ASTM F38-18 Standard Test Methods for Creep Relaxation of a Gasket Material

Designation: F38-18 Standard Test Methods for Creep Relaxation of a Gasket Material1 1. Scope l.l These test methods provide a means of measuring theamount of creep relaxation of a gasket material at a predcter-mined time after a compressive stress has been applied. 1.1.1 Tesr Merhodd A'Creep relaxation measured by meansof a calibrated strain gauge on a bolt. 1.1.2 Tesr Method B—Creep relaxation mcasured by mcansof a calibrated bolt with dial indicator. 1.2 The values stated in Sl units are to be regarded asstandard.The values given in parentheses are for informationonly. 1.3 This standard does nor pwrport to address all of thescfety conceras.if ary,associated with irs use. It is theresposibility of the user of this sfandard to establish cppro-priate sefery, healse. cxnd ervirorrtenal practices and deter-waive rhe applicabiliry of reguaictory linitasions porior to use. 1.4 This international srandard was developed in accor-dance with inrernafiovally recognized principles owr sianderd-ization esiablished in the Decision on Principles for theDevelopmen of Internctional Srandards，Guides and Recon-mendetions issued by the World Trade Organizcation TechricclBarriers ro Trade(TBT) Comanizee. 2. Referenced Documents 2.1 ASTM Standards:2 A193A193M Specification for Alloy-Stcel and StainlessSteel Bolting for High Temperature or High PressureService and Other Special Purpose Applications B637 Speeification for Precipitation-Hardening and ColdWorked Nickel Alloy Bars，Forgings.and Forging Stockfor Moderate or High Temperature Service D3040 Practice for Preparing Precision Statements for Stan- F38- 18 Standard Test Methods for Creep Relaxation of a Gasket Material