ASTM_F_2117_-_10_2017.pdf

Designation:F211710(Reapproved 2017)An 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.1.7 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 World Trade Organization TechnicalBarriers to Trade(TBT)Committee.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 ball1This test method is under the jurisdiction of ASTM Committee F08 on SportsEquipment,Playing Surfaces,and Facilities and is the direct responsibility ofSubcommittee F08.52 on Miscellaneous Playing Surfaces.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 2001.Last previous edition approved in 2010 as F2117 10.DOI:10.1520/F2117-10R17.2Available 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization 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.1 should be inspec