ASTM D6272-17
(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
5.1 Flexural properties determined by this test method are especially useful for quality control and specification purposes.
5.2 This test method is recommended 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.
5.3 Flexural properties vary with specimen depth, temperature, atmospheric conditions, and the difference in rate of straining specified in Procedures A and B.
5.4 Before proceeding with this test method, reference 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 describes two procedures (Procedure A and Procedure B), the selection of which depends on the behavior of the sample to be tested as explained below:
1.2.1 Procedure A, designed principally for materials that break at comparatively small deflections. It shall be used for measurement of flexural properties, particularly flexural modulus, unless the material specification states otherwise.
1.2.2 Procedure B, designed particularly for those materials that undergo large deflections during testing. It is suitable for measurement of flexural strength.
1.3 Comparative tests are permitted to 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 similar to ISO 14125, Method B. However, ISO 14125, Method B specifies only a load span of 1/3 the support span whereas D6272 also permits a load span of 1/2 the support span. For this reason and other differences in technical content, exercise extreme care if attempting to compare results between the two test methods.
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Designation: D6272 − 17
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.
span. For this reason and other differences in technical content, exercise
1. Scope*
extreme care if attempting to compare results between the two test
1.1 This test method covers the determination of flexural
methods.
properties of unreinforced and reinforced plastics, including
2. Referenced Documents
high-modulus composites and electrical insulating materials in
2
theformofrectangularbarsmoldeddirectlyorcutfromsheets,
2.1 ASTM Standards:
plates, or molded shapes. These test methods are generally
D618 Practice for Conditioning Plastics for Testing
applicable to rigid and semirigid materials. However, flexural
D638 Test Method for Tensile Properties of Plastics
strength cannot be determined for those materials that do not
D790 Test Methods for Flexural Properties of Unreinforced
break or that do not fail in the outer fibers. This test method
and Reinforced Plastics and Electrical Insulating Materi-
utilizes a four point loading system applied to a simply
als
supported beam.
D883 Terminology Relating to Plastics
D4000 Classification System for Specifying Plastic Materi-
1.2 This test method describes two procedures (ProcedureA
als
and Procedure B), the selection of which depends on the
D5947 Test Methods for Physical Dimensions of Solid
behavior of the sample to be tested as explained below:
Plastics Specimens
1.2.1 Procedure A, designed principally for materials that
E4 Practices for Force Verification of Testing Machines
break at comparatively small deflections. It shall be used for
E83 Practice for Verification and Classification of Exten-
measurement of flexural properties, particularly flexural
someter Systems
modulus, unless the material specification states otherwise.
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. It is suitable for
3
2.2 ISO Standard:
measurement of flexural strength.
ISO 14125 (Method B) Fibre-Reinforced Plastic
1.3 Comparative tests are permitted to be run according to
Composites—Determination of Flexural Properties
either procedure, provided that the procedure is found satisfac-
tory for the material being tested.
3. Terminology
1.4 The values stated in SI units are to be regarded as the
3.1 Definitions:
standard. The values provided in parentheses are for informa-
3.1.1 Definitions of terms applying to these test methods
tion only.
appear in Terminology D883 and Annex A2 of Test Method
D638.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 4.1 A bar of rectangular cross section rests on two supports
bility of regulatory limitations prior to use. and is loaded at two points (by means of two loading noses),
each an equal distance from the adjacent support point. The
NOTE 1—This test method is similar to ISO 14125, Method B.
1 distancebetweentheloadingnoses(theloadspan)iseitherone
However, ISO 14125, Method B specifies only a load span of ⁄3 the
1
third or one half of the support span (see Fig. 1). A support
support span whereas D6272 also permits a load span of ⁄2 the support
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 March 1, 2017. Published March 2017. Originally the ASTM website.
3
approved in 1998. Last previous edition approved in 2010 as D6272 - 10. DOI: Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/D6272-17. 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
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D6272 − 17
apply. Table 1 in Classificatio
...
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: D6272 − 10 D6272 − 17
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*
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: describes two procedures (Procedure A and Procedure B), the selection
of which depends on the behavior of the sample to be tested as explained below:
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.
1.2.1 Procedure A, Procedure A designed principally for materials that break at comparatively small deflections. It 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.
1.2.2 Procedure B, designed particularly for those materials that undergo large deflections during testing. It is suitable for
measurement of flexural strength.
1.3 Comparative tests may are permitted to 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).similar to ISO 14125, Method B. However, ISO 14125, Method B specifies only
1 1
a load span of ⁄3 the support span whereas D6272 also permits a load span of ⁄2 the support span. For this reason and other differences in technical content,
exercise extreme care if attempting to compare results between the two test methods.
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
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
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, 2010March 1, 2017. Published April 2010March 2017. Originally approved in 1998. Last previous edition approved in 20082010 as
ε1
D6272 - 02D6272 - 10.(2008) . DOI: 10.1520/D6272-10.10.1520/D6272-17.
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.
*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 − 17
3
2.2 ISO Standard:
ISO 14125 (Method B) Fib
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