Experimental Study on Non-proportionally Multiaxial Time-dependent Ratcheting of SS304 Stainless Steel at Room Temperature

The time-dependent ratcheting behavior of SS304 stainless steel was experimental studied at room temperature under non-proportionally multiaxial cyclic loading.The effects of stressing rate,holding time and loading path on ratcheting were discussed in the paper.The results indicate that the ratcheting of the material presents remarkable time-dependence,i.e.,the ratcheting depends not only greatly on loading rate,but also apparently on hold time even at room temperature.Further more the ratcheting also presents greatly dependence on loading path.Some significant conclusions are achieved to construct a time-dependent consti-tutive model of ratcheting.