Some Micromechanical Aspects of Damage and Fracture

P. Brož

Abstract


The failure mode is described by means of elasto-plastic fracture mechanics and the main aspects of fatigue crack behaviour are itemized. The crux of the matter is the presentation of the pplicability limits of the three substantially different fatigue fracture mechanics equations based on fatigue crack propagation development. In the course of this, the microstructural effects,  predominantly crystallographic identification, grain dimension, and second phase structures are considered. For some sorts of FCC polycrystalline metals, the fatigue life and micro-damage heterogeneity are investigated, especially the stage of early plastic fatigue damage initiation while emphasizing slip theory and the localization homogenization technique. An internal damage variable ds is applied to illustrate of the micro-damage of each slip system.

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ISSN 1210-2709 (Print)
ISSN 1805-2363 (Online)
Published by the Czech Technical University in Prague