ASTM D5229/D5229M-92(2004)
(Test Method)Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
SCOPE
1.1 This test method covers a procedure (Procedure A) for the determination of moisture absorption or desorption properties in the through-the-thickness direction for single-phase Fickian solid materials in flat or curved panel form. Also covered are procedures for conditioning test coupons prior to use in other test methods; either to equilibrium in a non-laboratory environment (Procedure B), to equilibrium in a standard laboratory atmosphere environment (Procedure C), or to an essentially moisture-free state (Procedure D). While intended primarily for laminated polymer matrix composite materials, these procedures are also applicable to other materials that satisfy the assumptions of 1.2.
1.2 The calculation of the through-the-thickness moisture diffusivity constant in Procedure A assumes a single-phase Fickian material with constant moisture absorption properties through the thickness of the specimen. The validity of the equations used in Procedure A for evaluating the moisture diffusivity constant in a material of previously unknown moisture absorption behavior is uncertain prior to the test, as the test results themselves determine if the material follows the single-phase Fickian diffusion model. A reinforced polymer matrix composite material tested below its glass-transition temperature typically meets this requirement, although two-phase matrices such as toughened epoxies may require a multi-phase moisture absorption model. While the test procedures themselves may be used for multi-phase materials, the calculations used to determine the moisture diffusivity constant in Procedure A are applicable only to single-phase materials. Other examples of materials and test conditions that may not meet the requirements are discussed in Section 6.
1.3 The evaluation by Procedure A of the moisture equilibrium content material property does not assume, and is therefore not limited to, single-phase Fickian diffusion behavior.
1.4 The procedures used by this test method may be performed, and the resulting data reduced, by suitable automatic equipment.
1.5 This test method is consistent with the recommendations of MIL-HDBK-17B (1), which describes the desirable attributes of a conditioning and moisture property determination procedure.
1.6 This standard does not purport to address all of the safety problems, 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.
1.7 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.
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Designation: D5229/D5229M – 92 (Reapproved 2004)
Standard Test Method for
Moisture Absorption Properties and Equilibrium
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Conditioning of Polymer Matrix Composite Materials
This standard is issued under the fixed designation D5229/D5229M; 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.
INTRODUCTION
Consistent evaluation and comparison of the response of polymer matrix composites to moisture
absorption can only be performed when the material has been brought to a uniform through-the-
thickness moisture profile.The procedures described inTest Method D570 and Practices D618 do not
guarantee moisture equilibrium of the material. A similar, but more rigorous, procedure for
conditioning to equilibrium is described by this test method, which can also be used with fluid
moisture other than water, and which, additionally, can provide the moisture absorption properties
necessary for the analysis of single-phase Fickian moisture diffusion within such materials.
1. Scope multi-phase moisture absorption model. While the test proce-
dures themselves may be used for multi-phase materials, the
1.1 This test method covers a procedure (Procedure A) for
calculationsusedtodeterminethemoisturediffusivityconstant
the determination of moisture absorption or desorption prop-
in Procedure A are applicable only to single-phase materials.
erties in the through-the-thickness direction for single-phase
Other examples of materials and test conditions that may not
Fickian solid materials in flat or curved panel form. Also
meet the requirements are discussed in Section 1.4.
covered are procedures for conditioning test coupons prior to
1.3 The evaluation by ProcedureAof the moisture equilib-
use in other test methods; either to equilibrium in a non-
rium content material property does not assume, and is
laboratory environment (Procedure B), to equilibrium in a
therefore not limited to, single-phase Fickian diffusion behav-
standard laboratory atmosphere environment (Procedure C), or
ior.
to an essentially moisture-free state (Procedure D). While
1.4 The procedures used by this test method may be
intended primarily for laminated polymer matrix composite
performed, and the resulting data reduced, by suitable auto-
materials, these procedures are also applicable to other mate-
matic equipment.
rials that satisfy the assumptions of 1.2.
1.5 Thistestmethodisconsistentwiththerecommendations
1.2 The calculation of the through-the-thickness moisture
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of MIL-HDBK-17B (1), which describes the desirable at-
diffusivity constant in Procedure A assumes a single-phase
tributes of a conditioning and moisture property determination
Fickian material with constant moisture absorption properties
procedure.
through the thickness of the specimen. The validity of the
1.6 The values stated in either SI units or inch-pound units
equations used in Procedure A for evaluating the moisture
are to be regarded separately as standard. Within the text the
diffusivity constant in a material of previously unknown
inch-pound units are shown in brackets. The values stated in
moisture absorption behavior is uncertain prior to the test, as
each system are not exact equivalents; therefore, each system
thetestresultsthemselvesdetermineifthematerialfollowsthe
must be used independently of the other. Combining values
single-phase Fickian diffusion model. A reinforced polymer
from the two systems may result in nonconformance with the
matrix composite material tested below its glass-transition
standard.
temperature typically meets this requirement, although two-
1.7 This standard does not purport to address all of the
phase matrices such as toughened epoxies may require a
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
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This test method is under the jurisdiction of ASTM Committee D30 on
bility of regulatory limitations prior to use.
Composite Materials and is the direct responsibility of Subcommittee D30.04 on
Lamina and Laminate Test Methods.
Current edition approved Mar. 1, 2004. Published March 2004. Originally
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approved in 1992. Last previous edition approved in 1998 as D5229/D5229M–92 Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
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(1998) . DOI: 10.1520/D5229_D5229M-92R04. this standard.
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