ASTM_F_521_-_83_2010.pdf

Designation:F52183(Reapproved 2010)Standard Test Methods forBond Integrity of Transparent Laminates1This standard is issued under the fixed designation F521;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover determination of the bondintegrity of transparent laminates.The laminates are usuallymade of two or more glass or hard plastic sheets held togetherby an elastomeric material.These test methods are intended toprovide a means of determining the strength of the bondbetween the glass or plastic and the elastomeric interlayerunder various mechanical or thermal loading conditions.1.2 The test methods appear as follows:Test MethodsSectionsTest Method AFlatwise Bond Tensile Strength5 11Test Method BInterlaminar Shear Strength12 17Test Method CCreep Rupture18 25Test Method DThermal Exposure26 301.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D952 Test Method for Bond or Cohesive Strength of SheetPlastics and Electrical Insulating Materials2.2 ANSI Standard:3B1.1 Standard for Unified Screw Threads3.Terminology3.1 Definitions:3.1.1 delaminationa visible separation between two layersof bonded material.3.1.2 face pliestransparent glass or plastic outer materialsjoined together with an interlayer.3.1.3 interlayertransparent material used as the bondingagent between two or more hard,transparent materials.3.2 Definitions of Terms Specific to This Standard:3.2.1 number of pliesa three-ply laminate is one havingtwo transparent glass or plastic plies and one interlayer ply.Afive-ply laminate has three glass or plastic plies and twointerlayer plies.4.Significance and Use4.1 These test methods provide a means to measure quan-titatively the bond integrity between the outer layers of thetransparency and the interlayer,or to measure the cohesiveproperties of the interlayer,under various loading conditions.4.2 These test methods provide empirical results useful forcontrol purposes,correlation with service results,and asquality control tests for acceptance of production parts.4.3 Test results obtained on small,laboratory-size samplesshown herein should be considered indicative of full-size partcapability,but not necessarily usable for design purposes.TEST METHOD AFLATWISE BOND TENSILESTRENGTH5.Summary of Test Method5.1 The bond is subjected to a mechanical load in a directionperpendicular to the plane of the bond.The adhesive orcohesive strength between the interlayer and the outer layers(flatwise tensile strength)is determined,and expressed in termsof pascals(or pounds-force per square inch).6.Apparatus6.1 Metal BlocksA pair of 50-mm(2-in.)square metalblocks of 24 ST aluminum alloy,each having a maximumheight of 50 mm(2 in.).Each block shall have in one end ahole(see Fig.1)tapped 22.2 mm(78in.)in accordance withANSI B1.1,to accommodate threaded 22.2-mm(78-in.)studsof convenient length(see Test Method D952).Alternativemetal blocks may be made using an aluminum“T”section,cutto 50 mm(2 in.)square.A hole shall be drilled in the uprightsection of each“T”block(see Fig.2)to accommodate a metalpin or holding device compatible with the test machine used.6.2 Testing MachineAny suitable machine of the constant-rate-of-crosshead movement type.The testing machine shall be1These test methods are under the jurisdiction of ASTM Committee F07 onAerospace andAircraft and are the direct responsibility of Subcommittee F07.08 onTransparent Enclosures and Materials.Current edition approved May 1,2010.Published June 2010.Originallyapproved in 1977.Last previous edition approved in 2004 as F521 83(2004).DOI:10.1520/F0521-83R10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 FIG.1 Test Assembly for Flatwise Tensile Strength TestF521 83(2010)2 equipped with the necessary drive mechanism for imparting tothe crosshead a uniform,controlled velocity with respect to thebase.The testing machine shall also be equipped with aload-indicating mechanism capable of showing the total loadapplied to the test specimen.This mechanism shall be essen-tially free from inertial-lag at the specified rate of testing andshall