ASTM_D_6308_-_92_scan.pdf

C l S T b Designation:D 6308-92 AMERICAN SOCIETY FOR TESTING AND MATERIALS 100 Barr Harbor Dr.,West Consh&xken,PA 19428 Reprinted from the Annual Book of ASTM Standards.Copyright ASTM Standard Guide for Identification of Composite Materials in Computerized Material Property Databases This standard is issued under the fixed designation D 6308;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(e)indicates an editorial change since the last revision or reapproval.1.Scope 1.1 This guide establishes the essential and desirable elements of data required for the identification of composite materials in computerized material property databases.A recommended format for entry of these fields into a comput-erized database is also provided.Examples of the application of this guide are included for filament-wound polymer-matrix composites,laminar polymer-matrix composites,and ceramic-matrix composites.An example for metal-matrix composites is planned for the next revision.1.2 The recommended format described in this document is suggested for use in recording data in a computerized database,which is different from contractual reporting of actual test results.The latter type of information is described in a materials specification or shown on business transac-tions,and is subject to agreement between vendor and purchaser.1.3 This guide defines the information which is consid-ered essential to uniquely describe a composite material.A format is recommended for placing these data in fields suitable for a computerized database.Additional fields which are considered desirable,but not essential,are also defined.The purpose is to facilitate efficient storage and retrieval of the information with a computer and to allow meaningful comparison of data from different sources.2.Referenced Documents 2.1 ASTM Standards:C 274 Terminology of Structural Sandwich Constructions D 3878 Terminology of High-Modulus Reinforcing Fibers and Their Composites2 E 1338 Guide for the Identification of Metals and Alloys in Computerized Material Property Databases3 E 1443 Terminology Relating to Building and Accessing Material and Chemical Databases3 E 1471 Guide for the Identification of Fibers,Fillers,and Core Materials in Computerized Material Property Databases*3.Terminology be used where applicable.3.1 Definitions-Terminology D 3878 and E 1443 shall I This guide is under the jurisdiction of ASTM Committee D-30 on Composite Materials and is the direct responsibility of Subcommittee D30.01 on Editorial and Resource Standards.Current edition approved March 15,1992.Published May 1992.Originally published as E 1309-92.Redesignated D 6308-92 in 1998.Last previous edition E 1309-92.Annual Book o f ASTM Standards,Vol 15.03.3 Annual Book o f ASTM Standards,Vol 14.01.1 3.2 Descriptions o f Terms Specific to This Standard:3.2.1 composite material,n-a material consisting of two or more materials,insoluble in one another,which are combined on a macroscale to form a useful engineering material possessing certain properties not possessed by the constituents.DISCUSSION-A composite material is inherently inhomogeneous on a microscopic scale but can often be assumed to be homogeneous on a macroscopic scale for certain engineering applications.3.2.2 core,n-a generally,centrally located layer or com-posite component of a sandwich construction,usually low density,which separates and stabilizes the facings and transmits shear between them and provides most of the shear rigidity of the construction (see Terminology C 274).3.2.3 essential,field,n-a field in a record which must be filled in order to meet the requirements of a stated type of database (see Terminology E 1443).DncussloN-Fields are considered essential if they are required to make a meaningful Comparison of property data from different sources.A comparison of data from different sources may still be possible if essential information is omitted,but the value of the comparison may be greatly reduced.3.2.4 field,n-an elementary unit of a record that may contain a data item,a data aggregate,a pointer,or a link (see Terminology E 1443).3.2.5 field name,n-a name or code associated with a field and used for identification (see Terminology E 1443).3.2.6 gel point,n(or gel time)-a point in a cure cycle where a thermosetting polymer resin resolidifies after melting.3.2.7 isotropic material,n-a material in which a prop-erty of interest,at a given point,possesses an infinite number of planes of material symmetry,yielding the same property value in all directions.3.2.8 luy-up,n-a process of fabrication involving the placement of successive layers of materials.3.2.9 luy-up code,n-an abbreviated form of stacking sequence information.3.2.10 matrix,n-in composite materials,the continuous constituent of a composite material which acts as the load transfer