ASTM_F_2117_-_10.pdf

Designation:F211710An American National StandardStandard Test Method forVertical Rebound Characteristics of Sports Surface/BallSystems;Acoustical Measurement1This standard is issued under the fixed designation F2117;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the quantitative measurementand normalization of the vertical rebound produced duringimpacts between athletic balls and athletic surfaces.1.2 Measurements may be conducted on nonathletic sur-faces to test the performance properties of the ball.1.3 Measurements may be conducted using nonathletic ballsto test the performance properties of the surface.1.4 The methods described are applicable in both laboratoryand field settings.1.5 The values stated in metric units are to be regarded asthe standard.The inch-pound units given in parentheses are forreference only.1.6 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 regulatory limitations prior to use.2.Referenced Documents2.1 DIN(Deutsches Institut fur Normung):218032 Part II,1991 Section 5.82.2 British Standards:37044,1990,Section 2.12.3 EN(European Committee for Standardization):4EN 12235 Surfaces for sports areas-Determination ofvertical ball behaviour3.Terminology3.1 Definitions:3.1.1 area elastic surface,nsurfaces where the energy atimpact is dispersed throughout an area significantly larger thanthe impact point(for example,sprung wooden basketballfloors,poured urethane floors over sprung subfloor).Areaelastic surfaces tend to produce a noticeable vibration whenimpacted.3.1.1.1 subfloor,nany structural members found betweenthe playing surface and the underlying concrete base.Subfloorsystems are typically found in sprung indoor playing surfacesand can include but are not limited to:layers consisting ofsheets of plywood,layers consisting of strips of plywood,andsolid-wood members.3.1.2 athletic surface,nan athletic surface appropriate forthe sport(s)of interest should be selected for testing.Thesurface may be selected from previously installed surfaces andtested in its complete form,or smaller samples may be testedunder laboratory settings.3.1.3 coeffcient of restitution(CR),nthe ratio of reboundheight to release height.This parameter is useful for nonin-flated balls that are found to be damaged by impacts with aconcrete reference surface.Construction differences and sen-sitivity to inflation pressure make this parameter inappropriatefor comparing different playing surfaces based on resultsobtained using inflated sporting balls.3.1.4 point elastic surface,nsurface where the energy atimpact is dispersed throughout an area that negligibly exceedsthe impact point(for example,natural turf,artificial turf,poured urethane surfaces).Point elastic surfaces do not pro-duce noticeable vibrations when impacted.3.1.5 reference surface,nany section of a concrete slabwith a smooth uniform,uncracked surface with a minimumhorizontal dimension of 30 cm(12 in.)that produces a reboundwith minimal horizontal movement.3.1.6 resting time constant(Kr),na time constant thatcorrects for the duration that the ball is in contact with thesurface.3.1.7 sporting ball,na sporting ball appropriate for thesport(s)of interest should be selected for testing.The test ballshould be inspected to verify that it is spherical and devoid ofbulges.Bulges indicate structural damage exists within the1This test method is under the jurisdiction of ASTM Committee F08 on SportsEquipment,Playing Surfaces,and Facilitiesand is the direct responsibility ofSubcommittee F08.52 on Miscellaneous Playing Surfaces.Current edition approved June 1,2010.Published August 2010.Originallyapproved in 2001.Last previous edition approved in 2001 as F2117 01 which waswithdrawn in February 2010 and reinstated in June 2010.DOI:10.1520/F2117-10.2Available from DIN,Burggrafenstrasse 6,D-10787 Berlin,Germany.3Available from BSI,389 Chiswick High Road,London W4 4AL,UK.4Available from ANSI,1819 L Street,Washington,DC 20036,USA.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 ball,that could affect the testing results.In the case of inflatedsporting balls,the pressure should conform to manufacturersguidelines.3.1.8 vertical rebound height,nthe highest heightachieved by sporting ball during its first rebound after contact-ing the surface,as measured from the bottom of the ball to thetop of the surface.3.1.9 vertical rebound ratio(VRR),nthe ratio of therebound on the test surface to the rebound on the referencesurface,expressed as a percentage.This param