ASTM C271/C271M-05
(Test Method)Standard Test Method for Density of Sandwich Core Materials
Standard Test Method for Density of Sandwich Core Materials
SIGNIFICANCE AND USE
Density is a fundamental physical property that can be used in conjunction with other properties to characterize the sandwich core. Most sandwich core structural properties, such as strength and stiffness, are proportional to the density.
This test method provides a standard method of obtaining sandwich core density data for design properties, material specifications, research and development applications, and quality assurance.
Factors that influence the density and shall therefore be reported include the following: core material, methods of material fabrication, core geometry (nominal cell size), specimen geometry, specimen preparation, methods of weight and dimensional measurement, specimen conditioning, and moisture content during weight and dimensional measurements.
SCOPE
1.1 This test method covers the determination of the density of sandwich construction core materials. Permissible core material forms include those with continuous bonding surfaces (such as balsa wood and foams) as well as those with discontinuous bonding surfaces (such as honeycomb).
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
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
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Standards Content (Sample)
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Designation: C271/C271M – 05
Standard Test Method for
1
Density of Sandwich Core Materials
This standard is issued under the fixed designation C271/C271M; 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 Testing Flexible Barrier Materials
E177 Practice for Use of the Terms Precision and Bias in
1.1 This test method covers the determination of the density
ASTM Test Methods
of sandwich construction core materials. Permissible core
E456 Terminology Relating to Quality and Statistics
material forms include those with continuous bonding surfaces
E1309 Guide for Identification of Fiber-Reinforced
(such as balsa wood and foams) as well as those with
Polymer-Matrix Composite Materials in Databases
discontinuous bonding surfaces (such as honeycomb).
E1434 Guide for Recording Mechanical Test Data of Fiber-
1.2 The values stated in either SI units or inch-pound units
Reinforced Composite Materials in Databases
are to be regarded separately as standard. Within the text the
E1471 Guide for Identification of Fibers, Fillers, and Core
inch-pound units are shown in brackets. The values stated in
Materials in Computerized Material Property Databases
each system are not exact equivalents; therefore, each system
must be used independently of the other. Combining values
3. Terminology
from the two systems may result in nonconformance with the
3.1 Definitions—Terminology D3878 defines terms relating
standard.
to high-modulus fibers and their composites. Terminology
1.3 This standard does not purport to address all of the
C274 defines terms relating to structural sandwich construc-
safety concerns, if any, associated with its use. It is the
tions. Terminology D883 defines terms relating to plastics.
responsibility of the user of this standard to establish appro-
Terminology E456 and Practice E177 define terms relating to
priate safety and health practices and determine the applica-
statistics.Intheeventofaconflictbetweenterms,Terminology
bility of regulatory limitations prior to use.
D3878 shall have precedence over the other terminologies.
2. Referenced Documents 3.2 Symbols:
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CV = coefficient of variation statistic of a sample population
2.1 ASTM Standards:
for a given property (in percent)
C274 Terminology of Structural Sandwich Constructions
d = density of a test specimen in inch-pound units
IP
D883 Terminology Relating to Plastics
d = density of a test specimen in SI units
D3878 Terminology for Composite Materials SI
l = length of a test specimen
D5229/D5229M Test Method for Moisture Absorption
S = standard deviation statistic of a sample population for
Properties and Equilibrium Conditioning of Polymer Ma- n–1
a given property
trix Composite Materials
t = thickness of a test specimen
E122 Practice for Calculating Sample Size to Estimate,
x = test result for an individual specimen from the sample
i
With Specified Precision, the Average for a Characteristic
population for a given property
of a Lot or Process
–
E171 Specification for Atmospheres for Conditioning and x = mean or average (estimate of mean) of a sample popu-
lation for a given property
w = width of a test specimen
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This test method is under the jurisdiction of ASTM Committee D30 on
W = mass of a test specimen
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
4. Summary of Test Method
Current edition approved April 1, 2005. Published April 2005. Originally
4.1 This test method consists of environmentally condition-
approved in 1951. Last previous edition approved in 1999 as C271 – 99. DOI:
10.1520/C0271_C0271M-05.
ing a sandwich core specimen, weighing the specimen, mea-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
suring the length, width and thickness of the specimen, and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
calculating the density.
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.
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C271/C271M – 05
5. Significance and Use specimens, as in the case of a designed experiment. For
statistically significant data, consult the procedures outlined in
5.1 Density is a fundamental physical property that can be
Practice E122. Report the method of sampling.
used in conjunction with other properties to characterize the
8.2 Geometry—Test specimens shall have a square or rect-
sandwich core. Most sandwich core structural properties, s
...
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