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Calculation of the cyclic hardening curves of fatigued FCC monocrystals using a two‐phase model
Author(s) -
Blochwitz C.
Publication year - 1983
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170181120
Subject(s) - amplitude , hardening (computing) , nucleation , materials science , superposition principle , cyclic stress , thermodynamics , composite material , physics , optics , layer (electronics) , quantum mechanics
The cyclic hardening curve of fatigued fcc monocrystals shows a maximum of the stress amplitude if the plastic resolved shear strain amplitude γ ap exceeds the threshold value γ M for the formation of persistent slip bands (PSBs). Using a simple two‐phase model the typical shape of the cyclic hardening curve will be calculated for lower γ ap values. The calculation takes into account the fact that the PSB formation starts already at a „nucleation stress” amplitude τ n below the maximum stress amplitude τ am . Qualitatively the maximum of the cyclic hardening curve follows from the superposition of cyclic hardening of the matrix volume and of volume growth of the „soft” PSB phase between the nucleation cycle number N n and the saturation cycle number N s .