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FATIGUE DAMAGE IN TWO STEP LOADING OF 316L STEEL I. EVOLUTION OF PERSISTENT SLIP BANDS
Author(s) -
Poláak J.,
Vašek A.,
Obrtlíak K.
Publication year - 1996
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1996.tb00954.x
Subject(s) - materials science , scanning electron microscope , lüders band , slip (aerodynamics) , composite material , plasticity , amplitude , strain (injury) , metallurgy , microstructure , optics , medicine , physics , thermodynamics
— An experimental study of the surface evolution during controlled plastic strain amplitude single‐step and two‐step loading tests reveals the important damage mechanisms for 316L stainless steel. In the first stage, the cyclic plastic strain is concentrated into persistent slip bands (PSBs) and a surface relief is formed consisting of extrusions and intrusions. The frequency of occurrence and the total density of PSBs has been assessed using systematic observations in a scanning electron microscope. The relative volume occupied by PSBs determines the fatigue damage in this stage. Two‐step loading has only a small effect on the PSB damage evolution and nearly equal saturated values (corresponding to the applied plastic strain amplitude) were achieved in the single‐step and the two‐step loading investigations.