Standard Test Method for Resistance to Creep of Adhesives in Static Shear by Compression Loading (Wood-to-Wood)

SIGNIFICANCE AND USE
5.1 This test method evaluates the performance of the adhesive in laminated wood as measured by resistance to creep under static load.  
5.2 Test results from the evaluation of adhesive creep resistance, under designated environmental conditions of the test, provide a measure of the adhesive’s ability to withstand constant loading over a relatively long period of time.  
5.3 Creep measured with this test method is normally used in conjunction with specifications such as, but not limited to Specification D2559 and CSA O112.9 to confirm suitability of an adhesive to resist creep under designed loads when subjected to specific levels of stress, load duration and environmental conditions.
SCOPE
1.1 This test method covers the determination of creep properties of structural adhesives in wood-to-wood bonds when a standardized specimen is subjected to shearing stresses at various levels of static load, constant temperature, and relative humidity. Apparatus and procedures are provided for shear deformation (creep) of adhesive bonds under static load. This test method is used under the indicated conditions to evaluate resistance to creep properties of a structural wood adhesive.  
1.2 The test method is used to evaluate creep performance of adhesives suitable for the bonding of wood, including treated wood, into structural wood products for general construction, marine use, or for other uses where a high-strength general construction, creep-resistant, durable adhesive bond is required. Individual block shear specimens are prepared from adhesively bonded laminations, subjected to a constant load under various combinations of temperature and relative humidity, and the amount of creep measured.  
1.3 Creep of structural wood adhesives as measured by this test method may not be comparative to other ASTM methods and is limited to the conditions of the test and procedures contained herein.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.5 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.

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Publication Date
31-Oct-2014
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Drafting Committee
Current Stage
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ASTM D7966/D7966M-14 - Standard Test Method for Resistance to Creep of Adhesives in Static Shear by Compression Loading (Wood-to-Wood)
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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: D7966/D7966M − 14
StandardTest Method for
Resistance to Creep of Adhesives in Static Shear by
1
Compression Loading (Wood-to-Wood)
This standard is issued under the fixed designation D7966/D7966M; 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.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the determination of creep
D905Test Method for Strength Properties of Adhesive
properties of structural adhesives in wood-to-wood bonds
Bonds in Shear by Compression Loading
when a standardized specimen is subjected to shearing stresses
D907Terminology of Adhesives
at various levels of static load, constant temperature, and
D1101Test Methods for Integrity of Adhesive Joints in
relative humidity. Apparatus and procedures are provided for
Structural Laminated Wood Products for Exterior Use
shear deformation (creep) of adhesive bonds under static load.
D2395TestMethodsforDensityandSpecificGravity(Rela-
This test method is used under the indicated conditions to
tive Density) of Wood and Wood-Based Materials
evaluate resistance to creep properties of a structural wood
D2559Specification for Adhesives for Bonded Structural
adhesive.
Wood Products for Use Under Exterior Exposure Condi-
1.2 The test method is used to evaluate creep performance
tions
of adhesives suitable for the bonding of wood, including
D4442Test Methods for Direct Moisture Content Measure-
treated wood, into structural wood products for general
ment of Wood and Wood-Based Materials
construction, marine use, or for other uses where a high-
E4Practices for Force Verification of Testing Machines
strengthgeneralconstruction,creep-resistant,durableadhesive 3
2.2 Other Document:
bond is required. Individual block shear specimens are pre-
CSA O112.9Evaluation of Adhesives for Structural Wood
pared from adhesively bonded laminations, subjected to a
Products (Exterior Exposure)
constant load under various combinations of temperature and
2.3 ASTM Adjuncts:
relative humidity, and the amount of creep measured. 4
Compression-Shear Creep Test Apparatus
1.3 Creep of structural wood adhesives as measured by this
3. Terminology
test method may not be comparative to other ASTM methods
and is limited to the conditions of the test and procedures 3.1 Definitions: Many terms in this test method are defined
in Terminology D907.
contained herein.
3.1.1 laminated wood, n—the fabricated product resulting
1.4 The values stated in either SI units or inch-pound units
from the bonding of two or more laminations, with each
are to be regarded separately as standard. The values stated in
lamination made from one or more pieces bonded either
each system may not be exact equivalents; therefore, each
lengthwise, edgewise, or both, and all with the direction of the
system shall be used independently of the other. Combining
grain essentially parallel, to form a larger piece such as a
values from the two systems may result in non-conformance
structural member.
with the standard.
3.1.1.1 Discussion—Laminated wood as defined in D1101.
1.5 This standard does not purport to address all of the
3.1.2 stress, n—the force exerted per unit area at a point
safety concerns, if any, associated with its use. It is the
within a plane.
responsibility of the user of this standard to establish appro-
3.2 Definitions of Terms Specific to This Standard:
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
1
This test method is under the jurisdiction of ASTM Committee D14 on the ASTM website.
3
Adhesives and is the direct responsibility of Subcommittee D14.30 on Wood Available from APA – The Engineered Wood Association, 7011 S.19th St.,
Adhesives. Tacoma, WA 98466-5333, www.apawood.org.
4
Current edition approved Nov. 1, 2014. Published March 2015. DOI: 10.1520/ Available from ASTM International Headquarters. Order Adjunct No. ADJ-
D7966_D7966-14. ADJD4680. Original adjunct produced in 1987.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D7966/D7966M − 14
3.2.1 average creep of specimen, n—calculated creep dis- 5.2 Test results from the evaluation of adhesive creep
placement in the bondline of a specimen as shown in Fig. 1 resistance, under designated environment
...

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