Study on Stress Corrosion Cracking of Austenitic Stainless Steel and Its Welded Joint under Pulsating Load (Report 3)
Cracking properties under pulsating sine wave load
1973 Volume 42 Issue 2 Pages 100-105
Details
1973 Volume 42 Issue 2 Pages 100-105
In this report we studied the effect of stress pulsation on resistance to stress corrosion cracking of AISI304 stainless steel in the boiling soultion of 42 % MgCl2 under partial pulsating sine wave load.
The experimental time to failure of stress corrosion cracking test was compared with the estimated time to failure calculated according to the static linear damage law, in which the time to failure was given as the accumulation of only static damage.
The in fluence of the variation of stress amplitude on the life is larger for the case in which the mean stress is low than for the case of the mean stress being high.
Moreover, when the stress amplitude is comparatively small (within about 4 kg/mm2), the estimated time to failure teq calculated according to the static linear damage law almost coincides with the experimental value and so the static linear damage law is applicable.
When the minimum stress σmin in the sine wave load is larger than the threshold stress of static stress corrosion cracking, the time to failure can be estimated by the time to failure of the static stress corrosion cracking test at the stress σmin and the stress variation ratio.
The threshold stress of streess corrosion cracking which is important from the viewpoint of design is also varied by the change of stress amplitude. When the threshold stress under the pulsating stress is expressed by the equivalent static stress, it almost coincides with the threshold stress under static stress.
