DIN ISO 6266-2013 Alpine skis - Determination of fatigue indexes - Cyclic loading test (ISO 6266 2013)《高山雪撬 疲劳指数的测定 循环载荷试验(ISO 6266-2013)》.pdf

1、September 2013Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC

2、S 97.220.20!%(%“2056102www.din.deDDIN ISO 6266Alpine skis Determination of fatigue indexes Cyclic loading test (ISO 6266:2013),English translation of DIN ISO 6266:2013-09Alpinski Bestimmung von Ermdungskennwerten Zyklische Biegebeanspruchung (ISO 6266:2013),Englische bersetzung von DIN ISO 6266:2013

3、-09Skis alpins Dtermination des indices de fatigue Essai en flexion alterne (ISO 6266:2013),Traduction anglaise de DIN ISO 6266:2013-09SupersedesDIN ISO 6266:1981-03www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 12 pages08.13 A comma i

4、s used as the decimal marker. Contents Page National foreword .3 National Annex NA (informative) Bibliography .4 Introduction .5 1 Scope .6 2 Normative references .6 3 Terms and definitions 6 4 Principle .7 5 Apparatus 7 5.1 Bending machine 7 5.2 Measuring device for bottom camber height .9 5.3 Meas

5、uring device for centre spring constant 9 6 Test specimens .9 6.1 Lengths 9 6.2 Number . 10 7 Temperatures for conditioning and testing 10 8 Procedure . 10 8.1 Measurement of original bottom camber height, hB10 8.2 Measurement of original centre spring constant, cM. 10 8.3 Determination. 10 8.4 Meas

6、urement of final bottom camber height, hB11 8.5 Measurement of final centre spring constant, cM. 11 8.6 Assessment of damage . 11 9 Expression of results . 11 9.1 Fatigue index for bottom camber height 11 9.2 Fatigue index for centre spring constant . 11 10 Test report 12 2DIN ISO 6266:2013-09 Natio

7、nal foreword This standard includes safety requirements within the meaning of the Produktsicherheitsgesetz (ProdSG) (German Product Safety Act). This document (ISO 6266:2013) has been prepared by Technical Committee ISO/TC 83/SC 4 “Snowsports equipment”. The responsible German body involved in its p

8、reparation was the Normenausschuss Sport- und Freizeitgert, Working Committee NA 112-03-01 AA Ski- und Snowboardsportgerte. Where this standard has been identified by the Ausschuss fr Produktsicherheit (German Committee for Product Safety) and reference to it has been published in the Gemeinsames Mi

9、nisterialblatt (German Joint Ministerial Gazette) by the Bundesanstalt fr Arbeitsschutz und Arbeitsmedizin (BAuA) (German Federal Institute for Occupational Safety and Health), it is to be presumed that alpine skis which comply with this standard fulfil the relevant health and safety requirements. W

10、here they comply with the provisions laid down in Section 5 of the Product Safety Act, such products may then be marked with the GS mark (German “safety tested” mark) as awarded to the manufacturer by an authorized “GS organization”. The DIN Standards corresponding to the International Standards ref

11、erred to in this document are as follows: ISO 5902 DIN ISO 5902ISO 6289 DIN ISO 6289 Amendments This standard differs from DIN ISO 6266:1981-03 as follows: a) normative references have been updated; b) the classification in skis for children, juniors and adults has been deleted; c) the standard has

12、been editorially revised. Previous editions DIN ISO 6266: 1981-03 3DIN ISO 6266:2013-09 National Annex NA (informative) Bibliography DIN ISO 5902, Alpine skis Determination of elastic properties DIN 6289, Skis Vocabulary 4DIN ISO 6266:2013-09 IntroductionPrevious investigations showed that the fatig

13、ue of an alpine ski is not easy to describe. If one understands by fatigue the remaining negative change of some characteristics of the ski, influencing the performance of the ski, as a result of normal use, several tests would be necessary to determine exactly the susceptibility of a ski to such ch

14、anges. In addition, some factors may have substantial influence on the results such as ski length, spring constant, test temperature, kind of vibration, frequency etc. lt was therefore decided that a test method taking account of all these factors might be of some interest for ski research but that

15、it should not be proposed for standardization.Instead of this, a simplified test of the fatigue behaviour of two important characteristics of the ski (i.e. of camber height and centre spring constant) was proposed for standardization.5DIN ISO 6266:2013-09 1 ScopeThis International Standard specifies

16、 a method for the determination of the fatigue indexes of alpine skis (i.e. the resistance of the skis to changes in shape and of stiffness) after a bending test with cyclic loading.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and ar

17、e 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 5902, Alpine skis Determination of elastic propertiesISO 6289, Skis Vocabulary3 Terms and definition

18、sFor the purposes of this document, the following terms and definitions apply.3.1camber heighthkdistance between the running surface on the ski and a planar surface, measured with the ski resting freely under its own mass3.2original weighted bottom camber heighthBweighted bottom camber height, accor

19、ding to ISO 6289, determined prior to the test3.3final weighted bottom camber heighthBweighted bottom camber height, according to ISO 6289, determined after the test3.4spring constantcratio of the force F applied to the ski, to the corresponding deflection f:cFf= Note 1 to entry: Depending on the in

20、dividual 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 afterbody spring constant, cA; the forebody spring constant, cB.6DIN ISO 6266:2013-09 3.5final centre spring constantcMcentre s

21、pring constant, according to ISO 5902, measured after the test3.6fatigue index for the bottom camber heightKhpercentage change of bottom camber height of the ski after cyclic loading and recovery3.7fatigue index for the centre spring constantKcpercentage change of centre spring constant of the ski a

22、fter cyclic loading and recovery3.8stroke lengthsdeflection of the ski during cyclic loading measured from a straight line through the supports, midway between the two supports3.9frequencynumber of deflections of the ski per secondNote 1 to entry: The unit is the Hertz (Hz).3.10recovery timetime bet

23、ween the test and the measurement of hB, (see 3.3) and cM(see 3.5), which is necessary to eliminate temporary changes in camber height and centre spring constant4 PrincipleSubjection of the ski to cyclic loading and recovery. Determination of the fatigue indexes by calculation of the percentage perm

24、anent change in:a) bottom camber height;b) centre spring constant.5 Apparatus5.1 Bending machineThe bending machine shall essentially be constructed as shown in Figure 1. The machine has two supports which are vertically and horizontally adjustable. The supports of the bending machine are arranged a

25、t a distance of LS= LN 280 mm where LNis the nominal length. Nominal length shall be determined in accordance with ISO 6289. The support rolls shall have a diameter of approximately 50 mm. The supports shall have a spring loaded clamping roll in order to prevent lifting of the ski.The driving mechan

26、ism consists of a disk fly wheel with adjustable crank pin, a connecting rod and a push rod with clamping fixture. The disk fly wheel shall have sufficient mass and driving power to effect a smooth sinusoidal flexing. The distance between crank pin and rotation axis shall be adjustable in order to b

27、e able to adjust a constant test load FTby changing the stroke length s as indicated in 8.3.7DIN ISO 6266:2013-09 Dimensions in millimetresKeyLSsupport lengthLNnominal lengthsstroke lengthFigure 1 Bending machineThe frequency of the stroke shall be between 2 Hz and 3 Hz. The clamping fixture shall h

28、ave a pivoting joint and jaws with elastic rubber layers, as shown in Figure 2, in order to avoid stress concentration at the clamping point of the ski.8DIN ISO 6266:2013-09 Dimensions in millimetres12404 1Key1 rubber2 skiFigure 2 Clamping fixtureThe dimensions of the rubber layers shall be as follo

29、ws:thickness: 4 mm 1 mmwidth: 40 mmhardness: (95 5) Shore AIn addition, a counter shall be fixed to the push rod in order to record the number of cycles.5.2 Measuring device for bottom camber heightFor measuring the bottom camber height, a flat surface plate and a dial indicator with indicator holde

30、r are required.5.3 Measuring device for centre spring constantFor measuring the centre spring constant, a device as described in ISO 5902 is required.6 Test specimens6.1 LengthsTo ensure the comparability of the published test results, the following ski lengths shall be used for tests:1 800 mm or 2

31、000 mm1 600 mm1 300 mm9DIN ISO 6266:2013-09 6.2 NumberThe test shall be carried out on 10 skis of the same type.7 Temperatures for conditioning and testingThe fatigue properties of the ski as described in this lnternational Standard can be affected by the test temperature to a greater or lesser exte

32、nt, depending on the particular material configuration of the ski. Therefore, two different test temperatures are specified: A, standard laboratory test: 23 C 2 C; B, cold chamber test: 5 C 2 C.All measurements shall be carried out on a ski conditioned to the test temperature for at least 2 h.8 Proc

33、edure8.1 Measurement of original bottom camber height, hBMeasure the original bottom camber height hBprior to the bending by cyclic loading. Press the ski against the flat surface plate (see 5.2). Place the dial indicator at the measurement point on the top surface of the ski and set to zero. Remove

34、 the flatting load, and read the bottom camber height from the dial indicator to an accuracy of 0,03 mm.8.2 Measurement of original centre spring constant, cMMeasure the original spring constant cMprior to the bending with cyclic loading, in accordance with ISO 5902, to an accuracy of 0,2 N/mm.8.3 D

35、eterminationPlace the ski in the bending machine (see 5.1) and adjust the supports in such a way that the connecting line between the upper points of the lower support rolls and the surface of the clamping jaws, touching the running surface of the ski, is a straight line, when the push rod is in the

36、 upper dead centre.Adjust the stroke length s by shifting the crank pin to its proper position. The stroke length, expressed in millimetres, is calculated from the following formula:sFc=TMwhereFTis the test load, in newtons;cMis the original centre spring constant, in newtons per millimetre.The perm

37、issible tolerance for stroke length is 2,5 mm.The following loads shall be used:1 800 mm or 2 000 mm: 450 N1 600 mm: 350 N10DIN ISO 6266:2013-09 1 300 mm: 250 NSubject the ski to 20 000 loading cycles at a frequency of 2 Hz to 3 Hz.Remove the ski from the machine and place against a wall in a vertic

38、al and stress-free (relaxed) position. The recovery time for the elimination of temporary deformation is 24 h.8.4 Measurement of final bottom camber height, hBMeasure the bottom camber height hBafter the recovery time as specified in 8.1.8.5 Measurement of final centre spring constant, cMMeasure the

39、 centre spring constant cMafter the recovery time as specified in 8.2.8.6 Assessment of damageVisually inspect the ski for damage caused by the test (for example, cracks or stress marks in the surface of the material, cracks at steel edges, delaminations).9 Expression of results9.1 Fatigue index for

40、 bottom camber heightThe fatigue index Khfor the bottom camber height of the ski, expressed as a percentage, is given by the formulaKhhhhBBB=100 wherehBis the original camber height, measured in accordance with 8.1;hBis the final camber height, measured in accordance with 8.4.Express the result as t

41、he mean of the 10 determinations.9.2 Fatigue index for centre spring constantThe fatigue index Kcfor the centre spring constant of the ski, expressed as a percentage, is given by the formulaKcccc=MMM100 wherecMis the original centre spring constant, measured in accordance with 8.2;cMis the final cen

42、tre spring constant, measured in accordance with 8.5.Express the result as the mean of the 10 determinations.11DIN ISO 6266:2013-09 10 Test reportThe test report shall include the following particulars:a) reference to this International Standard, i.e. ISO 6266;b) complete identification of the ski (

43、brand, model designation, nominal length and manufacturers registration number);c) test temperature (A or B);d) fatigue index far the bottom camber height;e) fatigue index for the centre spring constant;f) damage to the ski caused by the test with exact description;g) any deviation from this International Standard with an explanation of the reason for the deviation.12DIN ISO 6266:2013-09