ASTM D950-03(2020)e1

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
´1
Designation: D950 − 03 (Reapproved 2020)
Standard Test Method for
Impact Strength of Adhesive Bonds
This standard is issued under the fixed designation D950; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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.
ε NOTE—Section 10 was editorially corrected in January 2020.
INTRODUCTION
The accuracy of the results of strength tests of adhesive bonds will depend on the conditions under
which the bonding process is carried out. Unless otherwise agreed upon between the manufacturer and
the purchaser, the bonding conditions shall be prescribed by the manufacturer of the adhesive. In order
to ensure that complete information is available to the individual conducting the tests, the
manufacturer of the adhesive shall furnish numerical values and other specific information for each of
the following variables:
(1)Procedureforpreparationofsurfacespriortoapplicationoftheadhesivethecleaninganddrying
of metal surfaces, and special surface treatments such as sanding which 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 or thickness of film,
number of coats to be applied, whether to be applied to one or both surfaces, and the conditions of
drying where more than one coat is required.
(4) Assembly conditions before application of pressure, including the room temperature, length of
time, 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 under
pressure and the temperature of the assembly when under pressure. It should be stated whether this
temperature 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 the
length of time, temperature, and relative humidity.
Arange may be prescribed for any variable by the manufacturer of the adhesive if it can be assumed
by the test operator that any arbitrarily chosen value within such a range or any combination of such
values for several variables will be acceptable to both the manufacturer and the purchaser of the
adhesive.
1. Scope tested on standard specimens under specified conditions of
preparation, conditioning, and testing.
1.1 This test method covers the determination of the com-
parative impact strength of adhesive bonds in shear, when 1.2 The values stated in SI units are to be regarded as the
standard. The values in parentheses are for information only.
1.3 This standard does not purport to address all of the
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.80 on Metal
safety concerns, if any, associated with its use. It is the
Bonding Adhesives.
responsibility of the user of this standard to establish appro-
Current edition approved Jan. 1, 2020. Published February 2020. Originally
priate safety, health, and environmental practices and deter-
approved in 1952. Last previous edition approved in 2011 as D950 – 03 (2011).
DOI: 10.1520/D0950-03R20E01. mine the applicability of regulatory limitations prior to use.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
D950 − 03 (2020)
1.4 This international standard was developed in accor- 5.1.1.1 Impact Head equipped with a flat striking face
dance with internationally recognized principles on standard- slightly wider than the test specimen, aligned to strike the
ization established in the Decision on Principles for the specimen full-face.
Development of International Standards, Guides and Recom- 5.1.1.2 Jigtoholdthetestspecimen,asshowninFig.1.The
mendations issued by the World Trade Organization Technical
jig illustrated is not suitable for use with all impact machines
Barriers to Trade (TBT) Committee. andvises.Varythedimensionsanddesignofthejigasrequired
for adaptation to machines and vises available, provided the
2. Referenced Documents
following general requirements are met: Machine the jig from
2.1 ASTM Standards: a solid piece of steel and bolt it solidly to the base of the testing
machine. Drill the corners to ensure that the test specimen sets
A108 Specification for Steel Bar, Carbon and Alloy, Cold-
flush against the retaining end of the jig. Minimize the dirt
Finished
collection at the drilled corners which could hold the end of the
B16/B16M Specification for Free-Cutting Brass Rod, Bar
specimen away from the face of the jig. Provide the jig with a
and Shapes for Use in Screw Machines
screw to tighten the specimen in the jig, in order to minimize
B107/B107M Specification for Magnesium-Alloy Extruded
the tendency of the specimen to overturn when struck. Locate
Bars, Rods, Profiles, Tubes, and Wire
the jig so that the specimen will be struck at the point of
B133 Specification for Copper Rod, Bar,And Shapes (With-
maximum head velocity.
drawn 1994)
5.1.1.3 Vise or Bolts to hold the jig rigid and immobile
B139/B139M Specification for Phosphor Bronze Rod, Bar,
and Shapes under the stress of the testing machine hammer with the total
height of the vise, jig, and test specimen such that the lower
B151/B151M Specification for Copper-Nickel-Zinc Alloy
(Nickel Silver) and Copper-Nickel Rod and Bar edge of the striking face of the impact head strikes the
specimen as near the adhesive line as possible, preferably
B211 Specification for Aluminum and Aluminum-Alloy
Rolled or Cold-Finished Bar, Rod, and Wire (Metric) within 0.79 mm ( ⁄32 in.). Ordinarily the distance between the
B0211_B0211M top of the jaws of the vise of the machine and the bottom of the
D905 Test Method for Strength Properties of Adhesive striking face of the head is 22 mm (0.866 in.), and proper
Bonds in Shear by Compression Loading height of the specimen may be obtained by adjusting its height
in the jig.
D907 Terminology of Adhesives
E23 Test Methods for Notched Bar Impact Testing of Me- 5.1.2 See Test Methods E23 for additional information on
tallic Materials impact testing machines and their calibration.
5.2 Conditioning Room or Desiccators—A conditioning
3. Terminology
room capable of maintaining a relative humidity of 50 62%
3.1 Definitions—Many terms in this test method are defined
at 23 6 1.1°C (73.4 6 2°F), or desiccators filled with a
in Terminology D907.
saturatedsaltsolution(Note1)togivearelativehumidityof50
3.2 Definitions of Terms Specific to This Standard: 6 2 % at 23 6 1.1°C.
3.2.1 impact strength, n—the energy absorbed expressed in
NOTE 1—A saturated salt solution of calcium nitrate will give approxi-
joules per square metre or foot-pounds-force (ft-lbf) per square
mately 51 % relative humidity at the test temperature.
inch, by a specimen of standard design when impacted to
failure by
...