ASTM D7336/D7336M-22
(Test Method)Standard Test Method for Static Energy Absorption Properties of Honeycomb Sandwich Core Materials
Standard Test Method for Static Energy Absorption Properties of Honeycomb Sandwich Core Materials
SIGNIFICANCE AND USE
5.1 Sandwich honeycomb core materials are used extensively in energy absorption applications, due to their ability to sustain compressive loading while being crushed. Proper design of energy absorption devices utilizing sandwich honeycomb core materials requires knowledge of the compressive crush stress and crush stroke properties of the honeycomb core material.
5.2 The procedures contained within this test method are intended to assess the crush stress and crush stroke properties of the sandwich honeycomb core material under static compressive loading. The dynamic crush stress of the honeycomb core material may vary from that measured under static loading, depending upon factors such as honeycomb core material thickness, core material density, impact velocity, etc.
5.3 This test method provides a standard method of obtaining the compressive crush stress and crush stroke for sandwich honeycomb core material structural design properties, material specifications, research and development applications, and quality assurance.
5.4 This test method is not intended for use in crush testing of stabilized honeycomb core materials (for which the facing plane surfaces of the honeycomb core material are dipped in resin to resist local crushing) or sandwich specimens (for which face sheets are bonded to the honeycomb core material).
5.5 Factors that influence the compressive crush stress and crush stroke and shall therefore be reported include the following: honeycomb core material, methods of material fabrication, core material geometry (nominal cell size), core material density, specimen geometry, specimen preparation, specimen conditioning, environment of testing, specimen alignment, pre-crush procedure, pre-crush depth, loading procedure, and speed of testing.
SCOPE
1.1 This test method determines the static energy absorption properties (compressive crush stress and crush stroke) of honeycomb sandwich core materials. These properties are usually determined for design purposes in a direction normal to the plane of the face sheets (also referred to as the facing plane) as the honeycomb core material would be placed in a structural sandwich construction.
1.2 Permissible core materials are limited to those in honeycomb form.
1.3 This test method is not intended for use in crush testing of stabilized honeycomb core materials (for which the facing plane surfaces of the honeycomb core material are dipped in resin to resist local crushing) or sandwich specimens (for which facings are bonded to the honeycomb core material).
1.4 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.
1.4.1 Within the text, the inch-pound units are shown in brackets.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 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.
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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: D7336/D7336M − 22
Standard Test Method for
Static Energy Absorption Properties of Honeycomb
1
Sandwich Core Materials
This standard is issued under the fixed designation D7336/D7336M; 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
1.1 This test method determines the static energy absorption 2.1 ASTM Standards:
properties (compressive crush stress and crush stroke) of C271/C271M Test Method for Density of Sandwich Core
honeycomb sandwich core materials. These properties are Materials
usuallydeterminedfordesignpurposesinadirectionnormalto D883 Terminology Relating to Plastics
theplaneofthefacesheets(alsoreferredtoasthefacingplane) D3878 Terminology for Composite Materials
as the honeycomb core material would be placed in a structural D5229/D5229M Test Method for MoistureAbsorption Prop-
sandwich construction. erties and Equilibrium Conditioning of Polymer Matrix
Composite Materials
1.2 Permissible core materials are limited to those in hon-
E4 Practices for Force Calibration and Verification of Test-
eycomb form.
ing Machines
1.3 This test method is not intended for use in crush testing
E6 Terminology Relating to Methods of Mechanical Testing
of stabilized honeycomb core materials (for which the facing
E18 Test Methods for Rockwell Hardness of Metallic Ma-
plane surfaces of the honeycomb core material are dipped in
terials
resin to resist local crushing) or sandwich specimens (for
E122 Practice for Calculating Sample Size to Estimate,With
which facings are bonded to the honeycomb core material).
Specified Precision, the Average for a Characteristic of a
1.4 Units—The values stated in either SI units or inch- Lot or Process
E177 Practice for Use of the Terms Precision and Bias in
pound units are to be regarded separately as standard. The
values stated in each system are not necessarily exact equiva- ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
lents; therefore, to ensure conformance with the standard, each
system shall be used independently of the other, and values
3. Terminology
from the two systems shall not be combined.
1.4.1 Within the text, the inch-pound units are shown in
3.1 Definitions—Terminology D3878 defines terms relating
brackets.
to high-modulus fibers and their composites, as well as terms
relating to sandwich constructions. Terminology D883 defines
1.5 This standard does not purport to address all of the
terms relating to plastics. Terminology E6 defines terms
safety concerns, if any, associated with its use. It is the
relating to mechanical testing. Terminology E456 and Practice
responsibility of the user of this standard to establish appro-
E177 define terms relating to statistics. In the event of a
priate safety, health, and environmental practices and deter-
conflict between terms, Terminology D3878 shall have prece-
mine the applicability of regulatory limitations prior to use.
dence over the other terminologies.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
NOTE 1—If the term represents a physical quantity, its analytical
ization established in the Decision on Principles for the
dimensionsarestatedimmediatelyfollowingtheterm(orlettersymbol)in
fundamental dimension form, using the following ASTM standard sym-
Development of International Standards, Guides and Recom-
bology for fundamental dimensions, shown within square brackets: [M]
mendations issued by the World Trade Organization Technical
for mass, [L] for length, [T] for time, [θ] for thermodynamic temperature,
Barriers to Trade (TBT) Committee.
and[nd]fornon-dimensionalquantities.Useofthesesymbolsisrestricted
to analytical dimensions when used with square brackets, as the symbols
may have other definitions when used without the brackets.
1
This test method is under the jurisdiction of ASTM Committee D30 on
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
2
Sandwich Construction. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2022. Published May 2022. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2007. Last previous edition approved in 2016 as D7336/D7336M – 16. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D7336_D7336M-22. the ASTM website.
Copyright © AS
...
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: D7336/D7336M − 16 D7336/D7336M − 22
Standard Test Method for
Static Energy Absorption Properties of Honeycomb
1
Sandwich Core Materials
This standard is issued under the fixed designation D7336/D7336M; 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 static energy absorption properties (compressive crush stress and crush stroke) of honeycomb
sandwich core materials. These properties are usually determined for design purposes in a direction normal to the plane of facings
as the the face sheets (also referred to as the facing plane) as the honeycomb core material would be placed in a structural sandwich
construction.
1.2 Permissible core materials are limited to those in honeycomb form.
1.3 This test method is not intended for use in crush testing of stabilized honeycomb core materials (for which the facing plane
surfaces of the honeycomb core material are dipped in resin to resist local crushing) or sandwich specimens (for which facings are
bonded to the honeycomb core material).
1.4 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 mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be
used independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.4.1 Within the text, the inch-pound units are shown in brackets.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 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:
C271/C271M Test Method for Density of Sandwich Core Materials
D883 Terminology Relating to Plastics
1
This test method is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.09 on Sandwich
Construction.
Current edition approved April 1, 2016May 1, 2022. Published April 2016May 2022. Originally approved in 2007. Last previous edition approved in 20122016 as
D7336/D7336M – 12.D7336/D7336M – 16. DOI: 10.1520/D7336_D7336M-16.10.1520/D7336_D7336M-22.
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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D7336/D7336M − 22
D3878 Terminology for Composite Materials
D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite
Materials
E4 Practices for Force Calibration and Verification of Testing Machines
E6 Terminology Relating to Methods of Mechanical Testing
E18 Test Methods for Rockwell Hardness of Metallic Materials
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or
Process
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
3. Terminology
3.1 Definitions—Terminology D3878 defines terms relating to high-modulus fibers and their composites, as well as terms relating
to sandwich constructions. Terminology D883 defines terms relating to plastics. Terminology E6 defines terms relating to
mechanical testing. Terminology E456 and Practice E177 define terms relating to statistics. In the event of a conflict between terms,
Terminology D3878 shall have precedence over the other terminologies.
NOTE 1—If the term represents a physical quantity, i
...
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