ASTM D950-2003(2011) Standard Test Method for Impact Strength of Adhesive Bonds《胶粘剂抗冲击强度的标准试验方法》.pdf

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1、Designation: D950 03 (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

2、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 adhes

3、ive 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 t

4、he 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 su

5、rface 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

6、 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 a

7、pplied, 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 procedur

8、e 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 va

9、riables 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 test

10、ing.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 appr

11、o-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 M

12、achinesB107/B107M Specification for Magnesium-Alloy ExtrudedBars, Rods, Profiles, Tubes, and Wire1This 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. Pub

13、lished 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, ref

14、er to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.B133 Specification for Copper Rod, Bar, and Shapes3B139/B139M Specification for Phosphor Bronze Rod, Bar,and ShapesB151/B151

15、M Specification for Copper-Nickel-Zinc Alloy(Nickel Silver) and Copper-Nickel Rod and BarB211 Specification for Aluminum and Aluminum-AlloyBar, Rod, and WireD905 Test Method for Strength Properties of AdhesiveBonds in Shear by Compression LoadingD907 Terminology of AdhesivesE23 Test Methods for Notc

16、hed Bar Impact Testing ofMetallic 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 s

17、quareinch, 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 under a sudden impact load and notunder a slowly applied load of th

18、e same or greater force.4.2 This test method can be used to compare the sensitivityof various adhesives to suddenly applied loads.5. Apparatus5.1 Testing Machine:5.1.1 A pendulum-type impact machine with a hand veloc-ity of 3.4 m/s (11 ft/s), comprising essentially the following:5.1.1.1 Impact Head

19、equipped with a flat striking faceslightly wider than the test specimen, aligned to strike thespecimen full-face.5.1.1.2 Jig to hold the test specimen, as shown in Fig. 1.The jig illustrated is not suitable for use with all impactmachines and vises. Vary the dimensions and design of the jigas requir

20、ed for adaptation to machines and vises available,provided the following general requirements are met: Machinethe jig from a solid piece of steel and bolt it solidly to the baseof the testing machine. Drill the corners to ensure that the testspecimen sets flush against the retaining end of the jig.M

21、inimize the dirt collection at the drilled corners which couldhold the end of the specimen away from the face of the jig.Provide the jig with a screw to tighten the specimen in the jig,in order to minimize the tendency of the specimen to overturnwhen struck. Locate the jig so that the specimen will

22、be struckat the point of maximum head velocity.5.1.1.3 Vise or Bolts to hold the jig rigid and immobileunder the stress of the testing machine hammer with the totalheight of the vise, jig, and test specimen such that the loweredge of the striking face of the impact head strikes thespecimen as near t

23、he adhesive line as possible, preferablywithin 0.79 mm (132 in.). Ordinarily the distance between thetop of the jaws of the vise of the machine and the bottom of thestriking face of the head is 22 mm (0.866 in.), and properheight of the specimen may be obtained by adjusting its heightin the jig.5.1.

24、2 See Test Methods E23 for additional information onimpact testing machines and their calibration.5.2 Conditioning Room or DesiccatorsA conditioningroom capable of maintaining a relative humidity of 50 6 2%at 23 6 1.1C (73.4 6 2F), or desiccators filled with asaturated salt solution (Note 1) to give

25、 a relative humidity of 506 2 % at 23 6 1.1C.NOTE 1A saturated salt solution of calcium nitrate will give approxi-mately 51 % relative humidity at the test temperature.6. Test Specimens6.1 Metal-to-Metal Specimens:6.1.1 MaterialMetals conforming to the following speci-fications are recommended:Metal

26、 DesignationBrass ASTM B16/B16M, C36000; half-hard temperCopper ASTM B133, C11000; hard temperAluminum ASTM B211, A92024; G-3Steel AISI 1020, G10200; cold-finished barPhosphor bronze ASTM B139/B139M, C54400Magnesium ASTM B107/B107M, AZ61A or M1A-FNickel silver ASTM B151/B151M, C77000; quarter-hard6.

27、1.1.1 Run tests on adhesives with high-impact strengthpreferably on steel to minimize deformation. The reuse ofspecimens is allowed, provided that the face receiving theimpact is not deformed.6.1.2 Specimen Size, Shape, and AssemblyUse the testspecimen dimensions for metal-to-metal adhesives given i

28、nFig. 2(a), whenever possible. In cases where this specimencannot be fractured in the testing machine available, the squaredimensions of the 25.4 by 25.4-mm (1 by 1-in.) block may bereduced to a smaller square, keeping the dimensions of the 25.4by 44.5-mm (1 by 134-in.) block constant. Clearly state

29、 thedimensions of the specimen and bonded area in the report(Section 9). In any case, it is desirable that the specimen sizebe such as to give impact strengths that fall somewhere near themiddle range of the testing machine, since readings in thehighest and lowest ranges are often unreliable. Assemb

30、le thespecimen so the face receiving the impact load is at the pointof maximum velocity of the impact head. The impact face ofthe specimen is to be square and flat, perpendicular to the planeof the bond line, and parallel to the striking face of thependulum.6.1.3 BondingApply adhesive and pressure i

31、n accordancewith the procedure outlined by the manufacturer of theadhesive.6.1.3.1 Prepare areas that are to be bonded in accordancewith the recommendations of the manufacturer of the adhesive.6.1.4 ConditioningPreconditioning is not required formetal-to-metal bonds. The adhesive is ready for test p

32、urposeswhen it has been applied in accordance with 6.1.3 unlessotherwise specified by the manufacturer or the purchaser.6.1.5 Number of Test Specimens, Metal-to-Metal:3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.D950 03 (2011)26.1.5.1 Test ten test s

33、pecimens for each adhesive in the caseof metal-to-metal specimens.6.1.5.2 Discard specimens that break at a flaw remote fromthe bond line. Retest unless such flaws constitute a variable theeffect of which it is desired to study.7. Testing Procedure7.1 Place the specimen in the jig in the vise of the

34、 impactmachine so that the specimen butts squarely against theretaining end of the jig. Rest the impact head of the machinegently against the specimen and adjust the jig so that the headfits squarely against the impact face of the specimen.7.2 Raise the impact head to a predetermined height andrelea

35、se the safety catch. The impact energy absorbed by thespecimen may then be read directly.7.3 Record the following information:7.3.1 Record joules or foot pound-force of energy absorbedin producing failure of the specimen.7.3.2 Record bonded area of specimen.FIG. 1 Adapter Jig for Impact MachinesD950

36、 03 (2011)37.3.3 Record the percentages of cohesion, adhesion, andcontact failures (Note 2). This will be based on visual inspec-tion.NOTE 2Cohesion failure may be obtained by observing how much ofthe failure has occurred in the adhesive itself. That is, if the adhesive hasadhered to the metal test

37、pieces and no voids are visible, it represents a100 % cohesion failure. Adhesion failure refers to the lack of adhering tometals being fastened. Contact failure refers to lack of bond lines being incontact due to uneven surfaces, poor pressure distribution, etc.8. Calculation8.1 Calculate the impact

38、 strength of the specimen as theenergy absorbed in producing failure of the specimen dividedby the bonded area of the specimen, and express in joules persquare metre or foot pound-force per square inch. Report thevalues to the nearest 100 J/m2(0.1 ftlbf/in.2). Unit resultscannot be extended to diffe

39、rent areas than those tested.9. Report9.1 Report the following information:9.1.1 Complete identification of the adhesive tested, includ-ing type, source, manufacturers code numbers, form, etc.,9.1.2 Method of preparing test specimens, dimensions ofspecimens, and materials bonded,9.1.3 Average thickn

40、ess of adhesive layer after formation ofthe joint, within 0.03 mm (0.001 in.). Describe the method ofobtaining the thickness of the adhesive layer including proce-dure, location of measurements, and range of measurements.9.1.4 Conditioning procedure used,9.1.5 Atmosphere conditions in test room,9.1.

41、6 Number of specimens tested,9.1.7 Actual bonded area, and9.1.8 Maximum, minimum, and average value of impactstrength, or the cohesion, adhesion, and contact failures for themetal specimens.10. Precision and Bias10.1 Precision and bias for this test is being determined andwill be available by Septem

42、ber 2007.11. Keywords11.1 adhesive bonding; impact head; impact machine; im-pact strength; impact valueASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that d

43、etermination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved

44、 or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel

45、that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprin

46、ts (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 2 Block Shear Impact Test SpecimensD950 03 (2011)4