ASTM D5229 / D5229M - 92(2004)
ASTM D5229 / D5229M - 92(2004) Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
Active Standard ASTM D5229 / D5229M Developed by Subcommittee: D30.04 |Book of Standards Volume: 15.03
1. 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.
ASTM Standards
D2584 Test Method for Ignition Loss of Cured Reinforced Resins
D2734 Test Methods for Void Content of Reinforced Plastics
D3171 Test Method for Constituent Content of Composite Materials
D3878 Terminology for Composite Materials
D570 Test Method for Water Absorption of Plastics
D618 Practice for Conditioning Plastics for Testing
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
Military Standard
MIL-B-131 Barrier Materials, Watervaporproof, Greaseproof, Flexible, Heat-Sealable
Index Terms
conditioning; moisture absorption; moisture desorption; moisture diffusivity; moisture equilibrium; polymer matrix composite materials; ICS Number Code 83.140.20 (Laminated sheet
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Composite Standards
ASTM's composite standards are instrumental in the evaluation and determination of the physical, shear, tensile, flexural, and compressive properties of various forms of composite materials used in structural applications. These composites can be in the form of sandwich core materials, honeycomb core materials, polymer matrix composite materials and their laminates, fiber-reinforced polymer-matrix composite plates and bars, fiber reinforced metal matrix composites, carbon fiber-epoxy prepregs, continuous filament carbon and graphite fiber tows, hoop wound polymer matrix composite cylinders, sandwich beams, flat composite panels, simply supported sandwich composite plates, and fabric-reinforced textile composite materials. These composite standards are also helpful in guiding manufacturers and users of such materials in their proper fabrication and testing for the assurance of their quality.
List of composite standards developed by ASTM:
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Constituent/Precursor Properties
Editorial and Resource Standards
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Standard Guide for Testing Polymer Matrix Composite Materials | |
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Standard Practice for Fiber Reinforcement Orientation Codes for Composite Materials | |
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Lamina and Laminate Test Methods
Other standards developed by ASTM committees: