1、Designation:D8131/D8131M171Standard Practice forTensile Properties of Tapered and Stepped Joints ofPolymer Matrix Composite Laminates1This standard is issued under the fixed designation D8131/D8131M;the number immediately following the designation indicates theyear of original adoption or,in the cas
2、e 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.1NOTEEditorial changes made in September 2017.1.Scope1.1 This test practice defines the procedure for determ
3、ina-tion of the tensile strength of a tapered or stepped joint ofpolymer matrix composite materials.It is applicable to second-ary bonded or co-bonded laminates with either unidirectionalplies or woven fabric reinforcements.The materials to bebonded may be different material systems.In the bondline,
4、aseparate adhesive material may or may not be used(example:adhesives may be used with a prepreg system or may not beused with a wet lay-up repair system).The range of acceptabletest laminates and thicknesses is described in 8.2.1.1.2 This practice supplements Test Method D3039/D3039Mfor tensile load
5、ing.Several important test specimen parameters(for example,joint length,ply overlaps,step depth,and taperratio)are not mandated by this practice,however,theseparameters are required to be specified and reported to supportrepeatable results.1.3 Unidirectional(0 ply orientation)tape composites,textile
6、 composites,as well as multidirectional compositelaminates,can be tested.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.1.4.1 Within the text the inch-pound units are shown inbrackets.The values stated in each system are not exactequivalents;the
7、refore,each system must be used indepen-dently of the other.Combining values from the two systemsmay result in nonconformance with the standard1.5 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 t
8、o establish appro-priate safety,health and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princi
9、ples 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:2D792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD88
10、3 Terminology Relating to PlasticsD3039/D3039M Test Method for Tensile Properties of Poly-mer Matrix Composite MaterialsD3171 Test Methods for Constituent Content of CompositeMaterialsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium
11、 Conditioning of Polymer MatrixComposite MaterialsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE177 Pract
12、ice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE2533 Guide for Nondestructive Testing of Polymer MatrixComposites Used in Aerospace Applications2.2 Other Documents:3CMH-17 Composite Materials Handbook-17 Volume I3.Terminology3.1 Term
13、inology D3878 defines terms relating to high-modulus fibers and their composites.Terminology D883 de-fines terms relating to plastics.Terminology E6 defines terms1This practice is under the jurisdiction of ASTM Committee D30 on CompositeMaterials and is the direct responsibility of Subcommittee D30.
14、05 on Structural TestMethods.Current edition approved Aug.1,2017.Published August 2017.Originallyapproved in 2017.DOI:10.1520/D8131_D8131M-17E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volu
15、me information,refer to the standards Document Summary page onthe ASTM website.3Available for purchase in print and e-book format from SAE International,http:/books.sae.org/r-422/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis interna
16、tional 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.1 relating to mechanical testing.Terminology E456 and PracticeE177 define terms relating to statistics.In the event of aconflict between terms,Terminology D3878 shall have prece-dence over the other
