ASTM D6112-13
(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
5.1 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 have the potential to occur as a result of such loads.
5.2 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.
5.3 For many products, it is possible that there will 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 D4000 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 parentheses are for information only.
1.4 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 known ISO equivalent to this standard.
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Designation: D6112 − 13
Standard Test Methods for
Compressive and Flexural Creep and Creep-Rupture of
1
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* D5033GuideforDevelopmentofASTMStandardsRelating
to Recycling and Use of Recycled Plastics (Withdrawn
1.1 These test methods cover the determination of the creep
3
2007)
and creep-rupture properties of plastic lumber and shapes,
D5947Test Methods for Physical Dimensions of Solid
when loaded in compression or flexure under specified envi-
Plastics Specimens
ronmentalconditions.Testspecimensinthe“as-manufactured”
E4Practices for Force Verification of Testing Machines
form are employed. As such, these are test methods for
evaluating the properties of plastic lumber or shapes as a
3. Terminology
product and not material property test methods.
3.1 Definitions:
1.2 Plastic lumber and plastic shapes are currently made
3.1.1 compression—in a compressive creep test, the de-
predominantly with recycled plastics. However, this test
creaseinlengthproducedinthegaugelengthorthetotallength
method would also be applicable to similar manufactured
of a test specimen.
plastic products made from virgin resins where the product is
3.1.2 creep modulus—the ratio of initial applied stress to
non-homogenous in the cross-section.
creep strain.
1.3 Thevaluesstatedininch-poundunitsaretoberegarded
3.1.3 creep strain—the total strain, at any given time,
as standard. The values given in parentheses are for informa-
produced by the applied stress during a creep test.
tion only.
3.1.3.1 Discussion—The term creep, as used in this test
1.4 This standard does not purport to address all of the
method,reflectscurrentplasticsengineeringusage.Inscientific
safety concerns, if any, associated with its use. It is the
practice, creep is often defined to be the nonelastic portion of
responsibility of the user of this standard to establish appro-
strain. However, this definition is not applicable to existing
priate safety and health practices and determine the applica-
engineering formulas. Plastics have a wide spectrum of retar-
bility of regulatory limitations prior to use.
dation times, and elastic portions of strain cannot be separated
NOTE 1—There is no known ISO equivalent to this standard.
in practice from nonelastic. Therefore, wherever “strain” is
mentioned in these test methods, it refers to the sum of elastic
2. Referenced Documents
strain plus the additional strain with time.
2
2.1 ASTM Standards:
3.1.4 deflection—in a flexural creep test, the change in
D543Practices for Evaluating the Resistance of Plastics to
mid-span position of a test specimen.
Chemical Reagents
D883Terminology Relating to Plastics 3.1.5 deformation—a change in shape, size or position of a
D2990Test Methods forTensile, Compressive, and Flexural test specimen as a result of compression, deflection, or exten-
Creep and Creep-Rupture of Plastics sion:
D4000Classification System for Specifying Plastic Materi-
3.1.6 plastic lumber, n—a manufactured product made pri-
als
marily from plastic materials (filled or unfilled), typically used
as a building material for purposes similar to those of tradi-
1
These test methods are under the jurisdiction of ASTM Committee D20 on
tional lumber, which is usually rectangular in cross-section.
PlasticsandarethedirectresponsibilityofSubcommitteeD20.20onPlasticLumber
(Terminology D883)
(Section D20.20.01).
3.1.6.1 Discussion—Plastic lumber is typically supplied in
Current edition approved June 1, 2013. Published June 2013. Originally
sizes similar to those of traditional lumber board, timber and
approved in 1997. Last previous edition approved in 2010 as D6112-10. DOI:
10.1520/D6112-13.
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6112 − 13
dimension lumber; however the tolerances for plastic lumber of the desired load. The loading mechanism must allow
and for traditional lumber are not necessarily the same. reproductivelyrapidandsmoothloadingasspecifiedin11.1.3.
(Terminology D883) In cr
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6112 − 10 D6112 − 13
Standard Test Methods for
Compressive and Flexural Creep and Creep-Rupture of
1
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. 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 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 parentheses are for information
only.
1.4 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 known ISO equivalent to this standard.
2. Referenced Documents
2
2.1 ASTM Standards:
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
D883 Terminology Relating to Plastics
D2990 Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics
D4000 Classification System for Specifying Plastic Materials
3
D5033 Guide for Development of ASTM Standards Relating to Recycling and Use of Recycled Plastics (Withdrawn 2007)
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
E4 Practices for Force Verification of Testing Machines
3. Terminology
3.1 Definitions:
3.1.1 compression—in a compressive creep test, the decrease in length produced in the gauge length or the total length of a test
specimen.
3.1.2 creep modulus—the ratio of initial applied stress to creep strain.
3.1.3 creep strain—the total strain, at any given time, produced by the applied stress during a creep test.
3.1.3.1 Discussion—The term creep, as used in this test method, reflects current plastics engineering usage. In scientific practice,
creep is often defined to be the nonelastic portion of strain. However, this definition is not applicable to existing engineering
1
These test methods are under the jurisdiction of ASTM Committee D20 on Plastics and are the direct responsibility of Subcommittee D20.20 on Plastic Lumber (Section
D20.20.01).
Current edition approved Sept. 1, 2010June 1, 2013. Published September 2010June 2013. Originally approved in 1997. Last previous edition approved in 19972010 as
D6112 - 97D6112 - 10.(2005). DOI: 10.1520/D6112-10.10.1520/D6112-13.
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 the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6112 − 13
formulas. Plastics have a wide spectrum of retardation times, and elastic portions of strain cannot be separated in practice from
nonelastic. Therefore, wherever “strain” is mentioned in these test methods, it refers to the sum of elastic strain plus the additional
strain with time.
3.1.4 deflection—in a flexural creep test, the change in mid-span position of a test specimen.
3.1.5 deformation—a change in shape, size or position of a test specimen as a result of compression, deflection, or extension:
3.1.6 plastic lumber, n—a manufactured product composed of more than 50 weight percent resin, and in which the product
generally is rectangular in cross-section and typically supplied in board and dimensional lumber sizes, may bem
...
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