ASTM F1645/F1645M-12
(Test Method)Standard Test Method for Water Migration in Honeycomb Core Materials
Standard Test Method for Water Migration in Honeycomb Core Materials
SIGNIFICANCE AND USE
Water permeability is a fundamental physical property that can be used in conjunction with other properties to characterize honeycomb sandwich core materials. Migration testing can be used to characterize and compare the relative permeability of honeycomb core materials to water.
This test method provides a standard method of characterizing the rate of water migration within honeycomb sandwich core materials for design properties, material specifications, research and development applications, and quality assurance.
Factors that influence water migration rate characteristics of honeycomb sandwich core materials and shall therefore be reported include the following: core material, methods of material fabrication, core geometry (cell size), core thickness, core thickness uniformity, cell wall thickness, specimen geometry, specimen preparation, specimen conditioning, facing material, facing permeability, adhesive permeability, adhesive thickness, and methods of mass, volume, and water column height measurement.
SCOPE
1.1 This test method covers the determination of water migration in honeycomb core materials.
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.
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Designation: F1645/F1645M − 12
StandardTest Method for
1
Water Migration in Honeycomb Core Materials
ThisstandardisissuedunderthefixeddesignationF1645/F1645M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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 water
E1434 Guide for Recording Mechanical Test Data of Fiber-
migration in honeycomb core materials.
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.
1.2.1 Within the text the inch-pound units are shown in tions. Terminology D883 defines terms relating to plastics.
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
responsibility of the user of this standard to establish appro-
3.2 Symbols:
priate safety and health practices and determine the applica-
CV = coefficient of variation statistic of a sample population
bility of regulatory limitations prior to use.
for a given property (in percent)
S = standard deviation statistic of a sample population for
n-1
2. Referenced Documents
a given property
2
2.1 ASTM Standards:
x = test result for an individual specimen from the sample
1
C271/C271M Test Method for Density of Sandwich Core
population for a given property
Materials
x¯5 mean or average (estimate of mean) of a sample
C274 Terminology of Structural Sandwich Constructions
population for a given property
D883 Terminology Relating to Plastics
V = volume of water necessary to fill one core cell
D3878 Terminology for Composite Materials c
D5229/D5229M TestMethodforMoistureAbsorptionProp- V = volume of water transfused
f
erties and Equilibrium Conditioning of Polymer Matrix
W = mass of specimen after filling the primary cell with
c
Composite Materials
water
E122 Practice for Calculating Sample Size to Estimate,With
W = mass of specimen after water transfusion
f
Specified Precision, the Average for a Characteristic of a
W = mass of specimen after conditioning, prior to water
i
Lot or Process
introduction
E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
4. Summary of Test Method
E456 Terminology Relating to Quality and Statistics
4.1 This test method consists of bonding a honeycomb core
materialtotransparentfacingsusingawater-resistantadhesive,
1
This test method is under the jurisdiction of ASTM Committee D30 on
drilling an access hole through one facing to an individual core
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
cell, filling the cell with water, subjecting the filled cell to a
Sandwich Construction.
constant hydrostatic pressure by maintaining a specified water
Current edition approved April 1, 2012. Published May 2012. Originally
column height, then measuring the amount of water transferred
approved in 1995. Last previous edition approved in 2007 as F1645 – 07. DOI:
10.1520/F1645_F1645M-12.
into the honeycomb core specimen (primarily due to diffusion
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
through the cell walls) within a 24-h period. The amount of
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
water transferred is presented as an approximate number of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. honeycomb core cells filled with water.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F1645/F1645M − 12
5. Significance and Use measurement, whereas an instrument with an accuracy of
6250 µm [60.010 in.] is acceptable for length and width
5.1 Water permeability is a fundamental physical property
measurement.
that can be used in conjunction with other properties to
7.2 Balance or Weighing Scale—If the amount of water
characterize h
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:F1645/F1645M–07 Designation:F1645/F1645M–12
Standard Test Method for
1
Water Migration in Honeycomb Core Materials
ThisstandardisissuedunderthefixeddesignationF1645/F1645M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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 water migration in honeycomb core materials.
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 aremay not be exact equivalents; therefore, each system
mustshall 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 MoistureAbsorption 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
definestermsrelatingtostructuralsandwichconstructions.TerminologyD883definestermsrelatingtoplastics.TerminologyE456
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:
CV = coefficient of variation statistic of a sample population for a given property (in percent)
S = standard deviation statistic of a sample population for a given property
n-1
x = test result for an individual specimen from the sample population for a given property
1
x = mean or average (estimate of mean) of a sample population for a given property
V = volume of water necessary to fill one core cell
c
V = volume of water transfused
f
W = mass of specimen after filling the primary cell with water
c
W = mass of specimen after water transfusion
f
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 MayApril 1, 2007.2012. Published June 2007.May 2012. Originally approved in 1995. Last previous edition approved in 20052007 as
F1645–00(2005).F1645 – 07. DOI: 10.1520/F1645_F1645M-0712.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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 ----------------------
F1645/F1645M–12
W = mass of specimen after conditioning, prior to water introduction
i
4. Summary of Test Method
4.1 This test method consists of bonding a honeycomb core material to transparent facings using a water-resistant adhesive,
drillinganaccessholethroughonefacingtoanindividualcorecell,fillingthecellwithwater,subjectingthefilledcelltoaconstant
hydrostatic pressure by maintaining a specified water column height, then measuring the amount of water transferred into the
honeycombcorespecimen(primarilyduetodiffusionthroughthecellwalls)withina24-hperiod.Theamountofwatertransferred
is presented as an approximate number of honeycom
...
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