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ASTM D6790-02(2007)

(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
Certain sandwich panel finite element programs require the Poisson’ratio of the honeycomb core. It is not possible to measure the honeycomb’Poisson’ratio by standard methods.
SCOPE
1.1 This test method covers the determination of the honeycomb Poisson's ratio from the anticlastic curvature radii, see .
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given may be approximate.
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
30-Apr-2007
ICS
49.025.99 - Other materials
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.09 - Sandwich Construction
Current Stage
Ref Project

Relations

Replaces
ASTM D6790-02 - Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
Effective Date
01-May-2007
Replaced By
ASTM D6790/D6790M-14 - Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
Effective Date
01-May-2014

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ASTM D6790-02(2007) - Standard Test Method for Determining Poisson's Ratio of Honeycomb CoresASTM D6790-02(2007) - Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
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ASTM D6790-02(2007) - Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6790 − 02 (Reapproved2007)
Standard Test Method for
1
Determining Poisson’s Ratio of Honeycomb Cores
This standard is issued under the fixed designation D6790; 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 5. Significance and Use
1.1 This test method covers the determination of the hon- 5.1 Certain sandwich panel finite element programs require
eycomb Poisson’s ratio from the anticlastic curvature radii, see the Poisson’s ratio of the honeycomb core. It is not possible to
Fig. 1. measurethehoneycomb’sPoisson’sratiobystandardmethods.
1.2 The values stated in SI units are to be regarded as the
6. Interference
standard. The inch-pound units given may be approximate.
6.1 The test method shown here is one means of obtaining
1.3 This standard does not purport to address all of the
the Poisson’s ratio of honeycomb. However, this test method
safety concerns, if any, associated with its use. It is the
has not been widely used, and it is in its conceptual stage.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
7. Apparatus
bility of regulatory limitations prior to use.
7.1 Cylinders, of various diameters. A610 mm (24 in.)
2. Referenced Documents
diameter cylinder is recommended.
2
2.1 ASTM Standards:
7.2 Scale, capable of measuring accurately to 0.25 mm
C271/C271M Test Method for Density of Sandwich Core
(0.01 in.).
Materials
C274 Terminology of Structural Sandwich Constructions
8. Sampling and Test Specimens
8.1 Test at least five specimens per test condition unless
3. Terminology
valid results can be gained through the use of fewer specimens,
3.1 Definitions—Terminology C274 defines terms relating
such as in the case of a designed experiment.
to sandwich constructions.
8.2 The test specimen shall be square. The length and width
3.2 Symbols:
should be great enough to obtain an anticlastic curvature when
c = chord measurement
the specimen is bent over the cylinder.Aspecimen size of 300
d = depth measurement
by 300 mm (12 by 12 in.) is recommended.
R = anticlastic curvature radius
a
8.3 Various core thicknesses should be tested. A core
R = cylinder radius
c
thickness of 12.7 mm (0.50 in.) is recommended as a starting
µ = Poisson’s ratio
thickness.
4. Summary of Test Method
9. Calibration
4.1 The Poisson’s ratio of honeycomb core is determined by
9.1 The accuracy of all measuring equipment shall have
bendingthecorearoundacylinderandtakingmeasurementsof
certified calibrations that are current at the time of use of the
the anticlastic curvature that occurs.
equipment.
10. Conditioning
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
10.1 When the physical properties of the core material are
Sandwich Construction.
affected by moisture, bring the test specimens to constant
Current edition approved May 1, 2007. Published June 2007. Originally
weight (61 %) before testing, preferably in a conditioning
approved in 2002. Last previous edition approved in 2002 as D6790 - 02. DOI:
10.1520/D6790-02R07.
room with temperature and humidity control and make the
2
For referenced ASTM standards, visit the ASTM website, w
...

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