Designation:D3171−22StandardTestMethodsforConstituentContentofCompositeMaterials1ThisstandardisissuedunderthefixeddesignationD3171;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodsdeterminetheconstituentcontentofcompositematerialsbyoneoftwoapproaches.TestMethodIphysicallyremovesthematrixbydigestionorignitionorcarbonizationbyoneofeightprocedures,leavingtherein-forcementessentiallyunaffectedandthusallowingcalculationofreinforcementormatrixcontent(byweightorvolume)aswellaspercentvoidvolume.TestMethodII,applicableonlytolaminatematerialsofknownfiberarealweight,calculatesreinforcementormatrixcontent(byweightorvolume),andthecuredplythickness,basedonthemeasuredthicknessofthelaminate.TestMethodIIisnotapplicabletothemeasurementofvoidvolume.1.1.1Thesetestmethodsareprimarilyintendedfortwo-partcompositematerialsystems.However,specialprovisionscanbemadetoextendthesetestmethodstofilledmaterialsystemswithmorethantwoconstituents,thoughnotalltestresultscanbedeterminedineverycase.1.1.2Theprocedurescontainedwithinhavebeendesignedtobeparticularlyeffectiveforcertainclassesofpolymerormetalmatrices.ThesuggestedapplicationsarediscussedinSection4,aswellasatthestartofeachprocedure.1.1.3TestMethodIassumesthatthereinforcementisessentiallyunaffectedbythedigestionorignitionmediumorcarbonization.Aprocedureforcorrectionoftheresultsforminorchangesinthereinforcementisincluded.ProceduresAthroughFarebasedonchemicalremovalofthematrix,whileProcedureGremovesthematrixbyignitingthematrixinafurnace.ProcedureHcarbonizesthematrixinafurnace.1.1.4TestMethodIIassumesthatthefiberarealweightofthereinforcementmaterialformisknownorcontrolledtoanacceptabletolerance.Thepresenceofvoidsisnotmeasured.Eq15and16assumeze...
