JIS_Z_2254_Method_of_determining_the_plastic_strain_ratio.pdf

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1、MethodofdeterminingtheplasticstrainratioformetallicsheetandstripJISZ2254(1996)IntroductionThisJapaneseIndustrialStandardwasmadeonthebasisofISO10113.Metallicmaterials-Sheetandstrip-Determinationofplasticstrainratio,issuedin1991asthefirsteditionwithoutchangingthetechnicalcontentsexceptthefol

2、lowingpoints:[Outlineofdifferenceofspecifiedcontents]①PartoftensiletestconditionsisbasedonJISZ2241②Specifiedofnumericalvaluesrelatedtogaugelengthandadditionalstrainlevelareadded③Ruleforroundingoffofnumericalvalues④NaturaloscillationmethodnotspecifiedinthecorrespondingInternationalStandardi

3、sspecifiedinAnnex.1.ScopeThisJapaneseIndustrialStandardspecifiesthemethodofdeterminingtheplasticstrainratioforthemetallicsheetandstrip.Remarks1.ThefollowingstandardsarecitedinthisStandard:JISB7721TensiletestingmachinesJISB7741ExtensometersusedinmetallicmaterialtensiletestingJISG0202Glossar

4、yoftermsusedinironsteel(testing)JISZ2201TestpiecesfortensiletestformetallicmaterialsJISZ2241MethodoftensiletestformetallicmaterialsJISZ8401Rulesforroundingoffofnumericalvalues2.ThefollowingisthecorrespondingInternationalStandardtothisStandard:ISO10113:1991Metallicmaterials-Sheetandstrip-De

5、terminationofplasticstrainratio2.DefinitionsForthepurposeofthisStandard,thedefinitionsgiveninJISG0202andthefollowingdefinitionsapply:⑴TestingforceForceappliedtotestpieceforthepurposeoftesting.⑵plasticstrainratioTheratioofthetruewidthstrainandtruethicknessstraininatestpieceofplateshapehasbe

6、ensubmittedtouniaxialtensilestress.ItisalsocalledrvalueorLankfordvaluedefinedbytheequation⑴εwr=…………………………………………………⑴εtwhere,ε:truewidthstrainwε:truethicknessstraintTheequation⑴isonlyvalidintheregionwheretheplasticstrainishomogeneous.Inpractice,theequation⑵derivedfromthelowofconstancyofvolum

7、ebeforeandafterplasticstrainisused.W0lnWr=……………………………………………⑵LWlnLW00where,W:widthoftestpiecebeforetensiledeformation(mm)0W:widthoftestpieceafterstrainingtoaspecifiedelongation(mm)L0:originalgaugelength(mm)L:gaugelengthafterstrainingtoaspecifiedelongation(mm)⑶a