1、Designation: F780 93a (Reapproved 2018)Standard Test Method forLinear Deformation and Breaking Strength of Alpine Skis1This standard is issued under the fixed designation F780; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the ye
2、ar of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of lineardeformation load and breaking load for Alpine skis.21.2 This test
3、 method is applicable to all Alpine skis.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicabili
4、ty of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the Wor
5、ld Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3D2240 Test Method for Rubber PropertyDurometer Hard-nessF472 Terminology for Geometry of Alpine Skis3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 breaking load (FB)the
6、 maximum load applied inaccordance with Sections 6 and 7 (that is, the maximum loadwhich the ski can sustain).3.1.2 deformation load (FD)the load applied in accor-dance with Section 6 that causes a permanent deformation of 1mm at the load application point of the ski.4. Significance and Use4.1 This
7、test method provides information concerning theresistance of a ski to permanent bending and an indication of itsbasic strength. It is not intended to evaluate the data withregard to the quality of the ski.5. Apparatus5.1 This test method shall be conducted on a device (seeFig. 1) equipped with adjus
8、table supports, a load (F) applica-tion system (1) with a range of at least 20 000 N and readingaccuracy of 650 N, and with an instrument (2) for readingbending deformation (d) with an accuracy of 0.01 mm. Thesystem must have a controlled deflection rate. A standarduniversal tension/compression test
9、ing machine with X Yrecorder (3) is typical of such a system.5.2 The test method is made with the ski in its normalhorizontal position, and the overhanging portions of the ski areleft free to deflect.5.3 The test system shall be set up in accordance with Fig.1 (Section A) with a 250-mm distance betw
10、een supports andone support made with a 25-mm diameter, low-friction roller atpoint of contact with the ski. The end support shall be sodesigned as to have a hinged clamp which prohibits lineardisplacement, yet permits rotation about the support. The loadis applied through a plate as shown in Fig. 1
11、 (Section B), 25mm wide and of length equal to or slightly greater than thewidth of the ski, made up of a steel plate (5) and a hard rubber(95 6 5 ShoreAdurometer; see Test Method D2240) layer (4).The plate must be free to rotate under loading ram.6. Determination of Load Application Point6.1 In ord
12、er to obtain comparable values, the test shall beconducted at the load application point with a separationbetween the supports of 250 6 0.5 mm. Determine the loadapplication point by moving the ski in a longitudinal directionon the supports until a deflection is obtained under a load of600 6 5 N in
13、accordance with the table shown below:Ski Length, LN,mm (see Terminology F472)Deflection,mmTolerance,mm1700 # LN2 0.031400 # LN 1700 4 0.031000 # LN 1400 6 0.030750 # LN 1000 8 0.031This test method is under the jurisdiction of ASTM Committee F27 on Snowand Water Sports and is the direct responsibil
14、ity of F27.30 on Skiing andSnowboarding Equipment.Current edition approved July 1, 2018. Published August 2018. Originallyapproved in 1982. Last previous edition approved in 2012 as F780 93a (2012).DOI: 10.1520/F0780-93AR18.2This test method is meant to conform in all meaningful ways to the ISOstand
15、ard ISO/DIS 6265, available from American National Standards Institute(ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards v
16、olume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on st
17、andardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.17. Procedure7.1 Condition the ski for 24 h minimum at a temperature of23 6 5C. Place t
18、he ski as shown in Fig. 1, and set up thesystem to apply the load midway between the supports. Thestiffness of the ski at point of loading must be within the 3 %tolerance under a load of 600 6 5 N; noncomparable informa-tion will result otherwise. Load the ski at a rate sufficient toincrease the def
19、lection by 25 6 5 mm/min, until the loaddeflection curve changes to a negative slope indicating failureof the ski.8. Interpretation of Results8.1 The test data obtained from a load-deflection diagram isshown in Fig. 2. The deformation load, FD, is determined bydrawing a straight line parallel to the
20、 linear portion of theload-deflection diagram through that point on the abscissawhich equals a deflection of 1.0 mm. The intersection of thatline with the load-deflection curve determines the deformationload FD. The maximum load on the diagram is defined as thebreaking load FB.9. Report9.1 Report th
21、e following information:9.1.1 This designation, ASTM F780,9.1.2 Brand, model, manufacturers serial number, and sizeof ski, and9.1.3 Any deviation from the procedure and reasons there-fore.FIG. 1 Test System for Linear Deformation and Breaking Strength of Alpine SkisFIG. 2 Load - Deflection DiagramF7
22、80 93a (2018)210. Precision and Bias10.1 PrecisionIt is not practical to specify the precision ofthe procedure in this test method because the test is destructive.10.2 BiasThe procedure in this test method has no biasbecause the values for torsion characteristics of alpine skis aredefined only in te
23、rms of the test method.11. Keywords11.1 Alpine skis; breaking strength; Alpine skis; lineardeformation; Alpine skis; test methodsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard ar
24、e expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not
25、revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which yo
26、u may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United
27、 States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 93a (2018)3
