ASTM_D_5041_-_98_2012.pdf

Designation:D504198(Reapproved 2012)Standard Test Method forFracture Strength in Cleavage of Adhesives in BondedJoints1This standard is issued under the fixed designation D5041;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 covers the determination of fracturestrength in cleavage of adhesive bonds when tested on standardreinforced plastic specimens and under specified conditions ofpreparation and testing(Note 1).NOTE1While this test method is intended for use in reinforced plasticapplications,it may be used for measuring fracture properties of adhesivesusing other plastic adherends,provided consideration is given to thethickness and should be of equal rigidity to the plastic adherends.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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:2D618 Practice for Conditioning Plastics for TestingD907 Terminology of AdhesivesD2093 Practice for Preparation of Surfaces of Plastics Priorto Adhesive BondingD5573 Practice for Classifying Failure Modes in Fiber-Reinforced-Plastic(FRP)JointsE4 Practices for Force Verification of Testing Machines3.Terminology3.1 DefinitionsMany of the terms used in this test methodare defined in Terminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 failure initiation energy,Eithe area under the loaddeflection curve where the first significant load drop occursafter the start of the test,showing the onset of permanentdamage to the bonded assembly(see Fig.1).3.2.2 failure propagation energy,Epthe area under theload-deflection curve beginning at the failure initiation energyand ending at the catastrophic failure of the bonded assembly.(See Fig.1).3.2.3 semirigidindicates that the adherends shall havesuch dimensions and physical properties as to permit bendingthem through any angle of up to 30 without breaking orcracking.3.2.4 semirigid adherend,nan adherend that has dimen-sions and physical properties that permit bending at designatedtest temperature through any angle up to 30 without breakingor cracking.3.2.5 total energyfailure initiation energy plus failurepropagation energy.4.Significance and Use4.1 This test method provides a means of measuring thecleavage forces and energies required to fail adhesively bondedreinforced flat bonded specimens.It also offers a semi-quantitative observation of failure mode.4.2 This test method has found application in screeningstructural adhesives for bonding reinforced plastics wheresimple lap shear testing has proven to be inadequate indistinguishing differences between adhesives.4.3 It is important to note that the test method measuresperformance properties of the total bonded system(forexample,reinforced plastic and adhesive)but will not yieldfundamental properties of the adhesive alone.5.Apparatus5.1 Testing Machine,any suitable testing machine capableof control of constant-rate-of-crosshead movement and com-prising essentially the following:5.1.1 Drive Mechanism,a mechanism for imparting to thecross-head movable member,a uniform,controlled velocitywith respect to the base(fixed member);this velocity is to beregulated as specified in Section 10.1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.40 on Adhesives forPlastics.Current edition approved May 1,2012.Published May 2012.Originallyapproved in 1990.Last previous edition approved in 2004 as D5041 98(2004).DOI:10.1520/D5041-98R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.2 Load Indicator,a mechanism capable of showing thetotal compressive load carried by the test specimen.Themechanism is to be essentially free from inertia-lag at thespecified rate of testing and indicate the load with an accuracyof 61%of the maximum indicated value of the test(load).Verify the accuracy of the testing machine at least once a yearin accordance with Practices E4.5.2 Wedge,made of either aluminum or steel with anincluded angle of 45.The sides of the wedge are machinedsmooth with the edge having a radius not to exceed 0.02 mm(0.01 in).NOTE2A stainless steel wedge is reco