A. Bouchou et P. Delobelle, BEHAVIOR AND MODELING OF A 17-12-SPH STAINLESS-STEEL UNDER CYCLIC, UNI AND BIDIRECTIONAL, ANISOTHERMAL LOADINGS .1. BEHAVIOR, International journal of plasticity, 12(3), 1996, pp. 295-309
It is shown in this article that a knowledge of the mechanical behavio
r of the 17-12 SPH stainless steel for different isotherms (20 less th
an or equal to 7 less than or equal to 650 degrees C) is insufficient
to correctly describe its behavior under anisothermal thermomechanical
loadings. Indeed, this alloy possesses a temperature history memoriza
tion effect at intermediate temperatures. This phenomena is studied in
detail with experiments performed under uniaxial and biaxial mechanic
al loadings (in-phase or out-of-phase tensile-torsion tests) for diffe
rent isotherms belonging to judiciously chosen temperature history seq
uences. The results of cyclic torsion tests under anisothermal thermom
echanical conditions are presented where strain and temperature loadin
g evolve simultaneously in-phase, in-phase-opposition, in 1/4 and 3/4
phase. The analysis of the totality of results shows that the material
memorizes the maximal value of the cyclic stress peak reached in the
zone where the derivative of the maximal cyclic stress with respect to
the temperature is positive. This observation can also be applied to
both uniaxial or biaxial cyclic tests. From a physical point of view,
this behavior is closely related to the interaction phenomena between
dislocations and point defects in insertion solid solutions. A bibliog
raphical study of different materials tested under anisothermal condit
ions confirms this observation.