ASTM D6272-10
(Test Method)Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending
Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending
SIGNIFICANCE AND USE
Flexural properties determined by this test method are especially useful for quality control and specification purposes.
This test method may be more suited for those materials that do not fail within the strain limits imposed by Test Method D790. The major difference between four point and three point bending modes is the location of the maximum bending moment and maximum axial fiber stress. In four point bending the maximum axial fiber stress is uniformly distributed between the loading noses. In three point bending the maximum axial fiber stress is located immediately under the loading nose.
Flexural properties may vary with specimen depth, temperature, atmospheric conditions, and the difference in rate of straining specified in Procedures A and B.
Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters covered in the material specification, or both, shall take precedence over those mentioned in this test method. If there are no material specifications, then these default conditions apply. Table 1 in Classification D4000 lists the ASTM materials standards that currently exist.
SCOPE
1.1 This test method covers the determination of flexural properties of unreinforced and reinforced plastics, including high-modulus composites and electrical insulating materials in the form of rectangular bars molded directly or cut from sheets, plates, or molded shapes. These test methods are generally applicable to rigid and semirigid materials. However, flexural strength cannot be determined for those materials that do not break or that do not fail in the outer fibers. This test method utilizes a four point loading system applied to a simply supported beam.
1.2 This test method may be used with two procedures:
1.2.1 Procedure A, designed principally for materials that break at comparatively small deflections.
1.2.2 Procedure B, designed particularly for those materials that undergo large deflections during testing.
1.2.3 Procedure A shall be used for measurement of flexural properties, particularly flexural modulus, unless the material specification states otherwise. Procedure B may be used for measurement of flexural strength.
1.3 Comparative tests may be run according to either procedure, provided that the procedure is found satisfactory for the material being tested.
1.4 The values stated in SI units are to be regarded as the standard. The values provided in parentheses are for information only.
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.
Note 1—This test method is equivalent to ISO 14125 (Method B).
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Designation: D6272 − 10
Standard Test Method for
Flexural Properties of Unreinforced and Reinforced Plastics
1
and Electrical Insulating Materials by Four-Point Bending
This standard is issued under the fixed designation D6272; 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 flexural
D618 Practice for Conditioning Plastics for Testing
properties of unreinforced and reinforced plastics, including
D638 Test Method for Tensile Properties of Plastics
high-modulus composites and electrical insulating materials in
D790 Test Methods for Flexural Properties of Unreinforced
theformofrectangularbarsmoldeddirectlyorcutfromsheets,
and Reinforced Plastics and Electrical Insulating Materi-
plates, or molded shapes. These test methods are generally
als
applicable to rigid and semirigid materials. However, flexural
D883 Terminology Relating to Plastics
strength cannot be determined for those materials that do not
D4000 Classification System for Specifying Plastic Materi-
break or that do not fail in the outer fibers. This test method
als
utilizes a four point loading system applied to a simply
D5947 Test Methods for Physical Dimensions of Solid
supported beam.
Plastics Specimens
E4 Practices for Force Verification of Testing Machines
1.2 This test method may be used with two procedures:
E83 Practice for Verification and Classification of Exten-
1.2.1 Procedure A, designed principally for materials that
someter Systems
break at comparatively small deflections.
E691 Practice for Conducting an Interlaboratory Study to
1.2.2 Procedure B, designed particularly for those materials
Determine the Precision of a Test Method
that undergo large deflections during testing.
3
2.2 ISO Standard:
1.2.3 ProcedureAshall be used for measurement of flexural
ISO 14125 (Method B) Fibre-Reinforced Plastic
properties, particularly flexural modulus, unless the material
Composites—Determination of Flexural Properties
specification states otherwise. Procedure B may be used for
measurement of flexural strength.
3. Terminology
1.3 Comparative tests may be run according to either
3.1 Definitions:
procedure, provided that the procedure is found satisfactory for 3.1.1 Definitions of terms applying to these test methods
the material being tested.
appear in Terminology D883 and Annex A2 of Test Method
D638.
1.4 The values stated in SI units are to be regarded as the
standard. The values provided in parentheses are for informa-
4. Summary of Test Method
tion only.
4.1 A bar of rectangular cross section rests on two supports
1.5 This standard does not purport to address all of the
and is loaded at two points (by means of two loading noses),
safety concerns, if any, associated with its use. It is the
each an equal distance from the adjacent support point. The
responsibility of the user of this standard to establish appro-
distancebetweentheloadingnoses(theloadspan)iseitherone
priate safety and health practices and determine the applica-
third or one half of the support span (see Fig. 1). A support
bility of regulatory limitations prior to use.
span-to-depth ratio of 16:1 shall be used unless there is reason
to suspect that a larger span-to-depth ratio may be required, as
NOTE 1—This test method is equivalent to ISO 14125 (Method B).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2010. Published April 2010. Originally the ASTM website.
ε1 3
approved in 1998. Last previous edition approved in 2008 as D6272 - 02(2008) . Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
DOI: 10.1520/D6272-10. 4th Floor, New York, NY 10036, http://www.ansi.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 ----------------------
D6272 − 10
6. Apparatus
6.1 Testing Machine—Aproperly calibrated testing machine
that can be operated at constant rates of crosshead motion over
the range indicated, and in which the error in the load
measuring system shall not exceed 6 1 % of maximum load
expected to be measured. It shall be eq
...
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.
´1
Designation:D6272–02 (Reapproved 2008) Designation:D6272–10
Standard Test Method for
Flexural Properties of Unreinforced and Reinforced Plastics
1
and Electrical Insulating Materials by Four-Point Bending
This standard is issued under the fixed designation D6272; 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
´ NOTE—Editorially changed Note 1 in April 2008.
1. Scope*
1.1 This test method covers the determination of flexural properties of unreinforced and reinforced plastics, including
high-modulus composites and electrical insulating materials in the form of rectangular bars molded directly or cut from sheets,
plates, or molded shapes. These test methods are generally applicable to rigid and semirigid materials. However, flexural strength
cannot be determined for those materials that do not break or that do not fail in the outer fibers. This test method utilizes a four
point loading system applied to a simply supported beam.
1.2 This test method may be used with two procedures:
1.2.1 Procedure A, designed principally for materials that break at comparatively small deflections.
1.2.2 Procedure B, designed particularly for those materials that undergo large deflections during testing.
1.2.3 Procedure A shall be used for measurement of flexural properties, particularly flexural modulus, unless the material
specification states otherwise. Procedure B may be used for measurement of flexural strength.
1.3 Comparative tests may be run according to either procedure, provided that the procedure is found satisfactory for the
material being tested.
1.4 The values stated in SI units are to be regarded as the standard.The values provided in parentheses are for information only.
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.
NOTE 1—This test method is equivalent to ISO 14125 (Method B).
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D883 Terminology Relating to Plastics
D4000 Classification System for Specifying Plastic Materials
D4066Classification System for Nylon Injection and Extrusion Materials (PA)
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
E4 Practices for Force Verification of Testing Machines
E83 Practice for Verification and Classification of Extensometer Systems
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3
2.2 ISO Standard:
ISO 14125 (Method B) Fibre-Reinforced Plastic Composites—Determination of Flexural Properties
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
Current edition approved April 1, 2008. Published July 2008. Originally approved in 1998. Last previous edition approved in 2002 as D6272-02. DOI:
10.1520/D6272-02R08E01.
´1
Current edition approved April 1, 2010. Published April 2010. Originally approved in 1998. Last previous edition approved in 2008 as D6272 - 02(2008) . DOI:
10.1520/D6272-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.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 ----------------------
D6272–10
3. Terminology
3.1 Definitions:
3.1.1 Definitions of terms applying to these test methods appear in Terminology D883 and Annex A2 of Test Method D638.
4. Summary of Test Method
4.1 Abar of rectangular cross section rests on two supports and is loaded at two points (by means of t
...
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