ASTM_D_1184_-_98_2012.pdf

Designation:D118498(Reapproved 2012)Standard Test Method forFlexural Strength of Adhesive Bonded LaminatedAssemblies1This standard is issued under the fixed designation D1184;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 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 by the manufacturer and thepurchaser,the bonding conditions shall be prescribed by the manufacturer of the adhesive.In order toensure that complete information is available to the individual conducting the tests,the manufacturerof the adhesive shall furnish numerical values and other specific information for each of the followingvariables:(1)Procedure for preparation of surfaces prior to application of the adhesive,including the moisturecontent of wood,the cleaning and drying of metal surfaces,and special surface treatments such assanding that are not specifically limited by the pertinent test method.(2)Complete mixing directions for the adhesive.(3)Conditions for application of the adhesive including the rate of spread of 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 glue 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 properties of either metal or wood adhesive bondedassemblies when subjected to flexural stresses with standardshape specimens and under defined conditions of pretreatment,temperature,relative humidity,and testing technique.The testspecimen and testing technique were designed to develop alarge portion of shear forces between the laminae of the testpiece when the load is applied,rather than to reduce shearstress to a minimum as is done in otherASTM test methods forflexural properties.This method is not applicable to assembliesmade with nonrigid adherends.The data obtained are notsuitable for design work.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationpurposes.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is the1This 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 May 1,2012.Published May 12.Originally approvedin 1951.Last previous edition approved in 2004 as D1184 98(2004).DOI:10.1520/D1184-98R12.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 responsibility 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:2D907 Terminology of AdhesivesE4 Practices for Force Verification of Testing Machines3.Terminology3.1 DefinitionsMany terms in this test method are definedin Terminology D907.4.Summary of Test Method4.1 Test a specimen composed of eight bonded plies as asimple beam loaded at the mid-span.Test at conditions ofstandard temperature and humidity.Specimen flexural proper-ties are compared by generating maximum shear stress in metalspecimens and flexural strength of wood specimens usingstandard formulas.5.Significance and Use5.1 This test method is designed for both wood and metalbonded specimens.5.2 The test method provides a means to compare flexuralproperties between assemblies.5.3 The data are reduced to a comparable basis by means ofthe formulas given in 11.1 and 11.2.It is recognized that theseformulas do not apply rigidly to tests made in the mannerdescribed in this method,but serve only to reduce the data toa co