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ASTM C366/C366M-05

(Test Method)

Standard Test Methods for Measurement of Thickness of Sandwich Cores

Standard Test Methods for Measurement of Thickness of Sandwich Cores

SIGNIFICANCE AND USE
Normally, a close tolerance is desirable for core thickness so that sandwich panels may be manufactured with all the sandwich components fitting properly and without crushing the core.
These test methods are designed for measuring thickness of core as it is produced and are not intended for use in determining dimensions of core specimens for other tests.
These test methods provide standard methods of obtaining the core thickness of flat sandwich core materials, and provide a basis for determining average thickness dimensions. The thickness properties derived may be used in design properties, material specifications, research and development applications, and quality assurance.
Factors that influence core thickness measurement and shall therefore be reported include the following: core material through-thickness rigidity, surface roughness, specimen geometry (including warpage), specimen preparation, methods of dimensional measurement, specimen conditioning, and moisture content during dimensional measurements.
SCOPE
1.1 These test methods cover plant manufacturing procedures for measuring the thickness of flat sandwich cores. 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). The two test methods covered include the following:
1.1.1 Test Method ARoller-Type Thickness Tester.
1.1.2 Test Method BDisk-Type Thickness Tester.Note 1
These test methods are designed for measuring thickness of core as it is produced and are not intended for use in determining dimensions of core specimens for other tests.
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

Status
Historical
Publication Date
31-Mar-2005
ICS
83.120 - Reinforced plastics
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.09 - Sandwich Construction
Current Stage
Ref Project

Relations

Replaces
ASTM C366-99 - Standard Test Methods for Measurement of Thickness of Sandwich Cores
Effective Date
01-Apr-2005
Replaced By
ASTM C366/C366M-11 - Standard Test Methods for Measurement of Thickness of Sandwich Cores
Effective Date
01-Apr-2011
Referred By
ASTM E1730-19 - Standard Specification for Rigid Foam for Use in Structural Sandwich Panel Cores
Effective Date
01-Apr-2005
Referred By
ASTM D4762-18 - Standard Guide for Testing Polymer Matrix Composite Materials
Effective Date
01-Apr-2005
Referred By
ASTM E1091-21 - Standard Specification for Nonmetallic Honeycomb Core for Use in Shelter Panels
Effective Date
01-Apr-2005

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ASTM C366/C366M-05 - Standard Test Methods for Measurement of Thickness of Sandwich CoresASTM C366/C366M-05 - Standard Test Methods for Measurement of Thickness of Sandwich Cores
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ASTM C366/C366M-05 - Standard Test Methods for Measurement of Thickness of Sandwich 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: C366/C366M – 05
Standard Test Methods for
1
Measurement of Thickness of Sandwich Cores
This standard is issued under the fixed designation C366/C366M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D5229/D5229M Test Method for Moisture Absorption
Properties and Equilibrium Conditioning of Polymer Ma-
1.1 These test methods cover plant manufacturing proce-
trix Composite Materials
dures for measuring the thickness of flat sandwich cores.
E122 Practice for Calculating Sample Size to Estimate,
Permissible core material forms include those with continuous
With Specified Precision, the Average for a Characteristic
bonding surfaces (such as balsa wood and foams) as well as
of a Lot or Process
those with discontinuous bonding surfaces (such as honey-
E171 Specification for Atmospheres for Conditioning and
comb). The two test methods covered include the following:
Testing Flexible Barrier Materials
1.1.1 Test Method A—Roller-Type Thickness Tester.
E177 Practice for Use of the Terms Precision and Bias in
1.1.2 Test Method B—Disk-Type Thickness Tester.
ASTM Test Methods
NOTE 1—These test methods are designed for measuring thickness of
E456 Terminology Relating to Quality and Statistics
core as it is produced and are not intended for use in determining
E1309 Guide for Identification of Fiber-Reinforced
dimensions of core specimens for other tests.
Polymer-Matrix Composite Materials in Databases
1.2 The values stated in either SI units or inch-pound units
E1434 Guide for Recording Mechanical Test Data of Fiber-
are to be regarded separately as standard. Within the text the
Reinforced Composite Materials in Databases
inch-pound units are shown in brackets. The values stated in
E1471 Guide for Identification of Fibers, Fillers, and Core
each system are not exact equivalents; therefore, each system
Materials in Computerized Material Property Databases
must be used independently of the other. Combining values
3. Terminology
from the two systems may result in nonconformance with the
standard.
3.1 Definitions—Terminology D3878 defines terms relating
1.3 This standard does not purport to address all of the
to high-modulus fibers and their composites. Terminology
safety concerns, if any, associated with its use. It is the
C274 defines terms relating to structural sandwich construc-
responsibility of the user of this standard to establish appro-
tions. Terminology D883 defines terms relating to plastics.
priate safety and health practices and determine the applica-
Terminology E456 and Practice E177 define terms relating to
bility of regulatory limitations prior to use.
statistics.Intheeventofaconflictbetweenterms,Terminology
D3878 shall have precedence over the other terminologies.
2. Referenced Documents
3.2 Symbols:
2
2.1 ASTM Standards:
CV = coefficient of variation statistic of a sample population
C274 Terminology of Structural Sandwich Constructions
for a given property (in percent)
D883 Terminology Relating to Plastics
S = standard deviation statistic of a sample population for
n-1
D3878 Terminology for Composite Materials
a given property
X = test result for an individual specimen from the sample
i
population for a given property
–
1
These test methods are under the jurisdiction of ASTM Committee D30 on
x = mean or average (estimate of mean) of a sample popu-
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
lation for a given property
Sandwich Construction.
Current edition approved April 1, 2005. Published April 2005. Originally
4. Summary of Test Methods
approved in 1955. Last previous edition approved in 1999 as C366 – 99. DOI:
10.1520/C0366_C0366M-05.
4.1 These test methods consist of environmentally condi-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tioning a sandwich core specimen, zeroing a thickness tester,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
placing the core underneath the tester, and measuring the core
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. thickness by sliding the core underneath the tester. Procedures
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C366/C366M – 05
are provided for thickness measurement using both roller-type
and disk-type thickness testers.
5. Significance and Use
5.1 Normally, a close tolerance is desirable for
...

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1.1 This test method covers the bearing response of pinned or fastened joints using multi-directional polymer matrix composite laminates reinforced by high-modulus fibers by double-shear tensile loading (Procedure A), single-shear tensile or compressive loading of a two-piece specimen (Procedure B), single-shear tensile loading of a one-piece specimen (Procedure C), or double-shear compressive loading (Procedure D). Standard specimen configurations using fixed values of test parameters are described for each procedure. However, when fully documented in the test report, a number of test parameters may be optionally varied. The composite material forms are limited to continuous-fiber or discontinuous-fiber (tape or fabric, or both) reinforced composites for which the laminate is balanced and symmetric with respect to the test direction. The range of acceptable test laminates and thicknesses are described in 8.2.1.  
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SCOPE
1.1 This practice provides instructions for modifying laminate quasi-static indentation and drop-weight impact test methods to determine damage resistance properties of sandwich constructions. 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, truss cores and fiber-reinforced cores).  
1.2 This practice supplements Test Methods D6264/D6264M (for quasi-static indentation testing) and D7136/D7136M (for drop-weight impact testing) with provisions for testing sandwich specimens. Several important test specimen parameters (for example, facing thickness, core thickness and core density) are not mandated by this practice; however, repeatable results require that these parameters be specified and reported.  
1.3 Three test procedures are provided. Procedures A and B correspond to D6264/D6264M test procedures for rigidlybacked and edge-supported test conditions, respectively. Procedure C corresponds to D7136/D7136M test procedures. All three procedures are suitable for imparting damage to a sandwich specimen in preparation for subsequent damage tolerance testing in accordance with Test Method D8287/D8287M (compressive loading) and Practice D8388/D8388M (flexural loading).  
1.4 In general, Procedure A is considered to be the most suitable procedure for comparative damage resistance assessments, due to reduced influence of flexural stiffness and support fixture characteristics upon damage formation. However, the selection of a test procedure and associated support conditions should be done in consideration of the intended structural application, and as such Procedures B and C may be more appropriate for comparative purposes for some applications.  
1.5 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not ...

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