Designation:D1780−05(Reapproved2012)StandardPracticeforConductingCreepTestsofMetal-to-MetalAdhesives1ThisstandardisissuedunderthefixeddesignationD1780;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thispracticecoversthedeterminationoftheamountofcreepofmetal-to-metaladhesivebondsduetothecombinedeffectsoftemperature,tensileshearstress,andtime.NOTE1—Sincethecharacteristicsthatrenderamaterialresistanttocreepundertheconditionoftestarenotyetcompletelyknown,thedetailsoftheprocedureconsideredhereinarethoseknowntohaveimportantinfluences.Sinceotherequallyimportantcharacteristicsmaybediscov-eredinthefuture,therecommendeddetailsarelargelyadvisoryinnature.1.2Testperiodsdependuponthereasonablelifeexpectedfromthematerialinservice.Theuncertaintiesofextrapolationshouldbeconsideredindecidinguponthelengthofthetest.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D907TerminologyofAdhesivesD1002TestMethodforApparentShearStrengthofSingle-Lap-JointAdhesivelyBondedMetalSpecimensbyTen-sionLoading(Metal-to-Metal)3.Terminology3.1Definitions—ManyofthetermsinthispracticearedefinedinTerminologyD907.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1creep,n—thetime-dependentpartofthestrainthatresultsfromexposuretoaconstanttemperatureandload(Note2).Thatis,thecreepatagivenelapsedtimeisequaltothetotalstrainatthegiventimeminustheinstantaneousstrain(Note3)onloading.Thecreepextens...
