ASTM_D_5687_-_D_5687M_-_20.pdf

Designation:D5687/D5687M20Standard Guide forPreparation of Flat Composite Panels with ProcessingGuidelines for Specimen Preparation1This standard is issued under the fixed designation D5687/D5687M;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.1.Scope1.1 This guide provides guidelines to facilitate the properpreparation of laminates and test specimens from fiber-reinforced organic matrix composite prepregs.The scope islimited to organic matrices and fiber reinforcement in unidi-rectional(tape)or orthagonal weave patterns.Other forms mayrequire deviations from these general guidelines.Other pro-cessing techniques for test coupon preparation,for example,pultrusion,filament winding and resin-transfer molding,arenot addressed.1.2 Specimen preparation is modeled as an 8-step processthat is presented in Fig.1 and Section 8.Laminate consolida-tion techniques are assumed to be by press or autoclave.Thispractice assumes that the materials are properly handled by thetest facility to meet the requirements specified by the materialsupplier(s)or specification,or both.Proper test specimenidentification also includes designation of process equipment,process steps,and any irregularities identified during process-ing.1.3 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system are not necessarily exact equiva-lents;therefore,to ensure conformance with the standard,eachsystem shall be used independently of the other,and valuesfrom the two systems shall not be combined.1.3.1 Within the text,the inch-pound units are shown inbrackets.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C297/C297M Test Method for Flatwise Tensile Strength ofSandwich ConstructionsD123 Terminology Relating to TextilesD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD2734 Test Methods for Void Content of Reinforced PlasticsD3163 Test Method for Determining Strength of AdhesivelyBonded Rigid Plastic Lap-Shear Joints in Shear by Ten-sion LoadingD3171 Test Methods for Constituent Content of CompositeMaterialsD3531 Test Method for Resin Flow of Carbon Fiber-EpoxyPrepregD3878 Terminology for Composite MaterialsD3990 Terminology Relating to Fabric DefectsD4850 Terminology Relating to Fabrics and Fabric TestMethodsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsE1237 Guide for Installing Bonded Resistance Strain Gages3.Terminology3.1 DefinitionsTerminology D3878 defines terms relatingto high-modulus fibers and their composites.TerminologyD883 defines terms relating to plastics.Terminology D123defines textile-related terms.Terminology D4850 defines termsrelating to fabric.In the event of a conflict between terms,Terminology D3878 shall have precedence over the otherstandards.3.2 Description of Terms Used in This StandardThe terms1This guide is under the jurisdiction of ASTM Committee D30 on CompositeMaterials and is the direct responsibility of Subcommittee D30.04 on Lamina andLaminate Test Methods.Current edition approved Oct.1,2020.Published November 2020.Originallyapproved in 1995.Last previous edition approved in 2015 as D5687/D5687M 95(2015).DOI:10.1520/D5687_D5687M-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.used in this guide may conflict with general usage.There is notyet an established consensus concerning the use of these terms.The following descriptions are intended only f