ASTM_D_5229_-_D_5229M_-_14.pdf

Designation:D5229/D5229M14Standard Test Method forMoisture Absorption Properties and EquilibriumConditioning of Polymer Matrix Composite Materials1This standard is issued under the fixed designation D5229/D5229M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.INTRODUCTIONConsistent evaluation and comparison of the response of polymer matrix composites to moistureabsorption can only be performed when the material has been brought to a uniform through-the-thickness moisture profile.The procedures described in Test Method D570 and Practices D618 do notguarantee moisture equilibrium of the material.A similar,but more rigorous,procedure forconditioning to equilibrium is described by this test method,which can also be used with fluidmoisture other than water,and which,additionally,can provide the moisture absorption propertiesnecessary for the analysis of single-phase Fickian moisture diffusion within such materials.1.Scope1.1 This test method covers a procedure for the determina-tion of moisture absorption or desorption properties in thethrough-the-thickness direction for single-phase Fickian solidmaterials in flat or curved panel form.Also covered areprocedures for conditioning test coupons prior to use in othertest methods;either to an essentially moisture-free state,toequilibrium in a standard laboratory atmosphere environment,or to equilibrium in a non-laboratory environment.Alsoincluded are procedures for determining the moisture lossduring elevated temperature testing,as well as moisture lossresulting from thermal exposure after removal from the con-ditioning environment,such as during strain gage bonding.While intended primarily for laminated polymer matrix com-posite materials,these procedures are also applicable to othermaterials that satisfy the assumptions of 1.2.1.2 The calculation of the through-the-thickness moisturediffusivity constant in Procedure A assumes a single-phaseFickian material with constant moisture absorption propertiesthrough the thickness of the specimen.The validity of theequations used in Procedure A for evaluating the moisturediffusivity constant in a material of previously unknownmoisture absorption behavior is uncertain prior to the test,asthe test results themselves determine if the material follows thesingle-phase Fickian diffusion model.A reinforced polymermatrix composite material tested below its glass-transitiontemperature typically meets this requirement,although two-phase matrices such as toughened epoxies may require amulti-phase moisture absorption model.While the test proce-dures themselves may be used for multi-phase materials,thecalculations used to determine the moisture diffusivity constantin Procedure A are applicable only to single-phase materials.Other examples of materials and test conditions that may notmeet the requirements are discussed in Section 6.1.3 The evaluation by Procedure A of the moisture equilib-rium content material property does not assume,and istherefore not limited to,single-phase Fickian diffusion behav-ior.1.4 The procedures used by this test method may beperformed,and the resulting data reduced,by suitable auto-matic equipment.1.5 This test method is consistent with the recommendationsof CMH-17 Rev G(1),2which describes the desirable attri-butes of a conditioning and moisture property determinationprocedure.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not exact equivalents;therefore,each systemmust be used independently of the other.Combining valuesfrom the two systems may result in nonconformance with thestandard.1This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.04 onLamina and Laminate Test Methods.Current edition approved May 15,2014.Published May 2014.Originallyapproved in 1992.Last previous edition approved in 2012 as D5229/D5229M 12.DOI:10.1520/D5229_D5229M-14.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 1.6.1 Within the text the inch-pound units are shown inbrackets.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D570 Test Method for Water Absorption of PlasticsD618 Practice for Conditioning Plastic