1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 5902:2013 Alpine skis Determination of elastic propertiesBS ISO 5902:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 5902:
2、2013. The UK participation in its preparation was entrusted to Technical Committee SW/136/7, Snowsports equipment. 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 contrac
3、t. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 77189 7 ICS 97.220.20 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the a
4、uthority of the Standards Policy and Strategy Committee on 30 April 2013. Amendments issued since publication Date Text affectedBS ISO 5902:2013 ISO 2013 Alpine skis Determination of elastic properties Skis alpins Dtermination des caractristiques lastiques INTERNATIONAL STANDARD ISO 5902 Second edit
5、ion 2013-03-01 Reference number ISO 5902:2013(E)BS ISO 5902:2013ISO 5902:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, elec
6、tronic or mechanical, including photocopying, 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 office Case postale 56 CH-1211 Geneva 20 Tel.
7、 + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 5902:2013ISO 5902:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Apparatus . 2 5 Sampling and condit
8、ioning 4 6 Procedure. 4 6.1 Determination of centre spring constant, c M. 4 6.2 Determination of shovel spring constant, c S5 6.3 Determination of rear spring constant, c R. 6 6.4 Determination of spring constant balance, B (forebody and afterbody spring constants). 6 6.5 Determination of forebody t
9、orsional spring constant, c TB , and afterbody torsional spring constant, c TA. 7 7 Expression of results 8 8 Tolerances . 8 9 Test report . 9BS ISO 5902:2013ISO 5902:2013(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
10、 member bodies). The work of preparing International Standards is normally 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, gover
11、nmental and non-governmental, in liaison with ISO, also take part in the 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 D
12、irectives, Part 2. The main task of technical committees is to prepare International 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
13、bodies casting a vote. Attention is drawn to the possibility that some of 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 recreationa
14、l equipment, Subcommittee SC 4, Snowsports equipment. This second edition cancels and replaces the first edition ( ISO 5902:1980), which has been technically revised.iv ISO 2013 All rights reservedBS ISO 5902:2013INTERNATIONAL ST ANDARD ISO 5902:2013(E) Alpine skis Determination of elastic propertie
15、s 1 Scope T his Int er nat iona l St a nda rd spec i f ies laborat or y mea su rement met hod s t o det er mine t he ela s t ic proper t ies 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 recommen
16、ded in order to ensure comparability between laboratory measurement data determined and published by ski manufacturers, institutions and others. In this International Standard no attempt is made to relate the measurement data to the quality of the ski. 2 Normative references The following documents,
17、 in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 Vocabulary 3 T e
18、rms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 spring constant c ratio of the force F applied to the ski, to the corresponding deflection f: Note 1 to entry: Depending on the individual parts of the ski on which the force F is applied, one can
19、 define: the centre spring constant, c M ; the shovel spring constant, c S ; the rear spring constant, c R ; the afterbody spring constant, c A ; the forebody spring constant, c B . Note 2 to entry: See Figure 1. ISO 2013 All rights reserved 1BS ISO 5902:2013ISO 5902:2013(E) Key A afterbody spring b
20、ending line B forebody spring bending line M centre spring bending line R rear spring bending line S shovel spring bending line Figure 1 Indices for spring constants 3.2 spring constant balance B ratio of the afterbody spring constant, c A , to the forebody spring constant, c B 3.3 torsional spring
21、constant c T ratio of the torque applied to the ski to the corresponding torsion angle T 4 Apparatus 4.1 The apparatus for measuring the centre 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 th
22、at 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 ski. 4.1.2 A load application device with an accuracy of 2 N for application of the test force F Mmid-way between the supports, which are placed at a distance t
23、hat 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 test 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
24、) 4.2 The apparatus for measuring the shovel, rear, afterbody and forebody spring constants shall consist of the following items. 4.2.1 A clamping 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 devic
25、e with an accuracy of 2 N for application of the test forces F S , F R , F Aor F Bat a distance that is adjustable between 330 mm and 860 mm from the edge 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 s
26、ki. 4.2.3 A linear measuring device as specified in 4.1 c). Dimensions in millimetres 1 2 3 Key 1 clamps 2 test ski 3 flat jaw Figure 2 Clamping device for bending and torque tests of alpine ski Minimal dimensions 4.3 The apparatus for measuring the torsional spring constant shall consist of the fol
27、lowing 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 of 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 dev
28、ice 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 torsion angle with an accuracy of 0,5. ISO 2013 All rights reserved 3BS ISO 5902:2013ISO 5902:2013(E) 1 2 Key 1 test ski 2 ski axis 3 width of
29、 ski Figure 3 Torsion head for the torque test of alpine ski 5 Sampling and conditioning All measurements according to this International Standard shall be taken from a finished ski without any mounted parts. lt is recommended that one of the following sizes of ski be used: 150, 180 or 200 cm. From
30、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 2 h at a temperature of 23 C 5 C. 6 Procedure 6.1 Determination of centre spring constant, c M Determine the nominal lengt
31、h, L N , in accordance with ISO 6289. Place the ski on two supports set at a distance of L N 280 mm using the apparatus specified in 4.1 and clamp at a distance of 50 mm from the end of the ski (see Figure 4). It is allowed for certain models to change the 50 mm and this shall be mentioned in the te
32、st report.4 ISO 2013 All rights reservedBS ISO 5902:2013ISO 5902:2013(E) Dimensions in millimetres Key 1 clamping device Figure 4 Determination of centre spring constant, c M 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
33、F M= 300 N. Read the deflection, f M , in millimetres, caused by the test load, F M , within 2 s to 5 s after the test load has been applied. 6.2 Determination of shovel spring constant, c S Clamp the ski in the apparatus specified in 4.2 at a projected distance of 120 mm between ski tip and load ap
34、plication roller, after having set a distance of 0,3 L N 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 mm and this shall be mentioned in the test report. Dimensions in millimetres Figure 5 Determination of
35、 shovel spring constant, c S 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 F S= 150 N. If the deflection is more than 50 mm, the load should be reduced to 100 N. Read the deflection, f S , in millimetres, caused by the t
36、est load F S , 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, c R Clamp the ski in the apparatus specified in 4.2 at a projected distance of 10 mm between the ski tail and the load appl
37、ication roller, after having set a distance of 0,3 L N 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 be mentioned in the test report. For a ski with high tail turn up, the load application
38、 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 millimetres Figure 6 Determination of rear spring constant, c R Apply a pre-load of 20 N. Load the ski quasi-statically with the rate of deflec
39、tion less than 20 mm/min, with a test load of F S= 150 N. If the deflection is more than 50 mm, the load should be reduced to 100 N. Read the deflection f R , in millimetres, caused by the test load F Rwithin 2 s to 5 s after the test load has been applied. 6.4 Determination of spring constant balan
40、ce, 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 roller at a distance of 0,5 L N 140 mm. The clamping point for the afterbody
41、spring constant as well as for the forebody spring constant shall be 0,5 L N 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 bent freely from the clamping point. It is allowed for certain models to chan
42、ge 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 millimetres Figure 7 Determination of spring constant balance, B (forebody and afterbody spring constants) Apply a pre-load of 20 N. Load the ski quasi-statically
43、with the rate of deflection less than 20 mm/min, with a test load of F Aor F B= 50 N. Read the deflection f Aor f Scaused by the test load F Aor F Bwithin 2 s to 5 s after the test load has been applied. 6.5 Determination of forebody torsional spring constant, c TB , and afterbody torsional spring c
44、onstant, c TA Use the apparatus specified in 4.3, setting a distance of 0,5 L N 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 centre of the torsion head. ISO 2013 All rights reserved 7BS ISO
45、5902:2013ISO 5902:2013(E) Dimensions in millimetres Figure 8 Determination of forebody torsional spring constant, c TB , and afterbody torsional spring constant, c TA Apply a torque quasi-statically with the rate of deflection less than 20 mm/min, (in the case of very stiff skis a torque of 20 Nm is
46、 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 results For each property, calculate the single results of three tests, in accordance with Clause 3, recording their mean. Recommended units are given in Tab
47、le 1. Table 1 Recommended units Characteristic Unit Spring constant, c N/mm Torsional spring constant, c T Nm/ 8 Tolerances If data are published by the manufacturer with reference to this International Standard, the following tolerances shall be observed: spring constant 10 % torsional spring const
48、ant 10 %8 ISO 2013 All rights reservedBS ISO 5902:2013ISO 5902:2013(E) 9 Test report The 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 designation; d) nominal length; e) manufacturer
49、s 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 reserved IC S 97.220.20 Price based on 9 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications, informat
