ASTM_D_2295_-_96_2008.pdf

Designation:D229596(Reapproved 2008)Standard Test Method forStrength Properties of Adhesives in Shear by TensionLoading at Elevated Temperatures(Metal-to-Metal)1This standard is issued under the fixed designation D2295;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 the com-parative shear strengths of adhesives for bonding metals whentested on a standard specimen and under specified conditions ofpreparation and testing at elevated temperatures.1.2 This test method is applicable to the temperature rangefrom 315 to 850C(600 to 1500F).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 consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A167 Specification for Stainless and Heat-ResistingChromium-Nickel Steel Plate,Sheet,and Strip(With-drawn 2014)3D638 Test Method for Tensile Properties of PlasticsD907 Terminology of AdhesivesD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading(Metal-to-Metal)2.2 Military Specifications:MIL-S-25043 Steel Plate,Sheet,and Strip43.Terminology3.1 Many terms in this test method are defined in Terminol-ogy D907.4.Significance and Use4.1 Comparative strength of adhesive bonds at elevatedtemperatures allows for better selection of adhesives that mustperform at temperatures above normal.This test method isuseful in supplying such information.5.Apparatus5.1 Testing Machine,conforming to the requirements of TestMethod D638.Use pin-type grips as shown in Fig.1 to hold thetest specimen.5.2 Heating Equipment,consisting of a radiant heat source,backed by a high-efficiency reflector for the purpose ofobtaining the desired heat flux.A suitable lamp arrangementfor heating a specimen is shown in Fig.2.6.Test Specimens6.1 Cut test specimens from panels shown in Fig.3(a).These test specimens form and dimensions are shown in Fig.3(b).The specimens are similar to the tension lap shearspecimen described in Fig.1 of Test Method D1002,exceptthat pin-type grips are used.6.2 Base the selection of materials on the test temperaturerange.The following grades of steel are recommended,al-though use of other types of heat-resistant steel is permitted:MetalDesignationSteel,corrosion-resistant(18-8)plate,sheet,andstripA167,Type 302Steel plate,sheet,and strip 17-7PH,TH 1050,cor-rosion-resistant,precipitation hardenedMIL-S-25043The nominal thickness for the sheet 1.270 mm(0.050 in.).7.Preparation of Test Specimens7.1 Cut test specimens as shown in Fig.3(b)to dimensionsfrom the test panel.Measure the width of the specimen and thelength of the overlap to the nearest 0.25 mm(0.01 in.).7.2 Prepare test specimens by bonding individual strips asshown in Fig.3(b).Machine unbonded individual strips to sizeand free from burrs or other irregularities.1This 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 1,2008.Published April 2008.Originallyapproved in 1964.Last previous edition approved in 2002 as D2295 96(2002).DOI:10.1520/D2295-96R08.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.3 Uniformly coat both sides of the dummy and testspecimens with carbon black as shown in Fig.3(b).8.Procedure8.1 Place the specimens in the pin-type grips of the testingmachine so that the long axis of the test specimen coincideswith the direction of applied pull through the center line of thegrip assembly.8.2 Heat the specimen uniformly in the bond area using aradiant source.Ensure that the required bondline temperature isreached within a prescribed period of time.8.3 Perform a temperature calibration on a dummy speci-men prior to test.Calibrate the bond temperature using twothermocouples positioned in the geometric center of the bond.Embed one thermocouple in the center of the bond ands