ASTM F1722-15(R2021) pdf free download

ASTM F1722-15(R2021) pdf free download.Standard Test Method for Determining Mass and Moment of Inertia of Alpine Skis
1. Scope
1.1 This test method covers test measurement methods for mass and moment of inertia of adult Alpine skis. 2 1.2 No limitation to ski size is proposed. This test method is applicable to all adult Alpine skis. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Apparatus
5.1 Weighing Device, accurate to 60.02 kg. 5.2 Fulcrum, for locating the center of gravity of the ski. 5.3 Time Measurement Device (stopwatch), accurate to at least 0.1 s. 5.4 Measuring Device, in accordance with Fig. 1, consisting of the following parts: 5.4.1 Clamping Device, A, consisting of two clamping fixtures. The top clamping fixture has a hole with a mark to locate the center of gravity and two additional holes at a distance, d f , from the center mark for fixation of the filaments, B. The recommended dimension for d f is 75 mm, and the mass of the clamping device shall be less than 0.1 kg. 5.4.2 Top Plate, C, with two holes separated by the distance 2d f for the fixation of filaments, B. The plate, C, shall be fixed on a stiff, horizontal beam. 5.4.3 Two Filaments, B, with equal lengths, l, that connect the top plate with the clamping device. The ratio d f :l shall be approximately 1:40. With the recommended dimension d f = 75 mm, and the length, l = 1000 mm. The filaments shall be made of materials with low elongation and high strength (for example, tennis racket string and fishing line). The diameter of the filaments shall be not more than 1.0 mm.
6. Sampling and Conditioning
6.1 In order to ensure comparability, it is recommended that one of the following ski sizes be used if the data measured are to be published: 150, 165, or 185 cm. The ski size, measured by chord length (see Terminology F472 for the definition of chord length), should be within 3 cm of the value chosen. From these three sizes, choose the one that is most representative of the tested model. 6.2 All measurements shall be taken from a finished, manu- factured ski without any mounted parts. 6.3 All measurements shall be taken from a ski that has been conditioned in a standard atmosphere 20/65 (ISO 554) (that is, the ski shall be placed in this atmosphere for at least 24 h prior to measurements being taken).
7. Calibration of Measuring Device
7.1 Differences in construction between the different mea- suring devices can lead to different measurement results, which deviate from the theoretical value of the polar moment of inertia. In order to reduce such deviations, it is recommended that a test equipment validation factor, c, be determined for each measuring device. 7.2 The test equipment validation factor is determined from the ratio of the calculated moment of inertia to the measured moment of inertia of a bar of steel with dimensions 1 to 8 by 20 to 30 by 1200 to 1700 mm. To ensure accurate measurements, it is important that the steel bar be level when placed in the test device. Any vertical displacement of the steel bar may alter calculation of the test device evaluation factor.