ASTM D6772-02(2007)

Standard Test Method for Dimensional Stability of Sandwich Core Materials

SIGNIFICANCE AND USE
Sandwich panel cores may change plan dimensions when heated. It is prudent to know if this may be a problem with the final part dimensions.
SCOPE
1.1 This test method covers the determination of the sandwich core dimensional stability in the two plan dimensions.
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: 83.120 - Reinforced plastics
• Technical Committee: D30 - Composite Materials
• Drafting Committee: D30.09 - Sandwich Construction

Relations

• Replaces: ASTM D6772-02 - Standard Test Method for Dimensional Stability of Sandwich Core Materials
• Effective Date: 01-May-2007
• Replaced By: ASTM D6772/D6772M-15 - Standard Test Method for Dimensional Stability of Sandwich Core Materials
• Effective Date: 01-Apr-2015

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6772 − 02 (Reapproved2007)
Standard Test Method for
1
Dimensional Stability of Sandwich Core Materials
This standard is issued under the fixed designation D6772; 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 6. Interferences
1.1 This test method covers the determination of the sand- 6.1 If oven size is limited, smaller specimens may be used.
wich core dimensional stability in the two plan dimensions.
6.2 If the specimen warps, flatten it out while making the
1.2 The values stated in SI units are to be regarded as the measurements.
standard. The inch-pound units given may be approximate.
7. Apparatus
1.3 This standard does not purport to address all of the
7.1 Oven, capable of maintaining a controlled temperature
safety concerns, if any, associated with its use. It is the
63°C (65°F).
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
7.2 Scale, capable of measuring accurately to 0.25 mm
bility of regulatory limitations prior to use.
(0.01 in.).
7.3 Micrometer, capable of measuring accurately to 0.025
2. Referenced Documents
mm (0.001 in.).
2.1 ASTM Standards:
8. Sampling and Test Specimens
C271/C271M Test Method for Density of Sandwich Core
Materials
8.1 Test at least five specimens per test condition unless
C274 Terminology of Structural Sandwich Constructions
valid results can be gained through the use of fewer specimens,
such as in the case of a designed experiment.
3. Terminology
8.2 The test specimens, if possible, should be approximately
3.1 Definitions—Terminology C274 defines terms relating
460 by 915 mm (18 by 36 in.) in plan dimension, and the
to sandwich constructions.
thickness shall be approximately 12.7 mm (0.50 in.). For
honeycomb cores, the 460-mm (18-in.) dimension is the core’s
3.2 Symbols:
ribbon or L direction. Other dimensions can be used, but must
L = initial measured dimension
i
be reported.
L = final measured dimension
f
9. Calibration
4. Summary of Test Method
9.1 The accuracy of all measuring equipment shall have
4.1 A small piece of honeycomb is placed in an elevated
certified calibrations that are current at the time of use of the
temperature environment and after cooling, the dimensional
equipment.
changes in the plan dimensions are measured and compared to
the initial measurements. A typical honeycomb specimen is
10. Conditioning
shown in Fig. 1.
10.1 When the physical properties of the material are
affected by moisture, bring the test specimens to constant
5. Significance and Use
weight (61 %) before testing. A temperature of 23 6 3°C (73
5.1 Sandwich panel cores may change plan dimensions
6 5°F) and a relative humidity of 50 6 5 % are recommended.
when heated. It is prudent to know if this may be a problem
11. Procedure
with the final part dimensions.
11.1 Weigh the specimens in grams (pounds) to a precision
of 60.5 %.
1
This test method is under the jurisdiction of ASTM Committee D30 on
11.2 Determine the plan dimensions of the specimens in
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction. millimetres (inches) to a precision of 60.5 %.
Current edition approved May 1, 2007. P
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