ASTM D905-08(2013)

Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading

SIGNIFICANCE AND USE
4.1 It cannot be assumed that this test method measures the true shear strength of the adhesive bond. Many factors interfere or bias the measurement including the strength of the wood, the specimen, the shear tool designs themselves, and the rate of loading.  
4.1.1 Wood failure is very common in joints made with strong adhesives. Although high wood failure is normally desired, when it occurs the measured strength is lower than the true adhesive bond strength.  
4.1.2 Stress concentrations at the notches of the specimen tend to lower the measured strength. In a similar test for the shear strength of solid wood, Test Methods D143, these effects are self correcting so that the measured strength is close to the true shear strength of the wood. By analogy the same may be true in this test method, however, other factors are also involved and may alter the relationship.  
4.1.3 The rate of loading affects the strength of an adhesive bond according to the adhesive's rheological properties. The more viscoelastic or plastic the adhesive, the greater effect. Thermosetting adhesives like urea- and phenol-formaldehyde are elastic. Their bond strengths can be measured over a range of loading rate from 0.038 to 1.27 cm/min [0.015 to 0.5 in./min] with no apparent affect. Thermoplastic adhesives like polyvinyl acetate, hot melts, and elastomer-based adhesives exhibit a broad range of elastic, viscoelastic, and plastic behaviors. Their bond strengths will be affected to varying degrees by changing the loading rate. Generally, increasing the rate, increases the measured strength.  
4.2 This test method is suitable for product research and development, qualifying adhesives in accordance with certain product or performance specifications, and monitoring bonding process control. This test method may be suitable for comparing and selecting adhesives, however, such comparisons must be made with caution since the measured strength of some adhesives may be different in different types o...
SCOPE
1.1 This test method covers the determination of the comparative shear strengths of adhesive bonds used for bonding wood and other similar materials, when tested on a standard specimen under specified conditions of preparation, conditioning, and loading in compression. This test method is intended primarily as an evaluation of adhesives for wood.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in brackets are provided for information purposes 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

• Status: Historical
• Publication Date: 30-Sep-2013
• ICS: 83.180 - Adhesives
• Technical Committee: D14 - Adhesives
• Drafting Committee: D14.30 - Wood Adhesives

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D905 − 08 (Reapproved 2013)
Standard Test Method for
Strength Properties of Adhesive Bonds in Shear by
1
Compression Loading
This standard is issued under the fixed designation D905; 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.
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 by 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) The moisture content of the wood at the time of bonding.
(2) Complete mixing directions for the adhesive.
(3) Conditions for applications 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 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.
Arangemaybeprescribedforanyvariablebythemanufactureroftheadhesiveifitcanbeassumed
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 1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method covers the determination of the com-
responsibility of the user of this standard to establish appro-
parative shear strengths of adhesive bonds used for bonding
priate safety and health practices and determine the applica-
wood and other similar materials, when tested on a standard
bility of regulatory limitations prior to use.
specimen under specified conditions of preparation,
conditioning, and loading in compression. This test method is
2. Referenced Documents
intended primarily as an evaluation of adhesives for wood.
2
2.1 ASTM Standards:
1.2 The values stated in SI units are to be regarded as the
D143 Test Methods for Small Clear Specimens of Timber
standard. The values given in brackets are provided for
D907 Terminology of Adhesives
information purposes only.
1
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.30 on Wood
2
Adhesives. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2013. Published October 2013. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
ε1
approved in 1947. Last previous edition approved in 2008 as D905 – 08 . DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D0905-08R13. the ASTM website.
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D905 − 08 (2013)
FIG. 1 Shearing Tool
D5266 Practice for Estimating the Percentage of Wood productorperformancespecifications,andmonitoringbonding
Failure in Adhesive Bonded Joints process control. This test method may be suitable for compar-
ing and selecting adhesives, however, such comparisons must
3. Terminology
be made with caution since the measured strength of some
adhesives may be different in different types of joints. Strength
3.1 Definitions—Many terms in this test method are defined
values obtained by this test method are not suitable as design
in Terminology D907.
shear strengths values without adjustment by certain engineer-
4. Significance and Use
ing design factors.
4.1 It cannot be assumed that this test method measures the
5. Apparatus
trueshearstrengthoftheadhesivebond.Manyfact
...