ASTM D7336/D7336M-12
(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
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.
The procedures contained within this standard 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.
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.
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).
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 facings 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 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D7336/D7336M − 12
StandardTest 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 C274 Terminology of Structural Sandwich Constructions
D883 Terminology Relating to Plastics
1.1 This test method determines the static energy absorption
D3878 Terminology for Composite Materials
properties (compressive crush stress and crush stroke) of
D5229/D5229M TestMethodforMoistureAbsorptionProp-
honeycomb sandwich core materials. These properties are
erties and Equilibrium Conditioning of Polymer Matrix
usuallydeterminedfordesignpurposesinadirectionnormalto
Composite Materials
the plane of facings as the honeycomb core material would be
E4 Practices for Force Verification of Testing Machines
placed in a structural sandwich construction.
E6 Terminology Relating to Methods of Mechanical Testing
1.2 Permissible core materials are limited to those in hon-
E18 Test Methods for Rockwell Hardness of Metallic Ma-
eycomb form.
terials
1.3 This test method is not intended for use in crush testing
E122 Practice for Calculating Sample Size to Estimate,With
of stabilized honeycomb core materials (for which the facing
Specified Precision, the Average for a Characteristic of a
plane surfaces of the honeycomb core material are dipped in
Lot or Process
resin to resist local crushing) or sandwich specimens (for
E177 Practice for Use of the Terms Precision and Bias in
which facings are bonded to the honeycomb core material).
ASTM Test Methods
1.4 The values stated in either SI units or inch-pound units
E456 Terminology Relating to Quality and Statistics
are to be regarded separately as standard. The values stated in
E1309 Guide for Identification of Fiber-Reinforced
each system may not be exact equivalents; therefore, each
Polymer-Matrix Composite Materials in Databases
system shall be used independently of the other. Combining
E1434 Guide for Recording Mechanical Test Data of Fiber-
values from the two systems may result in non-conformance
Reinforced Composite Materials in Databases
with the standard.
E1471 Guide for Identification of Fibers, Fillers, and Core
1.4.1 Within the text the inch-pound units are shown in
Materials in Computerized Material Property Databases
brackets.
1.5 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1 Definitions—Terminology D3878 defines terms relating
priate safety and health practices and determine the applica- to high-modulus fibers and their composites. Terminology
bility of regulatory limitations prior to use.
C274 defines terms relating to structural sandwich construc-
tions. Terminology D883 defines terms relating to plastics.
2. Referenced Documents
Terminology E6 defines terms relating to mechanical testing.
2
2.1 ASTM Standards:
Terminology E456 and Practice E177 define terms relating to
C271/C271M Test Method for Density of Sandwich Core
statistics.Intheeventofaconflictbetweenterms,Terminology
Materials
D3878 shall have precedence over the other terminologies.
NOTE 1—If the term represents a physical quantity, its analytical
1
This test method is under the jurisdiction of ASTM Committee D30 on
dimensionsarestatedimmediatelyfollowingtheterm(orlettersymbol)in
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
fundamental dimension form, using the following ASTM standard sym-
Sandwich Construction.
bology for fundamental dimensions, shown within square brackets: [M]
Current edition approved April 1, 2012. Published May 2012. Originally
approved in 2007. Last previous edition approved in 2007 as D7336/D7336M – 07. for mass, [L] for length, [T] for time, [θ] for thermodynamic temperature,
DOI: 10.1520/D7336_D7336M-12.
and[nd]fornon-dimensionalquantities.Useofthesesymbolsisrestricted
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to analytical dimensions when used with square brackets, as the symbols
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
may have other definitions when used without the brackets.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 3.2 Definitions of Terms Specific to This Standard:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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...
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:D7336/D7336M–07 Designation: D7336/D7336M – 12
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
honeycombsandwichcorematerials.Thesepropertiesareusuallydeterminedfordesignpurposesinadirectionnormaltotheplane
of facings 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 edges 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 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 aremay not be exact equivalents; therefore, each system
mustshall be used independently of the other. Combining values from the two systems may result in non-conformance with the
standard.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C271/C271M Test Method for Density of Sandwich Core Materials
C274 Terminology of Structural Sandwich Constructions
D883 Terminology Relating to Plastics
D3878 Terminology for Composite Materials
D5229/D5229M Test Method for MoistureAbsorption Properties and Equilibrium Conditioning of Polymer Matrix Composite
Materials
E4 Practices for Force 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
E1309 Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databases
E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases
E1471 Guide for Identification of Fibers, Fillers, and Core Materials in Computerized Material Property Databases
3. Terminology
3.1 Definitions—Terminology D3878 defines terms relating to high-modulus fibers and their composites. Terminology C274
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 May 1, 2007. Published May 2007. DOI: 10.1520/D7336_D7336M-07.
Current edition approved April 1, 2012. Published May 2012. Originally approved in 2007. Last previous edition approved in 2007 as D7336/D7336M – 07. DOI:
10.1520/D7336_D7336M-12.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D7336/D7336M – 12
defines terms relating to structural 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, its analytical dimensions are stated immediately follow
...
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