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ASTM C272-01

(Test Method)

Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions

Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions

SCOPE
1.1 This test method covers the determination of the relative amount of water absorption by various types of structural core materials when immersed or in a high relative humidity environment. This test method is intended to apply to only structural core materials; honeycomb, foam, and balsa wood.
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
09-Sep-2001
ICS
83.120 - Reinforced plastics
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.09 - Sandwich Construction
Current Stage
Ref Project

Relations

Replaces
ASTM C272-91(1996) - Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions
Effective Date
10-Sep-2001
Replaced By
ASTM C272-01(2007) - Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions
Effective Date
01-Jan-2007
Referred By
ASTM C578-22 - Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation
Effective Date
10-Sep-2001

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ASTM C272-01 - Standard Test Method for Water Absorption of Core Materials for Structural Sandwich ConstructionsASTM C272-01 - Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions
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ASTM C272-01 - Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:C272–01
Standard Test Method for
Water Absorption of Core Materials for Structural Sandwich
1
Constructions
This standard is issued under the fixed designation C 272; 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 (e) 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 constant, loss tangent, and electrical resistance) and mechani-
cal properties (such as strength and modulus). The amount of
1.1 This test method covers the determination of the relative
weight the structure may gain by the core absorbing water is
amount of water absorption by various types of structural core
also important. It should be noted that in a sandwich panel
materials when immersed or in a high relative humidity
there are facings bonded on two sides of the core that affect the
environment. This test method is intended to apply to only
amount of water absorbed by the core.
structural core materials; honeycomb, foam, and balsa wood.
1.2 The values stated in SI units are to be regarded as the
6. Interferences
standard. The inch-pound units given may be approximate.
6.1 Material and Specimen Preparation—Cracks in the
1.3 This standard does not purport to address all of the
specimen and rough surfaces can increase the apparent water
safety concerns, if any, associated with its use. It is the
absorption.
responsibility of the user of this standard to establish appro-
6.2 Surface Water—Some core materials tend to collect
priate safety and health practices and determine the applica-
water on the surfaces or trap water in corners, and, if not
bility of regulatory limitations prior to use.
removed will give incorrect results.
2. Referenced Documents
7. Apparatus
2.1 ASTM Standards:
7.1 Analytical Balance, capable of measurement to 0.001 g.
C 271 Test Method for Density of Sandwich Core Materi-
2 7.2 Circulating Air Oven, capable of maintaining uniform
als
2 temperatures with an accuracy of 63°C (65°F).
C 274 Terminology of Structural Sandwich Constructions
3 7.3 Humidity Chamber, capable of maintaining uniform
D 1193 Specification for Reagent Water
relative humidity with an accuracy of 65 % and a uniform
3. Terminology temperature with an accuracy of 63°C (65°F).
7.4 The water used in this test method shall be distilled
3.1 Definitions—Terminology C 274 defines terms relating
water (Specification D 1193, Type IV reagent water) or deion-
to sandwich constructions.
ized water.
4. Summary of Test Method
8. Sampling and Test Specimens
4.1 A small piece of the core material is conditioned in
8.1 Test at least five specimens per test condition unless
various moisture conditions, and the amount of moisture
valid results can be gained through the use of fewer specimens,
absorbed is measured by the weight increase in the specimen.
such as in the case of a designed experiment.
5. Significance and Use
8.2 The test specimen shall be 75 by 75 by 12.7 mm (3 by
3by0.5in.)thick.Thethicknessofthespecimenshallbeinthe
5.1 The moisture content of most core materials is related to
same direction as the core thickness when used in a sandwich
such properties as electrical properties (such as dielectric
panel.
8.3 Machine, saw, or shear the test specimens from the core
1
This test method is under the jurisdiction of ASTM Committee D30 on
sample so as to have smooth surfaces that are free from cracks.
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
8.4 Measure the length and width dimensions to the nearest
Sandwich Construction.
0.25 mm (0.01 in.) and the thickness to the nearest 0.025 mm
Current edition approved Sept. 10, 2001. Published November 2001. Originally
(0.001 in.).
published as C 272 – 51 T. Last previous edition C 272 – 91 (1996).
2
Annual Book of ASTM Standards, Vol 15.03.
3
Annual Book of ASTM Standards, Vol 11.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C272
9. Calibration shake vigorously, allow the alcohol to evaporate, and immedi-
ately weigh and record the weight.
9.1 The accuracy of all measuring equipment shall have
11.3 Test Method C—Maximum Percent Weight Gain—
certified calibrations that are current at the time of use of the
Completely immerse the specimens in a container of water at
equipment.
a temperature of 23 6 3°C (73 6 5°F). Materials that float
10. Conditioning
should be held under water by a loose net. At the end of 48 h,
remove the specimens one at a time, shake vigorously, wipe off
10.1 Weigh the specimens individually
...

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5.1 Refer to Guide D8509.
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1.1 This test method determines the fastener pull-through resistance of multidirectional polymer matrix composites reinforced by high-modulus fibers. Fastener pull-through resistance is characterized by the force-versus-displacement response exhibited when a mechanical fastener is pulled through a composite plate, with the force applied perpendicular to the plane of the plate. The composite material forms are limited to continuous-fiber or discontinuous-fiber (tape or fabric, or both) reinforced composites for which the laminate is symmetric and balanced with respect to the test direction. The range of acceptable test laminates and thicknesses is defined in 8.2.  
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1.3 The specimens described herein may not be representative of actual joints which may contain one or more free edges adjacent to the fastener, or may contain multiple fasteners that can change the actual boundary conditions.  
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5.1 Refer to Guide D8509.
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1.1 This test method determines the open-hole tensile strength of multidirectional polymer matrix composite laminates reinforced by high-modulus fibers. The composite material forms are limited to continuous-fiber or discontinuous-fiber (tape or fabric, or both) reinforced composites in 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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5.2.1 To simulate the force-displacement relationships of impacts governed by boundary conditions (1-7).5 These are typically relatively large-mass low-velocity hard-body impacts on plates with a relatively small unsupported region. Since the test is run slowly in displacement control, the desired damage state can be obtained in a controlled manner. Associating specific damage events with a force during a drop-weight impact test is often difficult due to the oscillations in the force history. In addition, a specific sequence of damage events may be identified during quasi-static loading while the final damage state is only identifiable after a drop-weight impact test.  
5.2.2 To provide an estimate of the impact energy required to obtain a similar damage state for drop-weight impact testing if all others parameters are held constant.  
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FIG. 1 Quasi-Static Indentation Test  
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1.3 The test method may be used to screen materials for damage resistance, or to inflict damage into a specimen for subsequent damage tolerance testing. The indented plate can be subsequently tested in accordance with Test Method D7137/D7137M to measure residual strength properties. Drop-weight impact per Test Method D7136/D7136M may be used as an alternate method of creating damage from an out-of-plane force and measuring damage resistance properties.  
1.4 The damage resistance properties generated by this test method are highly dependent upon several factors, which include specimen geometry, layup, indenter geometry, force, and boundary conditions. Thus, results are generally not scalable to other configurations, and are particular to the combination of geometric and physical conditions tested.  
1.5 Units—The values stated in either SI units or inch-pound u...

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