1、Designation:D 4268 93Standard Test Methods forTesting Fiber Ropes1This standard is issued under the fixed designation D 4268;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
2、the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods specify procedures to determinediameter and circumference(Section 8),linear density(Section14),breaking force(Section 21),and elongation(Sections 28and
3、 36)of fiber ropes except those ropes incorporating steelwire.(See.)1.2 The values stated in SI units are to be regarded asstandard.The values provided in parentheses are provided forinformation purposes only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated w
4、ith 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.Additional precau-tions for these test methods are given in Section 5.2.Referenced Documents2.1 ASTM Standard
5、s:D 76 Specification for Tensile Testing Machines for Tex-tiles2D 123 Terminology Relating to Textiles2E 4 Practices for Force Verification of Test Machines3E 74 Practice for Calibration of Force Measuring Instru-ments for Verifying the Load Indication of Testing Ma-chines32.2Military Standard4:MIL-
6、STD-1913.Terminology3.1 Definitions:3.1.1 braided rope,na cylindrically produced rope madeby intertwining,maypole fashion,several to many strandsaccording to a definite pattern with adjacent strands normallycontaining yarns of the opposite twist.3.1.2 cycle length,nin braided rope,the distance,paral
7、lelto the rope axis,of the strand to make one revolution aroundthe rope.3.1.2.1 Discussionpick count is reported in picks permetre,picks per foot,picks per inch,etc.3.1.3 pick count,nin braided rope,the number of strandsrotating in one direction in one cycle length.3.1.4 elongation,nthe ratio of the
8、 change in length of arope during application of tension to the original length of therope when new.3.1.4.1 non-elastic elongation(NE),nof rope,elongationafter cyclic tensioning the rope to a specified force for aspecified number of cycles.3.1.4.2 recoverable elongation(CE),nof rope,elongationwhich
9、may be reclaimed following a period of rope relaxationafter the rope was cyclic tensioned.3.1.4.3 residual elongation(RE),nof rope,elongationafter cyclic tensioning the rope to a specified force for aspecified number of cycles and allowing the rope to relax for aspecified period of time.3.1.4.4 work
10、ing elongation(WE),nof rope,elongationwhich is immediately recoverable when tension is removedfrom the rope.3.1.4.5 total elongation(TE),nof rope,the entire elonga-tion at any given applied force.3.1.5 extension,nthe ratio of the change in length of arope during application of tension to the length
11、of the ropeimmediately before application of that load.3.1.6 fiber rope,na rope produced primarily from textilefibers.3.1.7 fid,na wooden or hard plastic tapered tool used asan aid in rope splicing.3.1.8 hockle,nin rope,a strand kink in a rope causingyarn displacement in the strand resulting in rope
12、 deformationand damage.3.1.9 kink,nin rope,an abrupt bend or loop in the ropewhich is the result of an unbalanced twist relationship in therope structure.3.1.10 plaited rope,nrope made from eight strands ar-ranged in four pairs in which one strand is placed adjacent tothe second in each pair and in
13、which each strand in each pairhas been twisted in one direction while each strand in eachalternate pair has been twisted in the opposite direction and thefour pairs of strands are intertwined maypole fashion in amanner such that each pair of strands passes over and underadjacent pair of strands(syn.
14、eight strand rope)3.1.11 tuck,nin rope,a free strand of the rope placedbetween rope strands during rope splicing.1These test methods are under the jurisdiction of ASTM Committee D-13 onTextiles and are the direct responsibility of Subcommittee D13.16 on Ropes andCordage.Current edition approved July
15、 15,1993.Published September 1993.Originallypublished as D 4268 83.Last previous edition D 4268 93.2Annual Book of ASTM Standards,Vol 07.01.3Annual Book of ASTM Standards,Vol 03.01.4Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:N
16、PODS.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.3.1.12 reference tension,na low tensile force,generallyabout 1%of the rope breaking strength,calculated in accor-dance with 11.2,and used for initial rope tension determina-tions.3.1.13 rope,na compact and flexible,generally torsion-ally balanced con
