ASTM F38-18 pdf download

03-21-2022 comment

ASTM F38-18 pdf download.Standard Test Methods For Creep Relaxation Of A Gasket Material.
ASTM F38 provides a means of measuring the amount of creep relaxation of a gasket material at a predetermined time after a compressive stress has been applied.
Test Method A—Creep relaxation measured by means of a calibrated strain gauge on a bolt.
Test Method B—Creep relaxation measured by means of a calibrated bolt with dial indicator.
The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
3.Summary of Test Methods
3.1 In both test methods the specimen is subjected to acompressive stress between two platens,with the stress appliedby a nut and bolt.
3.2 In Test Method A,normally run at room temperature,the stress is measured by a calibrated strain gauge on the bolt.In running the test,strain indicator readings are taken at intervals of time,beginning at the loading time,to the end of the test.The strain indicator readings are converted to percentages of the initial stress which are then plotted against the log of timein hours.The percentage of initial stress loss or relaxation can be read off the curve at any given time,within the limits of the total test time.
3.3 In Test Method B,run at room or elevated temperatures,the stress is determined by measuring the change in length of the calibrated bolt with a dial indicator.The bolt length is measured at the beginning of the test and at the end of the test;from this the percentage of relaxation is calculated.

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