Designation:D3929−03(Reapproved2015)StandardTestMethodforEvaluatingStressCrackingofPlasticsbyAdhesivesUsingtheBent-BeamMethod1ThisstandardisissuedunderthefixeddesignationD3929;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesaprocedurefordeterminingthecompatibilityofadhesiveswithplasticsbasedonwhethertheadhesivecausescrackingofstressedsamples.1.2Specimenconfigurationsandtestfixturedesignsaregiven.1.3Thistestmethodissuitableforproductsintheformofsheetorstrip.Itcanalsobeusedoninjectionmoldedtensilespecimensorflexuralbars.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D638TestMethodforTensilePropertiesofPlasticsD790TestMethodsforFlexuralPropertiesofUnreinforcedandReinforcedPlasticsandElectricalInsulatingMateri-alsD907TerminologyofAdhesives3.Terminology3.1Definitions—ManyofthetermsinthistestmethodaredefinedinTerminologyD907.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1cracking,n—acontinuouslocalizedfailureoftheplastic,leadingtolossofstructuralintegrity.3.2.2crazing,n—apparentfinecracksatorunderthesurfaceofaplastic.3.2.2.1Discussion—Thisisaformoflocalizedyieldingoftheplasticduetothecombinedactionofstressandanattackingmedium.Initialcrazingmaybedetectableonlybyinspectionundermagnification.3.2.3failure,n—anarbitrarypointdefinedbytheinitialdetectionofcracksorcrazes.4.SummaryofTestMethod4.1Thistestmethodinvolvesthequalitativedeterminationofthecompatibilityofadhesiveswithplasticsbyobser...
