ASTM_D_3433_-_99_2012.pdf

Designation:D343399(Reapproved 2012)Standard Test Method forFracture Strength in Cleavage of Adhesives in Bonded MetalJoints1This standard is issued under the fixed designation D3433;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method(1,2,3,4,5)2covers the determinationof fracture strength in cleavage of adhesives when tested onstandard specimens and under specified conditions of prepara-tion and testing(Note 1).1.2 This test method is useful in that it can be used todevelop design parameters for bonded assemblies.NOTE1While this test method is intended for use in metal-to-metalapplications it may be used for measuring fracture properties of adhesivesusing plastic adherends,provided consideration is given to the thicknessand rigidity of the plastic adherends.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 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:3A167 Specification for Stainless and Heat-ResistingChromium-Nickel Steel Plate,Sheet,and Strip(With-drawn 2014)4A366/A366M Specification for Commercial Steel(CS)Sheet,Carbon,(0.15 Maximum Percent)Cold-Rolled(Withdrawn 2000)4B36/B36M Specification for Brass Plate,Sheet,Strip,AndRolled BarB152/B152M Specification for Copper Sheet,Strip,Plate,and Rolled BarB209 Specification for Aluminum and Aluminum-AlloySheet and PlateB265 Specification for Titanium and Titanium Alloy Strip,Sheet,and PlateD907 Terminology of AdhesivesE4 Practices for Force Verification of Testing MachinesE399 Test Method for Linear-Elastic Plane-Strain FractureToughness KIcof Metallic Materials3.Terminology3.1 Definitions:Many of the terms used in this test methodare defined in Terminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 crack-extension force,G,the system isolated(fixedload-displacement)loss of stress field energy for an infinitesi-mal increase,d A,of separational area.In equation form,GdA 5 2dUT(1)where UT=total elastic energy in the system(component ortest specimen).In the test specimens of this method,the crackfront is nearly straight through the specimen thickness,B,sothat dA=B da,where da is an infinitesimal forward motion ofthe leading edge of the crack.Completely linear-elastic behav-ior is assumed in the calculations(See Annex A1)of G used inthis method,an allowable assumption when the zone ofnonlinear deformation in the adhesive is small relative tospecimen dimensions and crack size.3.2.1.1 When the shear stress on the plane of crack andforward to its leading edge is zero,the stress state is termed“opening mode.”The symbol for an opening mode G is GIforplane-strain and G1when the connotation of plane-strain is notwanted.3.2.2 opening mode fracture toughness,G1cthe value of Gjust prior to onset of rapid fracturing when G is increasing withtime.3.2.3 opening mode crack arrest toughness,G1athe valueof G just after arrest of a run-arrest segment of crack extension.3.2.3.1 It is assumed that the dimensions of the part con-taining the crack are large compared to the run-arrest segment1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.80 on MetalBonding Adhesives.Current edition approved Oct.1,2012.Published October 2012.Originallyapproved in 1975.Last previous edition approved in 2005 as D3433 99(2005).DOI:10.1520/D3433-99R12.2The boldface numbers in parentheses refer to the references at the end of thistest method.3For 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.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 which precedes crack arrest and that the quasi-static stress fieldenclosing the crack tip just after crack arrest can be assumed incalculating G1a.4.Summary of Test Method4.1 This test method involves cleavage testing bondedspecimens such that a crack is made to extend by a tensile forceacting in a direction normal to the crack surface.4.2 Load versus load-displacement across the bondline isrecorded autographically.The G1and G1avalues are calculatedfrom this load by equations that have been established on thebasis of elastic stress analysis of