1、Designation: F 780 93a (Reapproved 2006)Standard Test Method forLinear Deformation and Breaking Strength of Alpine Skis1This standard is issued under the fixed designation F 780; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 Th
3、is test 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 and health practices and determine the applica-bility of reg
4、ulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3D 2240 Test Method for Rubber PropertyDurometerHardnessF 472 Terminology for Geometry of Alpine Skis3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 breaking load (FB)the maximum load applied inaccordan
5、ce 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 test method provides information
6、 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 adjustable supports, a load (F) appli
7、ca-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 testing machine with X Yrecorder (3)
8、 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 between supports andone support made
9、 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 (Section B), 25mm wide and of l
10、ength 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; seeTest Method D 2240) layer (4).The plate must be free to rotate under loading ram.6. Determination of Load Application Point6.1 In order to obtain comparable values,
11、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 accordance with the table shown
12、below:Ski Length, LN,mm (see Terminology F 472)Deflection,mmTolerance,mm1700 # LN2 0.031400 # LN 1700 4 0.031000 # LN 1400 6 0.030750 # LN 1000 8 0.037. Procedure7.1 Condition the ski for 24 h minimum at a temperature of23 6 5C. Place the ski as shown in Fig. 1, and set up thesystem to apply the loa
13、d 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 deflection by 25 6 5 mm/min, until the loaddeflection curve changes
14、 to a negative slope indicating failureof the ski.1This test method is under the jurisdiction of ASTM Committee F27 on SnowSkiing and is the direct responsibility of F27.30 on Skis and Boots.Current edition approved Oct. 1, 2006. Published December 2006. Originallyapproved in 1982. Last previous edi
15、tion approved in 1998 as F 780 93a (1998).2This test method is meant to conform in all meaningful ways to the ISOstandard 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
16、the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959
17、, United States.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 linear portion of theload-deflection diagram through that point on the abscissawhich equals a def
18、lection 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 the following information:9.1.1 This designation, ASTM F 780,9.1.2 Brand, model, manufacturers seria
19、l number, and sizeof ski, and9.1.3 Any deviation from the procedure and reasons there-fore.10. 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 biasbecaus
20、e the values for torsion characteristics of alpine skis aredefined only in terms of the test method.11. Keywords11.1 Alpine skis; breaking strength; Alpine skis; lineardeformation; Alpine skis; test methodsFIG. 1 Test System for Linear Deformation and Breaking Strength of Alpine SkisF 780 93a (2006)
21、2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, ar
22、e 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 revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standa
23、rdsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Commit
24、tee 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 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).FIG. 2 Load - Deflection DiagramF 780 93a (2006)3
