P. Delobelle et R. Lachat, MODELING OF AN AUSTENITIC STAINLESS-STEEL AT HIGH-TEMPERATURE UNDER IN-PHASE AND OUT-OF-PHASE CYCLIC TENSION-TORSION LOADING, European journal of mechanics. A, Solids, 14(3), 1995, pp. 397-412
Results are presented for experiments performed on austenitic stainles
s steel type 316 L at a temperature of 600 degrees C. The tests were c
arried out under both unidirectional (1D) and bidirectional (2D) cycli
c tension-torsion loading, both in and out of phase and with one (in t
he case of 2D ratcheting) or two cyclic components. For the 2D loading
s, it is shown that a weak supplementary hardening Delta H+ appears th
at is primarily a function of the phase difference Phi between the str
ain components, and the ratio R between the maximum amplitudes of thes
e components. These observations conform qualitatively with those alre
ady reported for ambient temperatures; but quantitatively it is shown
that the maximum amplitude of this supplementary hardening is a sharpl
y decreasing function of the temperature. A simple phenomenological fo
rmulation is proposed which, when integrated into a unified visoplasti
c model, developed elsewhere, leads to a good representation of the ex
perimental results under cyclic 1D and 2D loadings. The model describe
s the effects due to the loading rate, the phase difference between th
e two cyclic components, and the 2D tensile-torsion ratchet.