ASTM D7336/D7336M-16

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 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.  
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 facings 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 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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2016
• ICS: 83.140.99 - Other rubber and plastics products
• Technical Committee: D30 - Composite Materials
• Drafting Committee: D30.09 - Sandwich Construction

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7336/D7336M − 16
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 D883 Terminology Relating to Plastics
D3878 Terminology for Composite Materials
1.1 This test method determines the static energy absorption
D5229/D5229M Test Method for MoistureAbsorption Prop-
properties (compressive crush stress and crush stroke) of
erties and Equilibrium Conditioning of Polymer Matrix
honeycomb sandwich core materials. These properties are
Composite Materials
usuallydeterminedfordesignpurposesinadirectionnormalto
E4 Practices for Force Verification of Testing Machines
the plane of facings as the honeycomb core material would be
E6 Terminology Relating to Methods of Mechanical Testing
placed in a structural sandwich construction.
E18 Test Methods for Rockwell Hardness of Metallic Ma-
1.2 Permissible core materials are limited to those in hon-
terials
eycomb form.
E122 Practice for Calculating Sample Size to Estimate,With
1.3 This test method is not intended for use in crush testing
Specified Precision, the Average for a Characteristic of a
of stabilized honeycomb core materials (for which the facing
Lot or Process
plane surfaces of the honeycomb core material are dipped in
E177 Practice for Use of the Terms Precision and Bias in
resin to resist local crushing) or sandwich specimens (for
ASTM Test Methods
which facings are bonded to the honeycomb core material).
E456 Terminology Relating to Quality and Statistics
1.4 The values stated in either SI units or inch-pound units
3. Terminology
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each
3.1 Definitions—Terminology D3878 defines terms relating
system shall be used independently of the other. Combining
to high-modulus fibers and their composites, as well as terms
values from the two systems may result in non-conformance
relating to sandwich constructions. Terminology D883 defines
with the standard.
terms relating to plastics. Terminology E6 defines terms
1.4.1 Within the text the inch-pound units are shown in
relating to mechanical testing. Terminology E456 and Practice
brackets.
E177 define terms relating to statistics. In the event of a
1.5 This standard does not purport to address all of the
conflict between terms, Terminology D3878 shall have prece-
safety concerns, if any, associated with its use. It is the
dence over the other terminologies.
responsibility of the user of this standard to establish appro-
NOTE 1—If the term represents a physical quantity, its analytical
priate safety and health practices and determine the applica-
dimensionsarestatedimmediatelyfollowingtheterm(orlettersymbol)in
bility of regulatory limitations prior to use.
fundamental dimension form, using the following ASTM standard sym-
bology for fundamental dimensions, shown within square brackets: [M]
2. Referenced Documents
for mass, [L] for length, [T] for time, [θ] for thermodynamic temperature,
2
2.1 ASTM Standards:
and[nd]fornon-dimensionalquantities.Useofthesesymbolsisrestricted
C271/C271M Test Method for Density of Sandwich Core to analytical dimensions when used with square brackets, as the symbols
may have other definitions when used without the brackets.
Materials
3.2 Definitions of Terms Specific to This Standard:
1
This test method is under the jurisdiction of ASTM Committee D30 on
3.2.1 cell size [L], n—in a honeycomb core, the distance
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
between two parallel and opposite cell walls at node bond
Sandwich Construction.
areas, measured transverse to the ribbon direction.
Current edition approved April 1, 2016. Published April 2016. Originally
approved in 2007. Last previous edition approved in 2012 as D7336/D7336M – 12.
3.2.2 node bond area, n—in a honeycomb core, the area
DOI: 10.1520/D7336_D7336M-16.
2 betweentwocellsatwhichthecomponentwallsofthecellsare
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
bonded or attached.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 3.3 Symbols:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D7336/D7336M − 16
honeycomb core material structural design
...

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 − 12 D7336/D7336M − 16
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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C271/C271M Test Method for Density of Sandwich Core Materials
3
C274 Terminology of Structural Sandwich Constructions (Withdrawn 2016)
D883 Terminology Relating to Plastics
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 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
E1309 Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databases (Withdrawn 2015)
3
E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases (Withdrawn 2015)
E1471 Guide for Identification of Fibers, Fillers, and Core Materials in Computerized Material Property Databases (Withdrawn
3
2015)
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, 2012April 1, 2016. Published May 2012April 2016. Originally approved in 2007. Last previous edition approved in 20072012 as
D7336/D7336M – 07.D7336/D7336M – 12. DOI: 10.1520/D7336_D7336M-12.10.1520/D7336_D7336M-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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 − 16
3. Terminology
3.1 Definitions—Terminology D3878 defines terms relating to high-modulus fibers and their composites.
Terminologycomposites, as C274 defineswell as 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
...