and expression of results 9.1 Coefficient of static friction (s) For each direction, from the autographic record determine the value of the first peak, in cN. It is the necessary value to initiate movement between the test surfaces
43、. Calculate the coefficient of static friction (s) according to the following equation: s = WFs(1) where Fsis the maximum value of the force necessary to initiate movement between the test surface (expressed in cN) EN 14882:2005 (E) 9 W is the mass of the sled and the polyurethane cellular rubber ma
44、ss and the coated fabric test specimen mass when using type B sled (expressed in g) For each direction, calculate the coefficient of static friction (s) as the average of the value of the two specimens and calculate the differences between the mean value and the values of the two test specimens. If
45、the absolute value of a difference is strictly superior to 10% of the mean value, then test additional test specimens until an available difference is obtained. 9.2 Coefficient of dynamic friction (d) For each direction, from the autographic record divide the trace in four equal parts. On the two ce
46、ntral parts determine the median of the peaks in cN. Calculate the coefficient of dynamic friction (d) according to the following equation: d = WFd(2) where Fdis the median value of the force necessary to maintain a constant relative velocity between the test surfaces (in cN) W is the mass of the sl
47、ed and the polyurethane cellular rubber mass and the coated fabric test specimen mass when using type B sled (expressed in g). For each direction, calculate the coefficient of dynamic friction (d) as the average of the value of the two specimens and calculate the differences between the mean value a
48、nd the values of the two test specimens. If the absolute value of a difference is strictly superior to 10% of the mean value, then test additional test specimens until an available difference is obtained. 10 Test report This test report shall include the following information: a) reference to this m
49、ethod of test, i.e. method EN 14882; b) identification of the sample; identification of the tested surface; identification of the relative orientations; c) date of the test; d) type of the sled used (type A sled and/or type B sled); e) coefficient of static friction (separately for each direction); f) coefficient of dynamic friction (separately for each direction); g) details of any deviation from the procedure. EN 14882:2005 (E) 10 Annex A (informative) Principle of the test method Key 1 Sensor 2 String 3 Pulley 4 Fl
