IS 1608 (2005): Mechanical testing of metals - …

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2 > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 1608 (2005): Mechanical testing of metals - TensileTesting [MTD 3: Mechanical testing of metals ]IS 1608 : 2005 ISO 6892 : 1998 IndianStandardMETALLIC MATERIALS -TENSILETESTINGATAMBIENTTEMPERATURE(Thir dRevision)Second Reprint JULY >BIS2005 BUREAUOFINDIANSTANDARDSMANAK SHAVAN, 9 SAHADUR SHAH ZAFAR MARGNEWDELHI110002 May2005 Price Group 13 MechanicalTestingofMetalsSectionalCommit tee,MTD3 NATIONALFOREWORDThisIndianStandard( ThirdRevision)whichisidenticalwithISO689 2: 1998-Metallicmaterials-Tensiletestingata mbienttemperature'issuedby theInternationalOrganizationforStandardi zation( ISO )wasadoptedby theBureauofIndianStandardson therecommendationsof theMechanicalTestingofMetalsSectionalCom mitteeandapprovalof 1960 andsubsequentlyrevisedin toalignit withISO6892: ,however, particularlydrawnto thefollowing:a)Whereverthewords'Internat ionalStandard'appear,referringto thisstandard,theyshouldbeasreadas'Indian Standard'.

3 B)Comma( , ) hasbeenusedas adecimalmarkerwhileinIndianStandards,the currentpracticeis to use apoint( . ) thisadoptedstandard, to besubstitutedintheirplacesarelistedbelow alongwiththeirdegreeofequivalenceforthee ditionsindicated:InternationalStandardCo rrespondingIndianStandardDegreeofEquival enceISO286-2:1988 ISOsystemoflimitsandfits-Part2 :Tablesofstandardtolerancegradesandlimit deviationsforholesandshaftsISO 377 :1997 Steelandsteelproducts-Locationandprepara tionofsamplesandtestpiecesformechanicalt estingISO2566-1:1984 SteelConversionofelongationvalues-Part1 :CarbonandlowalloysteelsISO2566-2:1984 Steel-Conversionofelongationvalues-Part 2 :AusteniticsteelsISO7500-1:19861) :Tensiletestingmachines1)Sincerevisedin 919 ( Part 2 ) : 1993 ISOsystemsoflimitsandfits.

4 Part2 Tablesofstandardtolerancegradesandlimitd eviationsforholesandshafts(firstrevision )IS 3711 :1990 Wroughtsteel -Selectionandpreparationofsamplesandtest piecesformechanicaltest(firstrevision)IS 3803(Part1 ) :1989 Steel-Conversionofelongationvalues:Part1 Carbonand lowalloyssteels(secondrevision)IS3803(Pa rt2 ) :1989 Steel-Conversionofelongationvalues:Part2 Austeniticsteels(secondrevision)IS1828( Part 1 ) : 1991 Metallicmaterials~Verificationofstaticun iaxialtestingmachines:Part1 Tensiletestingmachines(secondrevision)Id enticalTechnicaltyequivalentIdenticaldod o(Continuedon thirdcover) IS1608:2005 ISO6892:1998 IndianStandardMETALLICMATERIALS -TENSILETESTINGATAMBIENTTEMPERATURE( ThirdRevision)1 ScopeThisInternationalStandardspecifiest hemethodfortensiletestingofmetallicmater ialsanddefinesthemechanicalpropertieswhi chcan ,throughreferencein this text, thetimeofpublication, ,andpartiestoagreementsbasedonthisIntern ationalStandardareencouragedtoinvestigat ethepossibilityofapplyingthemostrecented itionsof :1988,ISOsystemoflimitsandfits-Part2 :1997, :1984,Steel-Conversionofelongationvalues -Part1 :1984,Steel-Conversionofelongationvalues -Part2 :1986,Metallicmaterials-Verificationofst aticuniaxialtestingmachines-Part1.

5 -1), testpiecebytensileforce,generallytofract ure,for thepurposeofdeterminingoneormoreof carriedoutatambienttemperaturebetween10 Cand35 C, atemperatureof 23 C 5 )Tobepublished.(RevisionofISO9513:1989)1 1-2708fS12OO8 IS1608:2005 ISO6892:19984 DefinitionsForthepurposeof thisInternationalStandard, ( ):Lengthof thecylindricalorprismaticportionof ,adistinctionis (Lo) (l~lJ):Gaugelengthafterruptureofthetestp iece( ). (Lc) :Parallelportionof thereducedsectionof parallel length is replaced by theconceptofdistancebetweengrips fornon-machinedtest :Increasein theoriginalgaugelength(Lo)atanymomentdur ingthe :Elongationexpressedas apercentageof theoriginalgaugelength(Lo) . :Increasein theoriginalgaugelengthofatestpieceafterr emovalofaspecifiedstress(see ),expressedas apercentageof theoriginalgaugelength(La).

6 (A):Permanentelongationof thegaugelengthafterfracture( )'expressedas apercentageof theoriginalgaugelength(1."0)'In thecaseofproportionaltestpieces,onlyif theoriginalgaugelengthis otherthan 5,65A2)whereSois theoriginalcross-sectionalareaof theparallellength,thesymbolAshall besupplementedby anindexindicatingthecoefficientofproport ionalityused,forexample:A11,3=percentage elongationof agaugelength(IJo)of11,3[5;.In thecase ofnon-proportionaltestpieces,thesymbolAs hall besupplementedby anindexindicatingtheoriginalgaugelengthu sed,expressedinmillimetres,forexample:,1 80mm=percentageelongationof agaugelength(Lo) (At):Totalelongation{elasticelongationpl usplasticelongation)of thegaugelengthat themomentoffractureexpressedas apercentageoftheoriginalgaugelength(1-"0 )'ti:(4s;:2)5,65vSo=5v-f2 IS1608:2005 ISO6892 :Increaseinthegaugelengthofthetest piece atmaximumforce,expressedas apercentageof theoriginalgaugelength(La).]}

7 Adistinctionis madebetweenthepercentagetotalelongationa tmaximumforce(Agt)and thepercentagenon-proportionalelongationa tmaximumforce(Ag)(seefigure1). (Le):Lengthof theparallelportionof the testpieceused for themeasurementofextensionbymeansof yield andproofstrengthparameterLe~ isfurtherrecommendedthatformeasurementof parameters"at"or"after" :Increasein theextensometergaugelength(La)ata givenmomentof the :Increasein theextensometergaugelength,afterremovalo fa specifiedstressfrom thetestpiece,expressedas apercentageof theextensometergaugelength(Le) (Ae) :Indiscontinuousyieldingmaterials,theext ensionbetweenthestartofyieldingand expressedas apercentageoftheextensometergaugelength( La). (Z):Maximumchangeincross-sectionalarea(S o-Su)'which hasoccurredQuringthetestexpressedas apercentageof theorignalcross-sectionalarea(So), (Fm):Thegreatestforcewhichthetestpiecewi thstandsduringthe test once ,withoutyieldpoint,it is themaximumvalueduringthe :Atanymomentduringthe test,forcedividedby theoriginalcross-sectionalarea(So)of (Rm) :Stresscorrespondingto themaximumforce(Fm).

8 :Whenthemetallicmaterialexhibitsa yieldphenomenon,apointisreachedduringthe testatwhichplasticdeformationoccurswitho utanyincreasein the force. Adistinctionis (ReH) :Valueofstressat themomentwhenthefirstdecreasein forceisobserved(seefigure2).3 IS1608:2005 ISO6892 (ReL) :Lowestvalueofstressduringplasticyieldin g,ignoringanyinitialtransienteffects( ). ,non-proportionalextension(/\fJ):Stressa twhichanon-proportionalextensionisequalt o aspecifiedpercentageof theextensomctergaugelength(/.f)(seefigur e3). Thesymbolusedis followedby asuffixgivingtheprescribedpercentage,for example:I~po.~~. ,totalextension(Rt) :Stressatwhichtotalextension(elasticexte nsionplusplasticextension)is equalto aspecifiedpercentageof thecxtensornetergaugelength(/.)

9 C)(seefigure4).Thesymbolusedis followedby asuffixgivingtheprescribedpercentagefore xample:/\ (/~r):Stressatwhich,afterrernovalofforce ,a specifiedpermanentelongationorextensione xpressedrespectivelyas apercentageof theoriginalgaugelength(/"0)orextensomete rgaugelength(l"e)hasnotbeenexceeded(seef igure5).Thesymbolusedis followedbyasuffixgivingthespecifiedperce ntageof theoriginalgaugelength(/"0)or of theextensometergaugelength(te) ,forexample:J~ ' thetestpiecesdependon theshapeanddimensionsof usuallyobtainedbymachininga samplefromtheproductor (sections,bars,wires,etc.)andalsoas-cast testpieces( ) thetestpiecesmaybecircular,square,rectan gular,annularor, inspecialcases, ,theoriginalgaugelengthofwhichis relatedto theoriginalcross-sectionalareaby theequationlJo=k~ , thetestpieceistoosmallforthisrequirement to bemetwiththecoefficientkvalueof5,65,a highervalue( )ora ,theoriginalgaugetength( )is takenindependentlyof theoriginalcross-sectionalarea(So).

10 Thedimensionaltolerancesof thetestpiecesshallbe inaccordancewiththeappropriateannexes( ).4 Table 1 -SymbolsanddesignationsIS1608:2005 ISO6892:1998 Referencenumber1)SymbolUnitDesignationTe stpiece1a2)mmThicknessof a flat testpieceor wallthicknessof a tube2bmmWidthof theparallellengthof a flat test piece oraveragewidth of alongitudinalstripfrom a tube orwidth of flat wire3dmmDiameterof theparallellength of acirculartestpiece,ordiameterofroundwire orinternaldiameterof a tube4 DmmExternaldiameterof a 'mmInitialgaugelengthfordeterminationofA g06i; ;mmFinalgaugelengthafterfracturefordeter minationof149(seeannexH)9 Somm2 Originalcross-sectionalareaof theparallellength10 Summ2 Minimumcross-sectionalareaafterfracture- k-Coefficientofproportionality11Z0/0 Percentagereductionofarea:So-Sux100So12- -Grippedends2-210 BISflOOI5 IS1608;2005 ISO6892:1998 Table1(concluded)Referencenumber')Symbol UnitDesignationElongation13-mmElongation after fracture:L.