an insight into wire rope geometry

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1、MZ*?Nl3PIs3a1*00PngamonPm5plcANINSIGHTINTOWIREROPEGEOMETRYtW.K.LEEStructuralTestandAnalysisDtvision.TheNationalEngineeringL&oratory.East&bride.GlasgowG7SOQU.UK.Ahtract--Cartcsiclnca~~rdinsteequations.whichdescribethehelixgeometryofwireswithin3rope.areprescntcxi.Thrcrughtheap

2、$catxmofdttferentialgeomelrvandtheU.Woftheengineeringdraiinydcvcl~~~rnentapproach.problemsassociatedwiththethree-dirnensi~n~~helixgeometryofwireropecanIWsolved.;~llowinganalysisofthegeometricaIproperties.Thegeometricalanalysisprcsentcdinthispaperappliestoanyropewithanisymme

3、tricstrands.tCrowncopyrightIIWI.172b..K.LEEI.lSTRODl_CTlONAwireropeisacomplexgeometricalstructuremadeupofmanyindividualwires.Theconstructionofwireropecgivesitflexibilityandassuchitisanidealstructureforthetransferoftensileload.Undernormaloperatingconditionswireswithinaropeare

4、subjecttovaryingdegreesofmechanicaldamage.Thisdamageiscloselyassociatedwiththegeometricalpropertiesoftheindividualwireswithwhicharopeisconstructed.Thedegreeofdamagedependsuponthegeometricalandspatialconfigurationofthewiresashellastheirpositionswithintherope.Athoroughundersta

5、ndingofthegeometricalpropertiesisrequiredinordertomodelthedeformationandstraincomponentsalongindividualwireswithinaropeunderoperatingconditions.Theconstructionoftwotypesofstrandedwirerope.namelysix-strandandmulti-strand,isdescribedinthissectiontoacquaintthereaderwithwirerope

6、andconstructionterminology.Thegeometricalanalysispresentedinthispaper.however.isnotrestrictedtothesetypesbutappliestoanyropebvithaxisymmetricstrands.I.I.I.Si.y-strtrrrtlrap.Wireswhicharcivoundaroundacentralstraightkingivircproduce;Istraightstrand[Fig.I(a)(i)].Theouterwiresin

7、thisstrandareallsin&heliccs.Ifnow.forexample.sixofthesestrandsarethenwoundaround:1centralstraightstrandtheseouterstrandswillalsohave;Isinglehelicalform.Similarly.thecentralcorewireineachofthcscstrandshas;Isinglehelicalform;however.theremainingwiresintheseouterstrandseachtake

8、ontheformof;Idouhlchelix.Suchastructureistcrmcd;Isix-strand(blFig.I.Ropecon