ASTM F1888-2002 Test Method for Compression-Displacement of Baseballs and Softballs《棒球和垒球受压位移的试验方法》.pdf
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1、Designation: F 1888 02An American National StandardTest Method forCompression-Displacement of Baseballs and Softballs1This standard is issued under the fixed designation F 1888; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear 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 describes a comparative measurementmethod for baseballs and softballs as defined by a staticc
3、ompression displacement test.1.2 This test method is based on a slow rate force-displacement measurement.1.3 This procedure is for baseballs and softballs meetingstandards established by the sports governing bodies.NOTE 1Since the compression-displacement of baseballs and soft-balls can influence th
4、e performance characteristics, this test provides asimple method to compare and categorize such balls based on force levelsin a standardized compression-displacement test.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility
5、 of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 baseballs and softballs, nany such ball defined bythe rules of the game a
6、s published by the sports governingbodies.2.1.2 compression-displacement, nthe reduction in balldiameter under a specified compressive load between two flatplates. Synonymous with compression-deflection.2.1.3 force, nthe resistance to displacement. The interac-tion between test machine and ball duri
7、ng compression.3. Summary of Test Method3.1 The baseball or softball is placed between two flat-platesurfaces of a compression machine and then compressed to astandard displacement of 6.35-mm (0.25-in.). The compressionload (force) applied at the standard displacement is recorded.4. Significance and
8、 Use4.1 The static compression-displacement of a baseball orsoftball is a mechanical property which can correlate todynamic properties.4.2 This test method is suitable for obtaining data inresearch and development, quality control, and classifyingballs by the compression-displacement.4.3 Sports asso
9、ciations can use compression-displacementstandards in specifications for official baseballs and softballsstandards in specifications for official baseballs and softballsfor purposes of consistency of performance.4.4 This same test procedure can be utilized with othercompressive forces and the specif
10、ied force is not necessarilythe same as experienced in actual use.5. Apparatus5.1 Compression Device, to compress the test ball betweentwo flat plates to 6.35 mm (0.25 in.) displacement. Compres-sive force to 3560 N (800 lb) is sufficient. A means of centeringthe test ball so that the vertical axis
11、of the ball aligns with thevertical axis of the compression device piston.5.2 Compression Force Gage, to measure the compressiveload in newtons or pounds. Device must be able to measure atleast 4448 N (1000 lb).5.3 Compression-Displacement Gage, to measure the dis-placement at the prescribed level o
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