ASTM D4761-05

Standard Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material

SIGNIFICANCE AND USE
These test methods provide procedures that are applicable under true field conditions, such as in a plant with specimens not at moisture equilibrium.
The data established by these test methods can be used as follows:
4.2.1 Develop strength and stiffness properties for the population represented by the material being tested (that is, individual grades, grade combinations, species, species groups, or any other defined, identifiable sample).
4.2.2 Confirm the validity of strength and stiffness properties for the population represented by the material being tested.
4.2.3 Investigate the effect of parameters that may influence the strength and stiffness properties of the material, such as moisture content, temperature, knot size and location, or slope of grain.
The procedures chosen in accordance with these test methods shall be fully documented in the report to facilitate correlation with test results obtained through the use of traditional procedures, such as those set forth in Test Methods D 198.
SCOPE
Note 1—A proof load may be used, which will permit the determination of a specified strength percentile without testing the total sample to destruction. Designing a test program on the basis of proof loading can be complex, requiring consideration in relation to the objectives of the test program. Guidance on this matter can be found in the paper by Johnson.
1.1 These test methods cover the determination of the mechanical properties of stress-graded lumber and other wood-base structural material.
1.2 These test methods appear in the following order: SectionBending edge-wiseBending flat-wise:Center point loadingThird point loading Axial strength in tensionAxial strength in compression
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: 31-Mar-2005
• ICS: 79.040 - Wood, sawlogs and sawn timber
• ICS: 79.060.01 - Wood-based panels in general
• Technical Committee: D07 - Wood
• Drafting Committee: D07.01 - Fundamental Test Methods and Properties

Relations

• Replaced By: ASTM D4761-11 - Standard Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material
• Effective Date: 15-Jul-2011

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:D4761–05
Standard Test Methods for
Mechanical Properties of Lumber and Wood-Base Structural
1
Material
This standard is issued under the fixed designation D4761; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (ϵ) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Numerous evaluations of the mechanical properties of wood-based structural material have been
satisfactorilyconductedsincethelate1920s,usingTestMethodsD198.Thosemethodsarebestsuited
to a laboratory environment and are adaptable to a variety of products such as stress-graded lumber,
sawn timber, laminated timbers, wood-plywood composite members, reinforced and prestressed
timbers.
The procedures presented in these test methods have been derived from those set forth in Test
Methods D198. They are intended primarily for application to stress-graded lumber, but can be used
for other wood-base structural material as well. The procedures are more flexible than those in Test
Methods D198, making testing in a nonlaboratory environment more feasible. Thus the test methods
can be used on production sites for field testing and quality control, as well as in laboratories for
research applications. Key differences from Test Methods D198 are the testing speed, the deflection-
measuringproceduresfortestspecimensunderload,andthedetailofdatareporting.Furthermore,the
test methods do not require that specimens be loaded to failure (Note 1).
Since these test methods allow latitude in testing procedures, the procedures used shall be fully
documented in the test report. It may also be desirable to correlate the results from tests carried out
according to these test methods with test results obtained through the use of a traditional procedure,
such as that set forth in Test Methods D198.
1. Scope
Axial strength in compression 30-35
NOTE 1—A proof load may be used, which will permit the determina- 1.3 This standard does not purport to address all of the
tion of a specified strength percentile without testing the total sample to
safety concerns, if any, associated with its use. It is the
destruction.Designingatestprogramonthebasisofproofloadingcanbe
responsibility of the user of this standard to establish appro-
complex, requiring consideration in relation to the objectives of the test
priate safety and health practices and determine the applica-
2
program. Guidance on this matter can be found in the paper by Johnson.
bility of regulatory limitations prior to use.
1.1 These test methods cover the determination of the
2. Referenced Documents
mechanicalpropertiesofstress-gradedlumberandotherwood-
3
base structural material.
2.1 ASTM Standards:
1.2 These test methods appear in the following order:
D9 Terminology Relating to Wood and Wood-Based Prod-
Section
ucts
Bending edge-wise 6-11
D198 Test Methods of Static Tests of Lumber in Structural
Bending flat-wise:
Sizes
Center point loading 12-17
Third point loading 18-23 D2915 Practice for Evaluating Allowable Properties for
Axial strength in tension 24-29
Grades of Structural Lumber
D4442 Test Methods for Direct Moisture Content Measure-
ment of Wood and Wood-Base Materials
1
These test methods are under the jurisdiction of ASTM Committee D07 on E4 Practices for Force Verification of Testing Machines
Wood and are the direct responsibility of Subcommittee D07.01 on Fundamental
Test Methods & Properties.
Current edition approved April 1, 2005. Published April 2005. Originally
3
approved in 1988. Last previous edition approved in 2002 as D4761–02a. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/D4761-05. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
2
Johnson, R.A., “Current Statistical Methods for Estimating Lumber Properties Standards volume information, refer to the standard’s Document Summary page on
by Proof Loading,” Forest Products Journal, Vol 30, No. 1, 1980, pp. 14–22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4761–05
E6 TerminologyRelatingtoMethodsofMechanicalTesting BENDING EDGE-WISE
E177 Practice for Use of the Terms Precision and Bias in
6. Scope
ASTM Test Methods
4
6.1 This test method provides procedures for the determi-
2.2 Other Document:
nationofthestrengthandmodulusofelasticityofstress-graded
NIST Voluntary Product Standard PS20 American Soft-
lumber and other wood-base structural material in bending
wood Lumber Standard
edge-wise.
NOTE 2—The current version of PS20 is given as an example of a
product standard applicable t
...