ASTM_B_831_-_14.pdf

Designation:B83114Standard Test Method forShear Testing of Thin Aluminum Alloy Products1This standard is issued under the fixed designation B831;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers single shear testing of thinwrought and cast aluminum alloy products to determine shearultimate strengths.It is intended for products that are too thinto be tested according to Test Method B769.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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 The following documents of the issue in effect on thedate of material purchase,unless otherwise noted,form a partof this specification to the extent referenced herein:2.2 ASTM Standards:2B565 Test Method for Shear Testing of Aluminum andAluminum-Alloy Rivets and Cold-Heading Wire andRodsB769 Test Method for Shear Testing of Aluminum AlloysE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE2208 Guide for Evaluating Non-Contacting Optical StrainMeasurement Systems3.Terminology3.1 DefinitionsThe definitions of terms relating to sheartesting in Terminology E6 are applicable to the terms used inthis test method.4.Summary of Test Method4.1 This test method consists of subjecting a full thicknessor machined rectangular test specimen to single shear force tofailure in a test fixture using a tension testing machine.Theshear strength is calculated from the maximum force requiredto fracture the specimen.5.Significance and Use5.1 The intent of this test method is to provide a means ofmeasuring the ultimate shear strength of thin aluminum alloywrought and cast products.It is recognized that the loadingconditions developed by this test method,and by most others,are not ideal in that they do not strictly satisfy the definitionsof pure shear.However,rarely do pure shear conditions exist instructures.NOTE1Results from this test method are not interchangeable withresults from Test Methods B565 and B769.Shear strengths obtained bythis test method have been shown to differ from values determined withother methods.36.Apparatus6.1 Testing MachinesThe testing machines shall conformto the requirements of Practice E4.The maximum force used todetermine the shear strength shall be within the verified forcerange of the testing machine as defined in Practice E4.6.2 Loading Device:6.2.1 The device for applying force to the specimen fromthe testing machine shall be a clevis of the type shown in Fig.1 and shall be made of a hardened steel.7.Test Specimens7.1 The specimen size shall be 1.5 in.(38.1 mm)wide by4.5 in.(114 mm)long.The specimen geometry is shown in Fig.2.The specimen thickness shall be the full product thicknessfor a product thickness of 0.250 in.(6.35 mm)or less.For aproduct thickness greater than 0.250 in.(6.35 mm),thespecimen shall be machined to a thickness of 0.250 in.(6.35mm)by machining equal amounts from each side of the1This test method is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.05 onTesting.Current edition approved May 1,2014.Published July 2014.Originally approvedin 1993.Last previous edition approved in 2011 as B831 11.DOI:10.1520/B0831-14.2For 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.3Davies,R.E.,and Kaufman,J.G.,“Effects of Test Method and SpecimenOrientation on Shear Strengths of Aluminum Alloys,”Proceedings,ASTM,Vol 64,1964.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 product.The minimum specimen thickness that can be reason-ably tested will be dictated by the materials ability to resistbuckling around the pin hole area during testing.7.2 The test area to be sheared shall be centered within0.001 in.(0.025 mm)of the load line of the specimen.7.3 Measure and record the thickness(t)and length(L)ofthe area to be sheared.Measurements shall be made as follows:7.3.1 Measurement of the specimen thickness shall be madeat a location between the two slots machined into the specimen.Measurement of the