ASTM D6790/D6790M-14
(Test Method)Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
SIGNIFICANCE AND USE
5.1 Certain sandwich panel analyses require the Poisson's ratio of the honeycomb core. It is not possible to measure the honeycomb's Poisson's ratio by standard methods.
5.2 This test method provides a standard method of determining the Poisson’s ratio of honeycomb core materials for design properties, material specifications, research and development applications, and quality assurance.
5.3 Factors that influence the Poisson’s ratio of honeycomb core materials and shall therefore be reported, include the following: core material, methods of material fabrication, core geometry, core thickness, core thickness uniformity, cell wall thickness, specimen geometry, specimen preparation and specimen conditioning.
SCOPE
1.1 This test method covers the determination of the sandwich honeycomb core Poisson's ratio from the anticlastic curvature radii, see Fig. 1.
1.2 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.
1.2.1 Within the text, the inch-pound units are shown in brackets.
1.3 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: D6790/D6790M − 14
StandardTest Method for
1
Determining Poisson’s Ratio of Honeycomb Cores
This standard is issued under the fixed designation D6790/D6790M; 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 E456 Terminology Relating to Quality and Statistics
E1309 Guide for Identification of Fiber-Reinforced
1.1 This test method covers the determination of the sand-
Polymer-Matrix Composite Materials in Databases
wich honeycomb core Poisson’s ratio from the anticlastic
E1434 Guide for Recording Mechanical Test Data of Fiber-
curvature radii, see Fig. 1.
Reinforced Composite Materials in Databases
1.2 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
3. Terminology
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. Terminology
values from the two systems may result in non-conformance
C274 defines terms relating to structural sandwich construc-
with the standard.
tions. Terminology D883 defines terms relating to plastics.
1.2.1 Within the text, the inch-pound units are shown in
Terminology E456 and Practice E177 define terms relating to
brackets.
statistics.Intheeventofaconflictbetweenterms,Terminology
1.3 This standard does not purport to address all of the
D3878 shall have precedence over the other terminologies.
safety concerns, if any, associated with its use. It is the
3.2 Symbols:
responsibility of the user of this standard to establish appro-
c = chord measurement
priate safety and health practices and determine the applica-
CV = coefficient of variation statistic of a sample population
bility of regulatory limitations prior to use.
for a given property (in percent)
d = depth measurement
2. Referenced Documents
R = anticlastic curvature radius
a
2
2.1 ASTM Standards:
R = cylinder radius
c
C271/C271M Test Method for Density of Sandwich Core
S = standard deviation statistic of a sample population for
n-1
Materials
a given property
C274 Terminology of Structural Sandwich Constructions
x = test result for an individual specimen from the sample
1
D883 Terminology Relating to Plastics
population for a given property
D3878 Terminology for Composite Materials
x¯ = mean or average (estimate of mean) of a sample popu-
D5229/D5229M TestMethodforMoistureAbsorptionProp-
lation for a given property
erties and Equilibrium Conditioning of Polymer Matrix
v = Poisson’s ratio
Composite Materials
E122 Practice for Calculating Sample Size to Estimate,With
4. Summary of Test Method
Specified Precision, the Average for a Characteristic of a
4.1 This test method determines the Poisson’s ratio of
Lot or Process
sandwich honeycomb core by bending the core around a
E177 Practice for Use of the Terms Precision and Bias in
cylinder and taking measurements of the anticlastic curvature
ASTM Test Methods
that occurs.
5. Significance and Use
1
This test method is under the jurisdiction of ASTM Committee D30 on
5.1 Certain sandwich panel analyses require the Poisson’s
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
ratio of the honeycomb core. It is not possible to measure the
Current edition approved May 1, 2014. Published June 2014. Originally
honeycomb’s Poisson’s ratio by conventional methods.
approved in 2002. Last previous edition approved in 2007 as D6790 - 02(2007).
DOI: 10.1520/D6790_D6790M-14.
5.2 This test method provides a standard method of deter-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
mining the Poisson’s ratio of honeycomb core materials for
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
design properties, material specifications, research and devel-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. opment applications, and quality assurance.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D6790/D6790M − 14
6.6 Measurement Devices—Measurements for anticlastic
curvature depth described in 11.6 may be affected by the width
of the scale described in 7.3 where it contacts the specimen.
7. Apparatus
7.1 Micrometers and Calipers—-Amicrometerhavingaflat
anvil interface, or a caliper of suitable size, shall be used. The
accuracy of the instrument(s) shall be suitable for reading to
within 0.
...
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: D6790 − 02 (Reapproved 2007) D6790/D6790M − 14
Standard Test Method for
1
Determining Poisson’s Ratio of Honeycomb Cores
This standard is issued under the fixed designation D6790;D6790/D6790M; 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 the sandwich honeycomb core Poisson’s ratio from the anticlastic curvature
radii, see Fig. 1.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as the standard. The inch-pound units
given may be approximate.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.
1.2.1 Within the text, the inch-pound units are shown in brackets.
1.3 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 Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite
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
3. Terminology
3.1 Definitions—Terminology D3878 defines terms relating to high-modulus fibers and their composites. Terminology C274
defines terms relating to structural sandwich constructions. Terminology D883 defines terms relating to plastics. 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.
3.2 Symbols:
c = chord measurement
CV = coefficient of variation statistic of a sample population for a given property (in percent)
d = depth measurement
R = anticlastic curvature radius
a
R = cylinder radius
c
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, 2007May 1, 2014. Published June 2007June 2014. Originally approved in 2002. Last previous edition approved in 20022007 as
D6790 - 02.D6790 - 02(2007). DOI: 10.1520/D6790-02R07.10.1520/D6790_D6790M-14.
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
---------------------- Page: 1 ----------------------
D6790/D6790M − 14
FIG. 1 Anticlastic Curvature
S = standard deviation statistic of a sample population for a given property
n-1
x = test result for an individual specimen from the sample population for a given property
1
x¯ = mean or average (estimate of mean) of a sample population for a given property
μ = Poisson’sv = Poisson’s ratio
4. Summary of Test Method
4.1 The This test method determines the Poisson’s ratio of sandwich honeycomb core is determined by bending the core around
a cylinder and taking measurements of the anticlastic curvature that occurs.
5. Significance and Use
5.1 Certain sandwich panel finite element programs analyses require the Poisson’s ratio of the honeycomb core. It is not possible
to measure the honeycomb’s Poisson’s ratio by standardconventional methods.
5.2 This test method provides a standard method of determining the Poisson’s ratio of honeycomb c
...
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