A microstatistical model for ductile fracture with rate effects

A micromechanical ductile fracture model was used in a parametric study of void-induced softening. The model describes rate-dependent nucleation and growth of microscopic void size distributions. The Gurson yield surface is used as the threshold condition for viscous void growth. The relative amount...

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Bibliographic Details
Published in:Nuclear engineering and design 1987-12, Vol.105 (1), p.35-42
Main Authors: Seaman, L., Curran, D.R., Aidun, J.B., Cooper, T.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Fractures
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical properties of solids
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
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Summary:A micromechanical ductile fracture model was used in a parametric study of void-induced softening. The model describes rate-dependent nucleation and growth of microscopic void size distributions. The Gurson yield surface is used as the threshold condition for viscous void growth. The relative amounts of shear stress and mean stress relaxations due to void nucleation and growth in a material element are found to be strongly dependent on both the material viscosity and the path taken by the material element in stress space. Material elements subjected to uniaxial stress load paths show much less shear strength softening than those subjected to uniaxial strain load paths. Shear strength softening is enhanced by loading rates high enough to activate viscous response. Computational simulations of uniaxial stress and strain tests over a range of strain rate show a complicated interplay of the above factors.
ISSN:0029-5493
1872-759X
DOI:10.1016/0029-5493(87)90226-3