ASTM_F_1276_-_99_2016.pdf

Designation:F127699(Reapproved 2016)Standard Test Method forCreep Relaxation of Laminated Composite Gasket Materials1This standard is issued under the fixed designation F1276;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.Scope1.1 This test method provides a means of measuring theamount of creep relaxation of a laminated composite gasketmaterial at a predetermined time after a compressive stress hasbeen applied.1.2 Creep relaxation is measured by means of a calibratedbolt with dial indicator.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A193/A193M Specification for Alloy-Steel and StainlessSteel Bolting for High Temperature or High PressureService and Other Special Purpose ApplicationsB637 Specification for Precipitation-Hardening and ColdWorked Nickel Alloy Bars,Forgings,and Forging Stockfor Moderate or High Temperature ServiceE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodF38 Test Methods for Creep Relaxation of a Gasket MaterialF104 Classification System for Nonmetallic Gasket Materi-alsF868 Classification for Laminated Composite Gasket Mate-rials2.2 ASTM Adjuncts:Relaxometer,Method B(Adjunct to Test Method F38)33.Summary of Test Method3.1 In this test method,the specimen is subjected to acompressive stress between two platens,with the stress appliedby a nut and bolt.Run at room or elevated temperatures,thestress is determined by measuring the change in length of thecalibrated bolt with a dial indicator.The bolt length ismeasured at the beginning of the test and at the end of the test.The percent relaxation is calculated from this.4.Significance and Use4.1 This test method is designed to compare related mate-rials under controlled conditions and their ability to maintain agiven compressive stress as a function of time.Aportion of thetorque loss on the bolted flange is a result of creep relaxation.Torque loss can also be caused by elongation of the bolts,distortion of the flanges,and vibration;therefore,the resultsobtained should be correlated with field results.This testmethod may be used as a routine test when agreed uponbetween the user and the producer.5.Apparatus5.1 Relaxometer,4composed of two platens,special drilledand calibrated bolt,washer and nut composed of SpecificationA193/A193M Grade B7 or Specification B637 Grade UNSN07718,or other alloys of construction that would satisfy thecalibration Procedure(see Annex)for the test temperaturespecified and a dial indicator assembly as shown in Fig.1.5.2 Box End Wrench.5.3 Steel Blanking Die.6.Test Specimens6.1 Specimen size shall be 10.16 6 0.381 mm(0.400 60.015 in.)wide by 31.75 6 0.381 mm(1.250 6 0.015 in.)long.1This test method is under the jurisdiction of ASTM Committee F03 on Gasketsand is the direct responsibility of Subcommittee F03.20 on Mechanical TestMethods.Current edition approved Oct.1,2016.Published October 2016.Originallyapproved in 1990.Last previous edition approved in 2009 as F1276 99(2009).DOI:10.1520/F1276-99R16.2For 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.3Detailed working drawings of this apparatus are available from ASTMHeadquarters,100 Barr Harbor Drive,West Conshohocken,PA 194282959 USA.Order Adjunct No.12-600-381-00.4Dario P.Bernasconi,40 Farrington St.,Stoughton,MA 02072,and Donald G.Johnson,Metal Samples,P.O.Box 8,Munford,AL 36268,are suppliers of therelaxometer.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 Four specimens are required per test.6.3 A minimum of three tests shall be conducted.6.4 Nominal thickness of specimens shall be that of thelaminated composite gasket.7.Conditioning7.1 When all nonmetallic layers of the laminated compositeare the same type,condition in accordance with that type asshown in Table 1.7.2 When the nonmetallic layers of the laminated compositeare of different types,the specimen shall be conditioned for 22h in a controlled-humidity room or in a closed chamber of airat 21 to 30C(70 to 85F)and 50 to 55%relative humidity.Inall cases where testing is conducted outside the area ofspecified humidity,specimens shall be removed from thechamber one at a time as neede