ASTM_D_950_-_03_2011.pdf

Designation:D95003(Reapproved 2011)Standard Test Method forImpact Strength of Adhesive Bonds1This standard is issued under the fixed designation D950;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.This standard has been approved for use by agencies of the U.S.Department of Defense.INTRODUCTIONThe accuracy of the results of strength tests of adhesive bonds will depend on the conditions underwhich the bonding process is carried out.Unless otherwise agreed upon between the manufacturer andthe purchaser,the bonding conditions shall be prescribed by the manufacturer of the adhesive.In orderto ensure that complete information is available to the individual conducting the tests,themanufacturer of the adhesive shall furnish numerical values and other specific information for each ofthe following variables:(1)Procedure for preparation of surfaces prior to application of the adhesive the cleaning anddrying of metal surfaces,and special surface treatments such as sanding which are not specificallylimited by the pertinent test method.(2)Complete mixing directions for the adhesive.(3)Conditions for application of the adhesive including the rate of spread or thickness of film,number of coats to be applied,whether to be applied to one or both surfaces,and the conditions ofdrying where more than one coat is required.(4)Assembly conditions before application of pressure,including the room temperature,length oftime,and whether open or closed assembly is to be used.(5)Curing conditions,including the amount of pressure to be applied,the length of time underpressure and the temperature of the assembly when under pressure.It should be stated whether thistemperature is that of the bond line,or of the atmosphere at which the assembly is to be maintained.(6)Conditioning procedure before testing,unless a standard procedure is specified,including thelength of time,temperature,and relative humidity.Arange may be prescribed for any variable by the manufacturer of the adhesive if it can be assumedby the test operator that any arbitrarily chosen value within such a range or any combination of suchvalues for several variables will be acceptable to both the manufacturer and the purchaser of theadhesive.1.Scope1.1 This test method covers the determination of the com-parative impact strength of adhesive bonds in shear,whentested on standard specimens under specified conditions ofpreparation,conditioning,and testing.1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.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:2A108 Specification for Steel Bar,Carbon and Alloy,Cold-FinishedB16/B16M Specification for Free-Cutting Brass Rod,Barand Shapes for Use in Screw Machines1This 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 April 1,2011.Published April 2011.Originallyapproved in 1952.Last previous edition approved in 2003 as D950 03.DOI:10.1520/D0950-03R11.2For 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 B107/B107M Specification for Magnesium-Alloy ExtrudedBars,Rods,Profiles,Tubes,and WireB133 Specification for Copper Rod,Bar,And Shapes(With-drawn 1994)3B139/B139M Specification for Phosphor Bronze Rod,Bar,and ShapesB151/B151M Specification for Copper-Nickel-Zinc Alloy(Nickel Silver)and Copper-Nickel Rod and BarB211 Specification for Aluminum and Aluminum-AlloyRolled or Cold Finished Bar,Rod,and WireD905 Test Method for Strength Properties of AdhesiveBonds in Shear by Compression LoadingD907 Terminology of AdhesivesE23 Test Methods for Notched Bar Impact Testing of Me-tallic Materials3.Terminology3.1 DefinitionsMany terms in this test method are definedin Terminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 impact strength,nthe energy absorbed expressed injoules per square metre or foot-pounds-force(ft-lbf)per squareinch,by a specimen of standard design when impacted tofailure by a single blow of a testing-machine hammer.(Syn-onym impact value.)3.2.2 impact value,nsynonym for impact strength.4.Significance and Use4.1 Adhesives can fail