1、Designation:F281910(Reapproved 2015)Standard Test Methods forMeasurement of Straightness of Bar,Rod,Tubing and Wireto be used for Medical Devices1This standard is issued under the fixed designation F2819;the number immediately following the designation indicates the year oforiginal adoption or,in th
2、e 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 standard covers the various test methods to be usedfor measurement of straightness of b
3、ar,rod,tubing,and wire.These test methods apply primarily to bar,rod,tubing,and wirethat are ordered in the straightened and cut-to-length condition.It also applies to small diameter tubing and wire that has beenspecially processed to roll off a spool in the straightenedcondition.1.2 These test meth
4、ods apply to straightness of round wirethat has a diameter between 0.05 and 4.78 mm(0.002 and0.188 in.).They also apply to flatness(camber)of flat-shapedwire or ribbon with a maximum dimension between 0.05 and4.78 mm(0.002 and 0.188 in.).For flatness(camber)measurement,refer to Test Method F2754/F27
5、54M.NOTE1The current version of Test Method F2754/F2754M covers adifferent diameter range(0.0127 to 4.78 mm(0.0005 to 0.188 in.)anddoes not include superelastic NiTi.These exceptions would not affect thecamber measurement as conducted by Test Method F2754/F2754M.1.3 These test methods apply to strai
6、ghtness of round tubingthat has an outer diameter between 0.05 and 6.35 mm(0.002and 0.25 in.).1.4 These test methods apply to straightness of round rodthat has a diameter between 4.78 and 6.35 mm(0.188 and 0.25in).It also applies to flatness(camber)of flat and shaped rodwith a maximum dimension betw
7、een 4.78 and 6.35 mm(0.188and 0.25 in).For measurement of flatness(camber),refer toTest Method F2754/F2754M.NOTE2The current version of Test Method F2754/F2754M covers adifferent diameter range(0.0127 to 4.78 mm(0.0005 to 0.188 in.)anddoes not include superelastic NiTi.These exceptions would not aff
8、ect thecamber measurement as conducted by Test Method F2754/F2754M.1.5 These test methods apply to straightness of round barthat has a diameter between 6.35 and 101.6 mm(0.25 and 4 in).It also applies to flatness(camber)of flat and shaped bar witha maximum dimension between 6.35 and 101.6 mm(0.25 an
9、d4 in).For measurement of flatness(camber),refer to TestMethod F2754/F2754M.NOTE3The current version of Test Method F2754/F2754M covers adifferent diameter range(0.0127 to 4.78 mm(0.0005 to 0.188 in.)anddoes not include superelastic NiTi.These exceptions would not affect thecamber measurement as con
10、ducted by Test Method F2754/F2754M.1.6 These test methods apply to ferrous and non-ferrousalloys including linear-elastic or superelastic nitinol.Refer toTerminology F2005 for more details on NiTi terminology.1.7 The values stated in either SI units or inch-pound unitsare to be regarded separately a
11、s standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.8 This standard does not purport to address all of thesafety concerns,if any,ass
12、ociated 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 ASTM Standards:2F2005 Terminology for Nickel-Titanium Shape MemoryAlloysF2
13、754/F2754M Test Method for Measurement of Camber,Cast,Helix and Direction of Helix of Coiled Wire2.2 Other Standards:3GGG-P-463 U.S.Federal Specification:Plate,Surface(Granite)3.Terminology3.1 Fig.1 and Fig.2 show the physical meaning ofstraightness.Fig.3 shows the definition of wobble in a straight
14、wire as it is being rotated.1These test methods are under the jurisdiction of ASTM Committee F04 onMedical and Surgical Materials and Devices and is the direct responsibility ofSubcommittee F04.15 on Material Test Methods.Current edition approved May 1,2015.Published July 2015.Originally approvedin
15、2010.Last previous edition approved in 2010 as F2819 10.DOI:10.1520/F281910R15.2For referenced ASTM standards,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
16、ASTM website.3Available from IHS,321 Inverness Drive South Englewood,CO 80112,http:/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 Definitions of Terms Specific to This Standard:3.2.1 straightnessDeviation of an axis or surface elementfrom linearity over a unit length in the unloaded(force andmoment free)condition.Aperfectly straight condition is shownin Fig.1.An unloaded condition is shown in Fig.2.3.2.2 wobbleElliptical rotati
