Void growth and coalescence in f.c.c. single crystals

In this study, we investigate deformation behavior of f.c.c. single crystals containing microvoids by using three-dimensional finite element methods. The unit cell analysis has been conducted to study the effect of stress triaxialities, crystallographic orientations and initial void volume fractions...

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Bibliographic Details
Published in:International journal of mechanical sciences 2010-07, Vol.52 (7), p.863-873
Main Authors: Ha, Sangyul, Kim, KiTae
Format: Article
Language:English
Subjects:
Crystallographic orientation
Crystallography
Deformation
Exact sciences and technology
F.c.c. single crystal
Finite element method
Fundamental areas of phenomenology (including applications)
Inelasticity (thermoplasticity, viscoplasticity...)
Orientation
Physics
Single crystals
Solid mechanics
Stress triaxiality
Stresses
Structural and continuum mechanics
Triaxiality
Void growth and coalescence
Voids
Volume fraction
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Summary:In this study, we investigate deformation behavior of f.c.c. single crystals containing microvoids by using three-dimensional finite element methods. The unit cell analysis has been conducted to study the effect of stress triaxialities, crystallographic orientations and initial void volume fractions on the growth and coalescence of voids in f.c.c. single crystals. The locally homogeneous constitutive model for the rate-dependent single crystal plasticity is implemented into a finite element program (ABAQUS) by means of the user-defined subroutine (UMAT). To identify the effect of stress triaxiality and the crystallographic orientation on the void evolution, the stress triaxiality was kept constant during deformation. The numerical results showed that the stress triaxiality and the deformation mode specified by the crystallographic orientation have a competitive effect on the evolution of voids. For the low level of stress triaxiality, the deformation mode is mainly determined by the crystallographic orientation. For high stress triaxiality, however, the deviation from the specific deformation mode is large even for incipient void growth and the void growth rate is mainly determined by stress triaxiality and the initial void volume fraction. For the small initial void volume fraction, the growth rate of a void is rapid compared with the large one and the effect of the initial crystallographic orientation is significant.
ISSN:0020-7403
1879-2162
DOI:10.1016/j.ijmecsci.2010.03.001