ASTM D6112-97(2005)
(Test Method)Standard Test Methods for Compressive and Flexural Creep and Creep-Rupture of Plastic Lumber and Shapes
Standard Test Methods for Compressive and Flexural Creep and Creep-Rupture of Plastic Lumber and Shapes
SIGNIFICANCE AND USE
Data from creep and creep-rupture tests are necessary to predict the creep modulus and strength of materials under long-term loads and to predict dimensional changes that may occur as a result of such loads.
Data from these test methods can be used to characterize plastic lumber: for comparison purposes, for the design of fabricated parts, to determine long-term performance under constant load, and under certain conditions, for specification purposes.
For many products, there may be a specification that requires the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that product specification before using this test method. Table 1 in Classification D 4000 lists the ASTM materials standards that currently exist.
SCOPE
1.1 These test methods cover the determination of the creep and creep-rupture properties of plastic lumber and shapes, when loaded in compression or flexure under specified environmental conditions. Test specimens in the "as-manufactured" form are employed. As such, these are test methods for evaluating the properties of plastic lumber or shapes as a product and not material property test methods.
1.2 Plastic lumber and plastic shapes are currently made predominantly with recycled plastics. However, this test method would also be applicable to similar manufactured plastic products made from virgin resins where the product is non-homogenous in the cross-section.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in brackets are for information only.
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.Note 1
There is no similar or equivalent ISO standard.
General Information
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6112 – 97 (Reapproved 2005)
Standard Test Methods for
Compressive and Flexural Creep and Creep-Rupture of
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Plastic Lumber and Shapes
This standard is issued under the fixed designation D6112; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope D4000 Classification System for Specifying Plastic Materi-
als
1.1 These test methods cover the determination of the creep
D5033 Guide for Development of ASTM Standards Relat-
and creep-rupture properties of plastic lumber and shapes,
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ing to Recycling and Use of Recycled Plastics
when loaded in compression or flexure under specified envi-
D5947 Test Methods for Physical Dimensions of Solid
ronmentalconditions.Testspecimensinthe“as-manufactured”
Plastics Specimens
form are employed. As such, these are test methods for
E4 Practices for Force Verification of Testing Machines
evaluating the properties of plastic lumber or shapes as a
product and not material property test methods.
3. Terminology
1.2 Plastic lumber and plastic shapes are currently made
3.1 Definitions:
predominantly with recycled plastics. However, this test
3.1.1 compression—in a compressive creep test, the de-
method would also be applicable to similar manufactured
crease in length produced in the gage length or the total length
plastic products made from virgin resins where the product is
of a test specimen.
non-homogenous in the cross-section.
3.1.2 creep modulus—the ratio of initial applied stress to
1.3 Thevaluesstatedininch–poundunitsaretoberegarded
creep strain.
as standard. The values given in parentheses are for informa-
3.1.3 creep strain—the total strain, at any given time,
tion only.
produced by the applied stress during a creep test.
1.4 This standard does not purport to address all of the
3.1.3.1 Discussion—The term creep, as used in this test
safety concerns, if any, associated with its use. It is the
method,reflectscurrentplasticsengineeringusage.Inscientific
responsibility of the user of this standard to establish appro-
practice, creep is often defined to be the nonelastic portion of
priate safety and health practices and determine the applica-
strain. However, this definition is not applicable to existing
bility of regulatory limitations prior to use.
engineering formulas. Plastics have a wide spectrum of retar-
NOTE 1—There is no similar or equivalent ISO standard.
dation times, and elastic portions of strain cannot be separated
in practice from nonelastic. Therefore, wherever “strain” is
2. Referenced Documents
mentioned in these test methods, it refers to the sum of elastic
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2.1 ASTM Standards:
strain plus the additional strain with time.
D543 Practices for Evaluating the Resistance of Plastics to
3.1.4 deflection—in a flexural creep test, the change in
Chemical Reagents
mid-span position of a test specimen.
D883 Terminology Relating to Plastics
3.1.5 deformation—a change in shape, size or position of a
D2990 Test Methods for Tensile, Compressive, and Flex-
test specimen as a result of compression, deflection, or exten-
ural Creep and Creep-Rupture of Plastics
sion:
3.1.6 plastic lumber, n—a manufactured product composed
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ofmorethan50weightpercentresin,andinwhichtheproduct
These test methods are under the jurisdiction of ASTM Committee D20 on
Plastics and are the direct responsibility of Subcommittee D20.20 on Plastic generally is rectangular in cross-section and typically supplied
Products (Section D20.20.01).
in board and dimensional lumber sizes, may be filled or
Current edition approved Nov. 1, 2005. Published January 2006. Originally
unfilled, and may be composed of single or multiple resin
approved in 1997. Last previous edition approved in 1997 as D6112-97. DOI:
blends.
10.1520/D6112-97R05.
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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
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Standards volume information, refer to the standard’s Document Summary page on Withdrawn. The last approved version of this historical standard is referenced
the ASTM website. on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6112 – 97 (2005)
3.1.7 plastic shape, n—a manufactured product composed to other specimens undergoing testing. The accuracy of the
ofmorethan50weightpercentresin,andinwhichtheproduct loading system shall be verified at least once each year in
generally is not rectangular in cross-section, may be filled or accordance with Practices E4.
unfilled, and may be composed o
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