1、Designation:F42910An American National StandardStandard Test Method forShock-Attenuation Characteristics of Protective Headgearfor Football1This standard is issued under the fixed designation F429;the number immediately following the designation indicates the year of originaladoption or,in the case
2、of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the shock-attenuation characteristics of protective head
3、gear for football.21.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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
4、 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3F717 Specification for Football Helmets2.2 SAE Document:J221 JUN 80 Instrumentation for Impact Tests,Require-ments for Channel Class 1
5、00042.3 ISO Standard:ISO/DIS 6220 Headforms For Use in the Testing of Protec-tive Helmets53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 basic planean anatomical plane that includes thesuperior rims of the auditory meatuses(the upper edges of theexternal openings of the ears)a
6、nd the notches of the inferiororbital ridges(the bottom of the eye sockets).See Fig.1.3.1.2 coronal planea vertical plane that is perpendicularto the median and reference planes and passes through thecrown of the headform(lateral plane).3.1.3 crowna point in the median plane which is equalchord leng
7、ths from the anterior and posterior intersections ofthe median and reference planes.3.1.4 drop heightthe vertical distance between the lowestpoint(impact point)of the elevated helmet and the apex of theimpact surface.3.1.5 gdimensionless ratio of the acceleration of theheadform during impact to the
8、acceleration due to gravity.3.1.6 gmaxthe maximum value of g encountered duringimpact.3.1.7 median planea vertical plane that passes through theheadform from front to back and divides it into right and lefthalves(mid-sagittal plane).3.1.8 protective headgearthe assembled device and acces-sories as s
9、upplied by the manufacturer primarily intended toprotect the wearers head while participating in football.3.1.9 reference planea plane that is located at a specifieddistance above and parallel to the basic plane.4.Summary of Test Method4.1 A headgear is mounted on a headform that is oriented indiffe
10、rent positions and is dropped at a specific velocity onto animpact surface.Alinear accelerometer mounted at the center ofgravity of the headform monitors the acceleration and the timehistory of impact which are recorded with appropriate instru-mentation.5.Significance and Use5.1 Maximum acceleration
11、 and time duration data obtainedby the specified procedures are intended to determine the shockattenuation characteristics of a headgear.1This test method is under the jurisdiction of ASTM Committee F08 on SportsEquipment,Playing Surfaces,and Facilities and is the direct responsibility ofSubcommitte
12、e F08.53 on Headgear and Helmets.Current edition approved Aug.1,2010.Published September 2010.Originallyapproved in 1975.Last previous edition approved in 2007 as F429 01(2007).DOI:10.1520/F0429-10.2Performance requirements for football helmets are found in Specification F717.3For referenced ASTM st
13、andards,visit 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.4Available from the Society of Automotive Engineers,400 Commonwealth Dr.,Warrendale,PA 15
14、096.5Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1These data can be used at a later date to assess the protectionafforded to the head w
15、hen blows are delivered to the helmet.6.Apparatus56.1 Guide Assembly6The headform shall be attached tothe free-fall drop assembly carriage by an adjustable mountingwhich will allow impacts to be delivered to any prescribedpoint on the helmet(see Fig.2).The carriage shall be free toslide on vertical
16、guides.If wires are used they must be placedunder at least 845-N tension(see 12.4 for guide assemblyspecifications and allowable weight of drop assembly).6.2 Recording Equipment6The recording equipment shallmeet the following criteria:6.2.1 Acceleration TransducerThe acceleration trans-ducer is mounted at the center of gravity of the combined testheadform and carriage assembly with the sensitive axis alignedto within 5 of the vertical when the helmet and headform arein the impact position.The ac
