The Influence of Mechanical Prehistory on the Cyclic Stress-Strain Response and Microstructure of Single-Phase Metallic Materials

Fatigue of OFHC pure copper and 316L stainless steel subjected to prior tensile and cyclic prestrains

“…The explanation of this memory phenomenon has always been investigated at the microstructural scale and, up to now, the stability of the dislocation structures created during prestraining has always seemed to be a key point of the memory effect [10,15,22,23]. Such idea was recently reinforced by previous works [4,24].…”

“…Moreover, this difference of stress level, henceforth called "memory effect", is not the only parameter affected by a prestrain and modifications of other mechanical properties were also reported (e.g. cyclic stress-strain response and fatigue life [4][5][6][7][8][9][10][11][12][13][14][15], creep and ratcheting tendencies [14,[16][17][18][19][20] and fracture toughness [21]). Memory effect is thus of an overall importance for metallic materials.…”

“…In addition to the slip character, the magnitude of the prehardening is also of primary importance in the understanding of memory effect [10,34,35]. In particular, it was reported that a certain prestrain threshold might have to be overcome before the observation of memory [12].…”

“…Afterward, the memory phenomenon impacting the cyclic behavior has been characterized for several materials (e.g. α-brass [10,13,23], Al-Cu alloys [9,22], Ni superalloys [6,28,29], pure copper [9,13,[30][31][32], pure nickel [33]) revealing that the wavy slip materials are less sensitive to prior hardening than the planar slip ones.…”