I am observing some distortion (very small, indeed) of a large AISI 304 structure, cyclically loaded at a low stress (from 0 to 70 MPa) and at a low temperature (from 25 to 40°C). Is any microstructural damage or creep possible, which generates some deformation after 10000 cycles?
Dear Matteo,
Not creep, but probably (low-cycle) fatigue, see e.g. enclosed article.
Regards
Dear sir,
you are testing a large structure of 304 under cyclic loading with a non zero mean stress and your calculation of cyclic stress is 0-70MPa. Is there a possibility that locally at some place on load path there is yielding which is causing local high strains there and over all structure is showing a ratchetting behavior under cyclic loading.
Regards
Good observations. 304L may have some low stress and low frequency creeping.
Ratchetting may cause strain, not creep. So the wording "creeping" should not be used in this context to avoid any confusion.
I’m sorry to insist ! « Cyclic creep » is often used as a synonym for ratcheting but this habit should be restricted to cases at creep temperatures. Even if temperatures of 25 to 40°C are creep temperatures for several materials, like lead, concrete, … they are not for AISI 304. So, one should avoid using it here ! « Cyclic plasticity » would have a meaning but not « cyclic creep ».
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