ASTM D2293-96
(Test Method)Standard Test Method for Creep Properties of Adhesives in Shear by Compression Loading (Metal-to-Metal)
Standard Test Method for Creep Properties of Adhesives in Shear by Compression Loading (Metal-to-Metal)
SCOPE
1.1 This test method covers the determination of the creep properties of adhesives for bonding metals when tested on a standard specimen and subjected to certain conditions of temperature and compressive stress in a spring-loaded testing apparatus.
1.2 The values stated in SI units are to be regarded as standard. The inch-pound units in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
Designation: D 2293 – 96
Standard Test Method for
Creep Properties of Adhesives in Shear by Compression
1
Loading (Metal-to-Metal)
This standard is issued under the fixed designation D 2293; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method covers the determination of the creep 5.1 Compression Creep Test Apparatus, as shown in Fig. 1
properties of adhesives for bonding metals when tested on a and Fig. 2.
standard specimen and subjected to certain conditions of 5.2 Microscope, calibrated, with Filar microeyepiece and
temperature and compressive stress in a spring-loaded testing 103 objective lens.
apparatus.
6. Test Specimens
1.2 The values stated in SI units are to be regarded as
6.1 Test specimens shall conform to the form and dimen-
standard. The inch-pound units in parentheses are for informa-
sions shown in Fig. 3. These specimens are similar to the
tion only.
1.3 This standard does not purport to address all of the tension lap shear specimens described in Test Method D 1002,
except that the length of either side of the shear area shall be
safety concerns, if any, associated with its use. It is the
1 1
responsibility of the user of this standard to establish appro- 6.35 mm ( ⁄4 in.) rather than 88.9-mm (3 ⁄2-in.) minimum.
6.2 A complete description of these specimens and the
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. method of preparation is given in Sections 6, 7, and 8 of Test
Method D 1002.
2. Referenced Documents
6.3 For creep measurements, polish the edges of the bonded
2.1 ASTM Standards: area of each test specimen, and scribe with three fine lines
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D 907 Terminology of Adhesives across the bondline.
D 1002 Test Method for Apparent Shear Strength of Single-
7. Procedure
Lap-Joint Adhesively Bonded Metal Specimens by Ten-
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sion Loading (Metal-to-Metal) 7.1 To conduct a creep test, center the specimen within the
slot between the washer and bushing of the apparatus as shown
3. Terminology
in Fig. 1. Compress the spring between the two bushings to the
3.1 Definitions—Many terms in this test method are defined desired load by tightening the nut. The correct load can be
in Terminology D 907. applied by deflecting the spring a given measured amount as
determined from a calibration curve.
4. Significance and Use
7.2 To measure total deflection, observe the average dis-
4.1 This test method is useful in research and development placement of fine razor scratches across the centers of both
for comparison of creep properties of adhesives, particularly as sides of the lap joints with a calibrated microscope having a
those properties are affected by changes in adhesive formula-
Filar microeyepiece and a 103 objective lens.
tion or expected service conditions, including temperature, 7.3 If the spring load is allowed to continue to compress the
moisture level, and duration of loading.
specimen, the observed initial deflection will be followed by a
4.2 The relative size and simplicity of design of the spring- continued increasing deflection with time. To provide a com-
loaded apparatus permits easy portability and transfer from one
plete history of creep behavior, measure these deflections
environment to the next without disturbing static loads. periodically with the calibrated microscope for as long as the
4.3 The relative simplicity of design with inexpensive
test is allowed to continue or until the adhesive joint fails.
materials permits replication of creep tests at relatively low 7.4 If a creep curve at other than room temperature is
costs.
required, perform both the specimen loading and its subsequent
exposure while holding the specimen to the desired tempera-
ture. A suitable oven or cold box may be used for this purpose.
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This test method is under the jurisdiction of ASTM Committee D-14 on
Under these conditions, the actual creep measurements are
Adhesives and is the direct responsibility of Subcomitteee D14.80 on Metal
Bonding Adhesives. more difficult to obtain. This can be done, however, in one of
Current edition approved Sept. 10, 1996. Published November 1996. Originally
two ways. The microscopic measurements can be made
published as D 2293 – 64 T. Last previous edition D 2293 – 92.
quickly and the specimen and its apparatus returned to its
2
Annual Book of ASTM Standards, Vol 15.06.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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D 2293
A—Slotted bolt
B—Bushing
C—Spring—piano wire cylindrical helical compression spring with six active
FIG. 2 Compression Creep Test Apparatus, Details
coils, eight total coils, wound closed, ground square, and cadmium pla
...
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