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ASTM C481-99(2005)

(Test Method)

Standard Test Method for Laboratory Aging of Sandwich Constructions

Standard Test Method for Laboratory Aging of Sandwich Constructions

SIGNIFICANCE AND USE
Most sandwich panels are subjected to various temperature and humidity environments. This laboratory aging test determines the selected panel property degradation under simulated conditions.
These test methods provide a standard method of obtaining simulated environmental degradation data for quality control, acceptance specification testing, and research and development; however, these laboratory aging test procedures do not have any correlation with natural weathering conditions.
SCOPE
1.1 This test method covers the determination of the resistance of sandwich panels to severe exposure conditions as measured by the change in selected properties of the material after exposure. The exposure cycle to which the specimen is subjected is an arbitrary test having no correlation with natural weathering conditions.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given may be approximate.
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

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

Relations

Replaces
ASTM C481-99 - Standard Test Method for Laboratory Aging of Sandwich Constructions
Effective Date
01-Mar-2005
Replaced By
ASTM C481-99(2011) - Standard Test Method for Laboratory Aging of Sandwich Constructions
Effective Date
01-Aug-2011
Referred By
ASTM D4762-18 - Standard Guide for Testing Polymer Matrix Composite Materials
Effective Date
01-Mar-2005
Referred By
ASTM E1091-21 - Standard Specification for Nonmetallic Honeycomb Core for Use in Shelter Panels
Effective Date
01-Mar-2005

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ASTM C481-99(2005) - Standard Test Method for Laboratory Aging of Sandwich Constructions
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:C481–99 (Reapproved 2005)
Standard Test Method for
Laboratory Aging of Sandwich Constructions
This standard is issued under the fixed designation C481; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 3. Significance and Use
1.1 This test method covers the determination of the resis- 3.1 Most sandwich panels are subjected to various tempera-
tance of sandwich panels to severe exposure conditions as ture and humidity environments. This laboratory aging test
measured by the change in selected properties of the material determines the selected panel property degradation under
after exposure. The exposure cycle to which the specimen is simulated conditions.
subjected is an arbitrary test having no correlation with natural 3.2 These test methods provide a standard method of
weathering conditions. obtainingsimulatedenvironmentaldegradationdataforquality
1.2 The values stated in SI units are to be regarded as the control, acceptance specification testing, and research and
standard. The inch-pound units given may be approximate. development; however, these laboratory aging test procedures
1.3 This standard does not purport to address all of the donothaveanycorrelationwithnaturalweatheringconditions.
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
4.1 Water tank, steam sprayer, oven, and freezer,allcapable
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. of maintaining the required environment.
4.2 Test apparatus, shall conform to the appropriateASTM
2. Referenced Documents
Test Method listed in Section 2.
2.1 ASTM Standards:
5. Test Specimens
C273 Test Method for Shear Properties of Sandwich Core
Materials 5.1 The test specimens shall conform to the appropriate
C297/C297M Test Method for Flatwise Tensile Strength of ASTM Test Method listed in Section 2.
Sandwich Constructions
6. Aging Test Procedures
C363 Test Method for Delamination Strength of Honey-
6.1 Subject each specimen to six complete cycles of labo-
comb Core Materials
ratory aging, using either Cycle A (more severe) or Cycle B
C364 Test Method for Edgewise Compressive Strength of
(milder). The time interval between cycles shall not exceed 30
Sandwich Constructions
min.
C365/C365M Test Method for Flatwise Compressive Prop-
6.2 Cycle A:
erties of Sandwich Cores
6.2.1 Totally immerse the specimen horizontally in water at
C393 Test Method for Flexural Properties of Sandwich
50 6 2°C (120 6 3°F) for 1 h.
Constructions
6.2.2 Spraywithsteamandwatervaporat95 63°C(200 6
D1781 Test Method for Climbing Drum Peel forAdhesives
5°F) for 3 h.
6.2.3 Store at−12 6 3°C (10 6 5°F) for 20 h.
This specification is under the jurisdiction of ASTM Committee D30 on
6.2.4 Heat at 100 6 2°C (210 6 3°F) in dry air for 3 h.
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
6.2.5 Spray again with steam and water vapor at 95 6 3°C
Sandwich Construction.
(200 6 5°F) for 3 h.
Current edition approved Mar. 1, 2005. Published March 2005. Originally
6.2.6 Heat in dry air at 100 6 2°C (210 6 3°F) for 18 h.
approved in 1961. Last previous edition approved in 1999 as C481–99. DOI:
10.1520/C0481-99R05.
6.3 Cycle B:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.3.1 Totally immerse the specimen horizontally in water at
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
50 6 3°C (120 6 5°F) for 1 h.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.3.2 Heat in dry air at 70 6 3°C (1
...

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5.1 Characterizing tack for different prepreg materials, test parameters, surface combinations, and environmental conditions provides insight for optimizing process parameters (particularly deposition rate and deposition temperature) for industrial automated material placement processes.  
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1.1 This test method covers measurement of adhesion (tack) between partially cured (B-staged) composite prepreg and a surface in a peel test, under specified conditions. The test may be conducted to measure tack between a flexible layer of prepreg and another prepreg layer bonded to a rigid substrate (Method I) or a rigid metal substrate (Method II). This test method is primarily geared towards material characterization for automated material layup but can be modified for use with other processes. It is well known that material tack is a function of multiple processing and environmental variables. Permissible composite prepreg materials include carbon, glass, and aramid fibers within a B-staged thermoset resin.  
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5.1 This test method is designed to determine the glass transition temperature of continuous fiber reinforced polymer composites using the DMA method. The DMA Tg value is frequently used to indicate the upper use temperature of composite materials, as well as for quality control of composite materials.
SCOPE
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1.4 The values stated in SI units are standard. The values given in parentheses are non-standard mathematical conversions to common units that are provided for information only.  
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5.1 The prepreg volatiles content, matrix content, reinforcement content, and filler content of composite prepreg materials are used to control material manufacture and subsequent fabrication processes, and are key parameters in the specification and production of such materials, as well as in the fabrication of products made with such materials.  
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