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1、MaterialsandStructures/Mat6riauxetConstructions,Vol.36,October2003,pp548452InfluenceofresidualstressesinthetensiletestofcolddrawnwiresJ.M.AtienzaandM.ElicesDepartamentoCienciadeMateriales,UniversidadPolit6cnicadeMadrid,E.T.S.I.Caminos,Madrid,Spain.ABSTRACTRESUMF~Theaimof
2、thispaperistoinvestigatetheinfluenceofL'objectifdecetarticleestlarecherchenum&iqueetresidualstresses,duetocold-drawing,ontheshapeoftheexp&imentaledel'influencedescontraintesr&iduellesduesautensilestress-straincurveandparticularlyitsinfluenceonthetrdfilage?~fi~aidsurlafor
3、mede,lacourbecontrainte-ratioC%.2/~m,~throughanumericalandexperimentalwork.Itd~ormationet,pluspartic~li&ement,soninfluencesurleratiowasfoundthatresidualstressesfavourstheonsetofyieldingr162Cetarticlemontrequelescontraintesr&iduellesandtheratiocyo.2/c~m~,~decreaseswithinc
4、reasingvaluesoffavorslaplastification.Leratio~o,:/cr~,~diminueaufuret27residualstresses.Becauseofthedeleteriouseffectofresidualmesurecluelescontraintesr&iduellesaugmentent.~icausedesstressesonfatigueandstresscorrosionandbecausesucheflbtsndgatifi'des~contraintesr&iduelles
5、surlafatigueetlastressesaffecttheratioc~02,"c~......itisreasonabletoputacorrosiondesmat&iaux,ilestraisonnablededemanderunelowerlimitto~02/O'm~L-~inthestandards.TheratioO'0.2/~maxvaleurlimitepourCro,:/c~,,~.LeratioCro,:/cL,~.peutOtreaugment~canbeincreasedbyrelievingresidu
6、alstresses,acommonhconditiondereldcherlescontraintesrOsiduelles,uneprocedureafterdrawing.Thisfactisalsoascertained.procddurenormaleapr&letr@Tage.1.INTRODUCTIONshapeofthetensilestress-straincurveand,particularly,itsinfluenceontheratioO'0.2/~max.Itishopedthattheseresultsma
7、yshedsomelightonthefiguresrequiredbystandardsandStandardsforcolddrawnwiresforprestressingconcretemayhelpinimprovingthequalityofprestressingwires.[1]requireminimumandmaximumfiguresforcr0.j~ma~,where~0.2andC~m,xarerespectivelytheconventionalyieldstress(ata0.20%offset)andth
8、emaximumstress,as2.EXPERIMENTALWORKmeasuredinatensiletest.Therationalebehindthesefiguresseemstobebasedo
