ASTM D7264/D7264M-21
(Test Method)Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials
Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials
SIGNIFICANCE AND USE
5.1 This test method determines the flexural properties (including strength, stiffness, and load/deflection behavior) of polymer matrix composite materials under the conditions defined. Procedure A is used for three-point loading and Procedure B is used for four-point loading. This test method was developed for optimum use with continuous-fiber-reinforced polymer matrix composites and differs in several respects from other flexure methods, including the use of a standard span-to-thickness ratio of 32:1 versus the 16:1 ratio used by Test Methods D790 (a plastics-focused method covering three-point flexure) and D6272 (a plastics-focused method covering four-point flexure).
5.2 This test method is intended to interrogate long-beam strength in contrast to the short-beam strength evaluated by Test Method D2344/D2344M.
5.3 Flexural properties determined by these procedures can be used for quality control and specification purposes, and may find design applications.
5.4 These procedures can be useful in the evaluation of multiple environmental conditions to determine which are design drivers and may require further testing.
5.5 These procedures may also be used to determine flexural properties of structures.
SCOPE
1.1 This test method determines the flexural stiffness and strength properties of polymer matrix composites.
1.1.1 Procedure A—A three-point loading system utilizing center loading on a simply supported beam.
1.1.2 Procedure B—A four-point loading system utilizing two load points equally spaced from their adjacent support points, with a distance between load points of one-half of the support span.
Note 1: Unlike Test Method D6272, which allows loading at both one-third and one-half of the support span, in order to standardize geometry and simplify calculations, this standard permits loading at only one-half the support span.
1.2 For comparison purposes, tests may be conducted according to either test procedure, provided that the same procedure is used for all tests, since the two procedures generally give slightly different property values.
1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7264/D7264M − 21
Standard Test Method for
1
Flexural Properties of Polymer Matrix Composite Materials
This standard is issued under the fixed designation D7264/D7264M; 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 determines the flexural stiffness and
D790 Test Methods for Flexural Properties of Unreinforced
strength properties of polymer matrix composites.
and Reinforced Plastics and Electrical Insulating Materi-
1.1.1 Procedure A—A three-point loading system utilizing
als
center loading on a simply supported beam.
D792 Test Methods for Density and Specific Gravity (Rela-
1.1.2 Procedure B—A four-point loading system utilizing
tive Density) of Plastics by Displacement
two load points equally spaced from their adjacent support
D883 Terminology Relating to Plastics
points, with a distance between load points of one-half of the
D2344/D2344M Test Method for Short-Beam Strength of
support span.
PolymerMatrixCompositeMaterialsandTheirLaminates
D2584 Test Method for Ignition Loss of Cured Reinforced
NOTE 1—Unlike Test Method D6272, which allows loading at both
Resins
one-third and one-half of the support span, in order to standardize
geometry and simplify calculations, this standard permits loading at only
D2734 TestMethodsforVoidContentofReinforcedPlastics
one-half the support span.
D3171 Test Methods for Constituent Content of Composite
Materials
1.2 For comparison purposes, tests may be conducted ac-
D3878 Terminology for Composite Materials
cording to either test procedure, provided that the same
D5229/D5229M Test Method for MoistureAbsorption Prop-
procedure is used for all tests, since the two procedures
erties and Equilibrium Conditioning of Polymer Matrix
generally give slightly different property values.
Composite Materials
1.3 Units—The values stated in either SI units or inch-
D5687/D5687M Guide for Preparation of Flat Composite
pound units are to be regarded separately as standard. The
Panels with Processing Guidelines for Specimen Prepara-
values stated in each system are not necessarily exact equiva-
tion
lents; therefore, to ensure conformance with the standard, each
D6272 Test Method for Flexural Properties of Unreinforced
system shall be used independently of the other, and values
and Reinforced Plastics and Electrical Insulating Materi-
from the two systems shall not be combined. als by Four-Point Bending
D6856 Guide for Testing Fabric-Reinforced “Textile” Com-
1.4 This standard does not purport to address all of the
posite Materials
safety concerns, if any, associated with its use. It is the
E4 Practices for Force Verification of Testing Machines
responsibility of the user of this standard to establish appro-
E6 Terminology Relating to Methods of Mechanical Testing
priate safety, health, and environmental practices and deter-
E122 Practice for Calculating Sample Size to Estimate,With
mine the applicability of regulatory limitations prior to use.
Specified Precision, the Average for a Characteristic of a
1.5 This international standard was developed in accor-
Lot or Process
dance with internationally recognized principles on standard-
E177 Practice for Use of the Terms Precision and Bias in
ization established in the Decision on Principles for the
ASTM Test Methods
Development of International Standards, Guides and Recom-
E456 Terminology Relating to Quality and Statistics
3
mendations issued by the World Trade Organization Technical
2.2 Other Documents:
Barriers to Trade (TBT) Committee.
ANSI Y14.5-1999 Dimensioning and Tolerancing—
Includes Inch and Metric
1 2
This test method is under the jurisdiction of ASTM Committee D30 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Composite Materials and is the direct responsibility of Subcommittee D30.04 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Lamina and Laminate Test Methods. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Jan. 1, 2021. Published February 2021. Originally the ASTM website.
3
approved in 2006. Last previous edition approved in 2015 as D7264/D7264M – 15. Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
DOI: 10.1520/D7264_D7264M-21. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO B
...
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: D7264/D7264M − 15 D7264/D7264M − 21
Standard Test Method for
1
Flexural Properties of Polymer Matrix Composite Materials
This standard is issued under the fixed designation D7264/D7264M; 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 determines the flexural stiffness and strength properties of polymer matrix composites.
1.1.1 Procedure A—A three-point loading system utilizing center loading on a simply supported beam.
1.1.2 Procedure B—A four-point loading system utilizing two load points equally spaced from their adjacent support points, with
a distance between load points of one-half of the support span.
NOTE 1—Unlike Test Method D6272, which allows loading at both one-third and one-half of the support span, in order to standardize geometry and
simplify calculations, this standard permits loading at only one-half the support span.
1.2 For comparison purposes, tests may be conducted according to either test procedure, provided that the same procedure is used
for all tests, since the two procedures generally give slightly different property values.
1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the
inch-pound units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure
conformance with the standard, each system mustshall be used independently of the other. Combiningother, and values from the
two systems may result in nonconformance with the standard.shall not be combined.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D2344/D2344M Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates
1
This test method is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.04 on Lamina and
Laminate Test Methods.
Current edition approved April 1, 2015Jan. 1, 2021. Published May 2015February 2021. Originally approved in 2006. Last previous edition approved in 20072015 as
D7264/D7264M – 07.D7264/D7264M – 15. DOI: 10.1520/D7264_D7264M-15.10.1520/D7264_D7264M-21.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D7264/D7264M − 21
D2584 Test Method for Ignition Loss of Cured Reinforced Resins
D2734 Test Methods for Void Content of Reinforced Plastics
D3171 Test Methods for Constituent Content of Composite Materials
D3878 Terminology for Composite Materials
D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite
Materials
D5687/D5687M Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Preparation
D6272 Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by
Four-Point Bending
D6856 Guide for Testing Fabric-Reinforced “Textile” Composite Materials
E4 Practices for Force Verification of Testing Machines
E6 Terminology Relating to Methods of Mechanical Testing
E18 Test Metho
...
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