Designation:C273/C273M07aStandard Test Method forShear Properties of Sandwich Core MaterialsThis standard issued under thefixed designation273/C273M;the number immediately following the designation indicates the year original adoption or,the case revision,the year last revision.number parentheses indicates the year last reapproval. superscript epsilon indicates an editorial change since the last revision reapproval.This standard has been approved for use by agencies the Department Defense.1.ScopeThis test method covers the determination of shear properties of sandwich construction core materials associated with shear distortion of planes parallel to the facings.covers the determination of shear strength parallel to the plane of the sandwich,and the shear modulus associated with strains in plane normal to the facings.The test may be conducted on core materials bonded directly to the loading plates or the sandwich facings bonded to the plates.Permissible core material forms include those with continuous bonding surfaces(such as balsa wood and foams)as well as those with discontinuous bonding surfaces(such as honeycomb).1.2The 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.1.3This standard does not purport to address all of the safety concerns,any,associated with its use.the responsibility 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 Documents2.1ASTM Standards:271/C271M Test Method for Density of Core Sandwich Materials274Terminology of Structural Sandwich Constructions 393Test Method for Flexural Properties of Sandwich ConstructionsD792Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883Terminology Relating to PlasticsD2584Test Method for Ignition Loss of Cured Reinforced ResinsD2734Test Methods for V oid Content of Reinforced Plas-ticsD3171Test Methods for Constituent Content of Composite MaterialsD3878Terminology for Composite MaterialsD5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Ma-trix Composite MaterialsD5687/D5687M Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Prepara-tionD5961/D5961M Test Method for Bearing Response of Polymer Matrix Composite LaminatesPractices for Force Verification of Testing MachinesTerminology Relating to Methods of Mechanical Test-ing122Practice for Calculating Sample Size to Estimate, With Specified Tolerable Error,the Average forCharacteristic of Lot or Process177Practice for Use of the Terms Precision and Bias in ASTM Test Methods456Terminology Relating to Quality and Statistics1309Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databases1434Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases1471Guide for Identification of Fibers,Fillers,and Core Materials in Computerized Material Property Databases 3.Terminology3.1Definitions—Terminology D3878defines terms relating to high-modulusfibers and their composites.Terminology 274defines terms relating to structural sandwich construc-tions.Terminology D883defines terms relating to plastics. Terminology defines terms relating to mechanical testing. Terminology456and Practice177define terms relating to statistics.In the event of conflict between terms,Terminology D3878shall have precedence over the other terminologies.3.2SymbolsThis test method under the jurisdiction ASTM Committee D30on Composite Materials and the direct responsibility Subcommittee D30.09on Sandwich Construction.Current edition approved Oct.2007.Published October2007.Originally approved1951.Last previous edition approved200727307.For referenced ASTM standards,visit the ASTM website,www.astm.org, contact ASTM Customer Service service@astm.org.For Annual Book ASTM Standards volume information,refer the standard’s Document Summary page on the ASTM website.
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