Designation:B820−14aStandardTestMethodforBendTestforDeterminingtheFormabilityofCopperandCopperAlloyStrip1ThisstandardisissuedunderthefixeddesignationB820;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethoddescribesthetechniqueofbendtestingcopperandcopperalloystripsamplestodetermineproductformabilityortheabilitytoresistcrackingwhenformingabendaroundaspecificradius.Thecriterionforfailureistheoccurrenceofcracksontheouterradiusofcurvature(convex).1.2Thisbendtestislimitedtostripfrom0.003toandincluding0.031in.thick(0.076toandincluding0.79mm).1.3Thesizeoftheformingradiiusedinthistestshallbe0.005toandincluding0.250in.(0.127toandincluding6.35mm).1.4Units—Valuesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitswhichareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B846TerminologyforCopperandCopperAlloysB950GuideforEditorialProceduresandFormofProductSpecificationsforCopperandCopperAlloysE6TerminologyRelatingtoMethodsofMechanicalTestingE290TestMethodsforBendTestingofMaterialforDuctil-ity3.Terminology3.1Fordefinitionsoftermsrelatedtocopperandcopperalloys,refertoTerminologyB846.3.2Fordefinitionsoftermsrelatedtomechanicaltesting,refertoTerminologyE6.3.3DescriptionofTermsSpecifictoThisStandard:3.3.1bend,longitudinal(orgoodwaybend)—abendwithanaxisperpendiculartothedirectionofrolling,drawingorextrusion(seeFig.1).3.3.2bend,transverse(orbadwaybend)—abendwithanaxisonaplaneparalleltothedirectionofrolling,drawing...
