1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 5902:2013Alpine skis Determination ofelastic propertiesBS ISO 5902:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 5902:2013.Th
2、e UK participation in its preparation was entrusted to TechnicalCommittee SW/136/7, Snowsports equipment.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are
3、responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77189 7ICS 97.220.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStand
4、ards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate Text affectedBS ISO 5902:2013 ISO 2013Alpine skis Determination of elastic propertiesSkis alpins Dtermination des caractristiques lastiquesINTERNATIONAL STANDARDISO5902Second edition2013-03-01Reference number
5、ISO 5902:2013(E)BS ISO 5902:2013ISO 5902:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including ph
6、otocopying, 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 officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09
7、47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 5902:2013ISO 5902:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Apparatus . 25 Sampling and conditioning 46 Procedure. 46.1 Determination of centre
8、 spring constant, cM.46.2 Determination of shovel spring constant, cS56.3 Determination of rear spring constant, cR.66.4 Determination of spring constant balance, B (forebody and afterbody spring constants).66.5 Determination of forebody torsional spring constant, cTB, and afterbody torsional spring
9、 constant, cTA.77 Expression of results 88 Tolerances . 89 Test report . 9BS ISO 5902:2013ISO 5902:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norm
10、ally 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 that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in t
11、he work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare I
12、nternational Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of
13、 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.ISO 5902 was prepared by Technical Committee ISO/TC 83, Sports and recreational equipment, Subcommittee SC 4, Snowsports equipment.This second edition c
14、ancels and replaces the first edition (ISO 5902:1980), which has been technically revised.iv ISO 2013 All rights reservedBS ISO 5902:2013INTERNATIONAL STANDARD ISO 5902:2013(E)Alpine skis Determination of elastic properties1 ScopeThis International Standard specifies laboratory measurement methods t
15、o determine the elastic properties of alpine skis. Its purpose is to calculate the resistance of defined parts of the ski to bending and torsion.The standard measurement procedures are recommended in order to ensure comparability between laboratory measurement data determined and published by ski ma
16、nufacturers, institutions and others. In this International Standard no attempt is made to relate the measurement data to the quality of the ski.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application.
17、For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6289, Skis Vocabulary3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1spring consta
18、ntcratio of the force F applied to the ski, to the corresponding deflection f:cFf= Note 1 to entry: Depending on the individual parts of the ski on which the force F is applied, one can define: the centre spring constant, cM; the shovel spring constant, cS; the rear spring constant, cR; the afterbod
19、y spring constant, cA; the forebody spring constant, cB.Note 2 to entry: See Figure 1. ISO 2013 All rights reserved 1BS ISO 5902:2013ISO 5902:2013(E)KeyA afterbody spring bending lineB forebody spring bending lineM centre spring bending lineR rear spring bending lineS shovel spring bending lineFigur
20、e 1 Indices for spring constants3.2spring constant balanceBratio of the afterbody spring constant, cA, to the forebody spring constant, cBBcc=AB3.3torsional spring constantcTratio of the torque applied to the ski to the corresponding torsion angle cMT=4 Apparatus4.1 The apparatus for measuring the c
21、entre spring constant shall consist of the following items.4.1.1 Two adjustable supports with low-friction rollers of 20 mm diameter and wide enough to ensure that the test ski can be supported on its whole width. One of the supports with low-friction rollers has a device for clamping the end of the
22、 ski.4.1.2 A load application device with an accuracy of 2 N for application of the test force FMmid-way between the supports, which are placed at a distance that is adjustable between 1 200 and 1 720 mm, by means of a contact ram with a radius of 10 mm and a width touching the whole width of the te
23、st ski.4.1.3 A linear measuring device for measuring the deflection f with an accuracy of 0,5 mm.2 ISO 2013 All rights reservedBS ISO 5902:2013ISO 5902:2013(E)4.2 The apparatus for measuring the shovel, rear, afterbody and forebody spring constants shall consist of the following items.4.2.1 A clampi
24、ng device, consisting of a flat jaw and three clamps, ensuring that the whole width of the ski can be clamped (see Figure 2).4.2.2 A load application device with an accuracy of 2 N for application of the test forces FS, FR, FAor FBat a distance that is adjustable between 330 mm and 860 mm from the e
25、dge of the flat jaw of the clamping device by means of a low-friction roller of 20 mm diameter and wide enough to touch the whole width of the test ski.4.2.3 A linear measuring device as specified in 4.1 c).Dimensions in millimetres123 Key1 clamps2 test ski3 flat jawFigure 2 Clamping device for bend
26、ing and torque tests of alpine ski Minimal dimensions4.3 The apparatus for measuring the torsional spring constant shall consist of the following items.4.3.1 A clamping device as specified in 4.2 a) and shown in Figure 2.4.3.2 A torsion head of low friction with an accuracy of 2 Nm for application o
27、f the torque M at a distance, adjustable between 610 mm and 860 mm from the edge of the flat jaw of the clamping device. The clamping device of the torsion head holds the running surface at the same level as the clamping device of the centre of the ski (see Figure 3).4.3.3 A scale to read the torsio
28、n angle with an accuracy of 0,5. ISO 2013 All rights reserved 3BS ISO 5902:2013ISO 5902:2013(E)12Key1 test ski2 ski axis3 width of skiFigure 3 Torsion head for the torque test of alpine ski5 Sampling and conditioningAll measurements according to this International Standard shall be taken from a fini
29、shed ski without any mounted parts.lt is recommended that one of the following sizes of ski be used:150, 180 or 200 cm.From these three sizes shall be selected the size that is nearest in length to the model that is submitted for testing.Before testing, the test ski shall be conditioned for at least
30、 2 h at a temperature of 23 C 5 C.6 Procedure6.1 Determination of centre spring constant, cMDetermine the nominal length, LN, in accordance with ISO 6289. Place the ski on two supports set at a distance of LN 280 mm using the apparatus specified in 4.1 and clamp at a distance of 50 mm from the end o
31、f the ski (see Figure 4). It is allowed for certain models to change the 50 mm and this shall be mentioned in the test report.4 ISO 2013 All rights reservedBS ISO 5902:2013ISO 5902:2013(E)Dimensions in millimetresKey1 clamping deviceFigure 4 Determination of centre spring constant, cMApply a pre-loa
32、d of 20 N. Load the ski quasi-statically with the rate of deflection less than 20 mm/min, with a test load of FM= 300 N. Read the deflection, fM, in millimetres, caused by the test load, FM, within 2 s to 5 s after the test load has been applied.6.2 Determination of shovel spring constant, cSClamp t
33、he ski in the apparatus specified in 4.2 at a projected distance of 120 mm between ski tip and load application roller, after having set a distance of 0,3 LN 120 mm between the clamping device and the load application roller, as shown in Figure 5. It is allowed for certain models to change the 120 m
34、m and this shall be mentioned in the test report.Dimensions in millimetresFigure 5 Determination of shovel spring constant, cSApply a pre-load of 20 N. Load the ski quasi-statically, with the rate of deflection less than 20 mm/min, with a test load of FS= 150 N. If the deflection is more than 50 mm,
35、 the load should be reduced to 100 N. Read the deflection, fS, in millimetres, caused by the test load FS, within 2 s to 5 s after the test load has been applied. ISO 2013 All rights reserved 5BS ISO 5902:2013ISO 5902:2013(E)6.3 Determination of rear spring constant, cRClamp the ski in the apparatus
36、 specified in 4.2 at a projected distance of 10 mm between the ski tail and the load application roller, after having set a distance of 0,3 LN 120 mm between the clamping device and the load application roller, as shown in Figure 6. It is allowed for certain models to change the 10 mm and this shall
37、 be mentioned in the test report. For a ski with high tail turn up, the load application point is found by determining the point of the running surface which is 5 mm above a flat standing surface and 10 mm forward from that point.Dimensions in millimetresFigure 6 Determination of rear spring constan
38、t, cRApply a pre-load of 20 N. Load the ski quasi-statically with the rate of deflection less than 20 mm/min, with a test load of FS= 150 N. If the deflection is more than 50 mm, the load should be reduced to 100 N. Read the deflection fR, in millimetres, caused by the test load FRwithin 2 s to 5 s
39、after the test load has been applied.6.4 Determination of spring constant balance, B (forebody and afterbody spring constants)Make two bending tests, loading first the afterbody and then the forebody of the ski. Use the apparatus specified in 4.2, setting the clamping device and the load application
40、 roller at a distance of 0,5 LN 140 mm. The clamping point for the afterbody spring constant as well as for the forebody spring constant shall be 0,5 LN 140 mm + 50 mm from the ski tail (see Figure 7). Mount the ski on the clamping device in such a way that the ski afterbody or ski forebody can be b
41、ent freely from the clamping point. It is allowed for certain models to change the 50 mm and this shall be mentioned in the test report.6 ISO 2013 All rights reservedBS ISO 5902:2013ISO 5902:2013(E)Dimensions in millimetresFigure 7 Determination of spring constant balance, B (forebody and afterbody
42、spring constants)Apply a pre-load of 20 N. Load the ski quasi-statically with the rate of deflection less than 20 mm/min, with a test load of FAor FB= 50 N. Read the deflection fAor fScaused by the test load FAor FBwithin 2 s to 5 s after the test load has been applied.6.5 Determination of forebody
43、torsional spring constant, cTB, and afterbody torsional spring constant, cTAUse the apparatus specified in 4.3, setting a distance of 0,5 LN 140 mm between the clamping device and the torsion head. Clamp the ski in the measurement device as shown in Figure 8. The axis of the ski shall be in the cent
44、re of the torsion head. ISO 2013 All rights reserved 7BS ISO 5902:2013ISO 5902:2013(E)Dimensions in millimetresFigure 8 Determination of forebody torsional spring constant, cTB, and afterbody torsional spring constant, cTAApply a torque quasi-statically with the rate of deflection less than 20 mm/mi
45、n, (in the case of very stiff skis a torque of 20 Nm is recommended if the torsion angle is less than 5). Read the torsion angle within 2 s to 5 s after the torque has been applied.7 Expression of resultsFor each property, calculate the single results of three tests, in accordance with Clause 3, rec
46、ording their mean. Recommended units are given in Table 1.Table 1 Recommended unitsCharacteristic UnitSpring constant, c N/mmTorsional spring constant, cTNm/8 TolerancesIf data are published by the manufacturer with reference to this International Standard, the following tolerances shall be observed
47、: spring constant 10 % torsional spring constant 10 %8 ISO 2013 All rights reservedBS ISO 5902:2013ISO 5902:2013(E)9 Test reportThe test report shall include the following particulars:a) reference to this International Standard, i.e. ISO 5902;b) name or trademark of the manufacturer;c) model designa
48、tion;d) nominal length;e) manufacturers registration number;f) test results;g) any deviation from this International Standard with an explanation of the reason for the deviation. ISO 2013 All rights reserved 9BS ISO 5902:2013ISO 5902:2013(E) ISO 2013 All rights reservedICS 97.220.20Price based on 9
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