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ASTM D6790-02

(Test Method)

Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores

Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores

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.
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.

General Information

Status
Historical
Publication Date
09-Apr-2002
ICS
49.025.99 - Other materials
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.09 - Sandwich Construction
Current Stage
Ref Project

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Replaced By
ASTM D6790-02(2007) - Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
Effective Date
01-May-2007

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ASTM D6790-02 - Standard Test Method for Determining Poisson's Ratio of Honeycomb CoresASTM D6790-02 - Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
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ASTM D6790-02 - Standard Test Method for Determining Poisson's Ratio of Honeycomb Cores
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Standard Test Method for
Determining Poisson’s Ratio of Honeycomb Cores
This standard is issued under the fixed designation D 6790; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the determination of the hon-
eycomb Poisson’s ratio from the anticlastic curvature radii, see
Fig. 1.
1.2 The values stated in SI units are to be regarded as the
standard. The inch-pound units given may be approximate.
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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
C 271 Test Method for Density of Sandwich Core Materi-
als
FIG. 1 Anticlastic Curvature
C 274 Terminology of Structural Sandwich Constructions
3. Terminology
5. Significance and Use
3.1 Definitions—Terminology C 274 defines terms relating
5.1 Certain sandwich panel finite element programs require
to sandwich constructions.
the Poisson’s ratio of the honeycomb core. It is not possible to
3.2 Symbols:
measurethehoneycomb’sPoisson’sratiobystandardmethods.
c = chord measurement
6. Interference
d = depth measurement
R = anticlastic curvature radius
6.1 The test method shown here is one means of obtaining
a
R = cylinder radius
the Poisson’s ratio of honeycomb. However, this test method
c
µ = Poisson’s ratio
has not been widely used, and it is in its conceptual stage.
4. Summary of Test Method
7. Apparatus
4.1 The Poisson’s ratio of honeycomb core is determined by
7.1 Cylinders, of various diameters. A 610 mm (24 in.)
bending the core around a cylinder and taking measurements of
diameter cylinder is recommended.
the anticlastic curvature that occurs.
7.2 Scale, capable of measuring accurately to 0.25 mm
(0.01 in.).
8. Sampling and Test Specimens
This test method is under the jurisdiction of ASTM Committee D30 on
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
8.1 Test at least five specimens per test condition unless
Sandwich Construction.
valid results can be gained through the use of fewer specimens,
Current edition approved Apr.10, 2002. Published June 2002.
Annual Book of ASTM Standards, Vol 15.03. such as in the case of a designed experiment.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6790
8.2 The test specimen shall be square. The length and width 12.2 Calculate the anticlastic curvature radius and Poisson’s
should be great enough to obtain an anticlastic curvature when ratio of the specimens as follows:
the specimen is bent over the cylinder.Aspecimen size of 300
2 2
4 d 1 c R
c
by 300 mm (12 by 12 in.) is recommended. R 5 µ 5
a
8 d R
a
8.3 Various core thicknesses should be tested. A core
thickness of 12.7 mm (0.50
...

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