ASTM D6112-10
(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 have the potential to 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, 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 − 10
StandardTest 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
3.1.5 deformation—a change in shape, size or position of a
D883Terminology Relating to Plastics
test specimen as a result of compression, deflection, or exten-
D2990Test Methods forTensile, Compressive, and Flexural
sion:
Creep and Creep-Rupture of Plastics
D4000Classification System for Specifying Plastic Materi- 3.1.6 plastic lumber, n—a manufactured product composed
ofmorethan50weightpercentresin,andinwhichtheproduct
als
generally is rectangular in cross-section and typically supplied
in board and dimensional lumber sizes, may be filled or
1
These test methods are under the jurisdiction of ASTM Committee D20 on
unfilled, and may be composed of single or multiple resin
PlasticsandarethedirectresponsibilityofSubcommitteeD20.20onPlasticLumber
(Section D20.20.01).
blends.
Current edition approved Sept. 1, 2010. Published September 2010. Originally
3.1.7 plastic shape, n—a manufactured product composed
approved in 1997. Last previous edition approved in 1997 as D6112-97(2005).
DOI: 10.1520/D6112-10.
ofmorethan50weightpercentresin,andinwhichtheproduct
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6112 − 10
generally is not rectangular in cross-section, may be filled or shock loading, caused by a specimen failure, is not transferred
unfilled, and may be composed of single or multiple resin to other specimens undergoing testing. The accuracy of the
blends. loading system shall be verified at least on
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D6112–97(Reapproved2005) Designation: D6112 – 10
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
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 Plasticlumberandplasticshapesarecurrentlymadepredominantlywithrecycledplastics.However,thistestmethodwould
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.
NOTE1—There is no similar or equivalent ISO standard. 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
D5033 Guide for Development of ASTM Standards Relating to Recycling and Use of Recycled Plastics
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,thedecreaseinlengthproducedinthegaugelengthorthetotallengthofatest
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 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:
1
ThesetestmethodsareunderthejurisdictionofASTMCommitteeD20onPlasticsandarethedirectresponsibilityofSubcommitteeD20.20onPlasticProductsLumber
(Section D20.20.01).
Current edition approved Nov.Sept. 1, 2005.2010. Published January 2006.September 2010. Originally approved in 1997. Last previous edition approved in 1997 as
D6112-97(2005). DOI: 10.1520/D6112-97R05.10.1520/D6112-10.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6112 – 10
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 be filled or unfilled,
and may be composed of single or multiple resin blends.
3.1.7 plastic shape, n—a manufactured product composed of more than 50 weight percent resin, and in which the produc
...
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