ASTM D6772/D6772M-15
(Test Method)Standard Test Method for Dimensional Stability of Sandwich Core Materials
Standard Test Method for Dimensional Stability of Sandwich Core Materials
SIGNIFICANCE AND USE
5.1 Sandwich panel cores may change planar dimensions when heated. This phenomenon can be associated with the effects of heating upon the core material itself, as well as changes in core moisture content resulting from the heating cycle. It is prudent to know if this may be problematic with regard to the intended final part dimensions.
5.2 This test method provides a standard method of characterizing the dimensional stability of sandwich core materials for design properties, material specifications, research and development applications, and quality assurance.
5.3 Factors that influence dimensional stability of sandwich 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, heating and cooling environments (including temperatures and humidity levels), and specimen conditioning (both prior to and after heating).
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 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.
General Information
Relations
Buy Standard
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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/D6772M − 15
StandardTest Method for
1
Dimensional Stability of Sandwich Core Materials
This standard is issued under the fixed designation D6772/D6772M; 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 E1309 Guide for Identification of Fiber-Reinforced
Polymer-Matrix Composite Materials in Databases
1.1 This test method covers the determination of the sand-
E1434 Guide for Recording Mechanical Test Data of Fiber-
wich core dimensional stability in the two plan dimensions.
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-
3.2.1 CV—coefficient of variation statistic of a sample
priate safety and health practices and determine the applica-
population for a given property (in percent)
bility of regulatory limitations prior to use.
3.2.2 L— initial (pre-test) measured dimension
i
2. Referenced Documents
3.2.3 L—post-heating measured dimension
f
2
2.1 ASTM Standards:
3.2.4 S —standard deviation statistic of a sample popula-
n-1
C271/C271M Test Method for Density of Sandwich Core
tion for a given property
Materials
3.2.5 x —test result for an individual specimen from the
C274 Terminology of Structural Sandwich Constructions
I
sample population for a given property
D883 Terminology Relating to Plastics
D3878 Terminology for Composite Materials
3.2.6 x¯—mean or average (estimate of mean) of a sample
D5229/D5229M Test Method for MoistureAbsorption Prop-
population for a given property
erties and Equilibrium Conditioning of Polymer Matrix
Composite Materials
4. Summary of Test Method
E122 Practice for Calculating Sample Size to Estimate,With
4.1 This test method consists of placing a small piece of
Specified Precision, the Average for a Characteristic of a
sandwichcorematerialinanelevatedtemperatureenvironment
Lot or Process
for a specified period of time. After cooling, the dimensional
E177 Practice for Use of the Terms Precision and Bias in
changes in the planar dimensions are measured and compared
ASTM Test Methods
to the initial measurements taken prior to thermal exposure,
E456 Terminology Relating to Quality and Statistics
both immediately after heating and after re-conditioning. A
typical honeycomb core specimen is shown in Fig. 1.
1
This test method is under the jurisdiction of ASTM Committee D30 on
5. Significance and Use
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
5.1 Sandwich panel cores may change planar dimensions
Current edition approved April 1, 2015. Published April 2015. Originally
when heated. This phenomenon can be associated with the
approved in 2002. Last previous edition approved in 2007 as D6772 - 02(2007).
DOI: 10.1520/D6772_D6772M-15.
effects of heating upon the core material itself, as well as
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
changes in core moisture content resulting from the heating
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cycle. It is prudent to know if this may be problematic with
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. regard to the intended final part dimensions.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6772/D6772M − 15
measurement, whereas an instrument with an accuracy of
60.25 mm [60.01 in.] is desirable for length and width
measurement.
7.2 Balance or Weighing Scale—An analytical balance or
weighing scale is required that is capable of measuring the
mass of th
...
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: D6772 − 02 (Reapproved 2007) D6772/D6772M − 15
Standard Test Method for
1
Dimensional Stability of Sandwich Core Materials
This standard is issued under the fixed designation D6772;D6772/D6772M; 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 core dimensional stability in the two plan dimensions.
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:
L = initial measured dimension
i
L = final measured dimension
f
3.2 Symbols:
3.2.1 CV—coefficient of variation statistic of a sample population for a given property (in percent)
3.2.2 L — initial (pre-test) measured dimension
i
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, 2007April 1, 2015. Published June 2007April 2014. Originally approved in 2002. Last previous edition approved in 20022007 as
D6772 - 02.D6772 - 02(2007). DOI: 10.1520/D6772-02R07.10.1520/D6772_D6772M-15.
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 ----------------------
D6772/D6772M − 15
3.2.3 L —post-heating measured dimension
f
3.2.4 S —standard deviation statistic of a sample population for a given property
n-1
3.2.5 x —test result for an individual specimen from the sample population for a given property
I
3.2.6 x¯—mean or average (estimate of mean) of a sample population for a given property
4. Summary of Test Method
4.1 A This test method consists of placing a small piece of honeycomb is placedsandwich core material in an elevated
temperature environment and after for a specified period of time. After cooling, the dimensional changes in the planplanar
dimensions are measured and compared to the initial measurements. measurements taken prior to thermal exposure, both
immediately after heating and after re-conditioning. A typical honeycomb core specimen is shown in Fig. 1.
FIG. 1 Dimensional Stability Specimen
5. Significance and Use
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.