Publication de 6 numéros par an
ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352
IF:
1.4
5-Year IF:
1.3
Immediacy Index:
2.2
Eigenfactor:
0.00034
JCI:
0.46
SJR:
0.333
SNIP:
0.606
CiteScore™::
3.1
H-Index:
31
Indexed in
Multiscale Modeling of Deformation and Fracture of Polycrystalline Lamellar g-TiAl + a2-Ti3Al Alloys
Get access
RÉSUMÉ
The deformation behavior of fully-lamellar polycrystalline g-TiAl + a2-Ti3Al alloys has been analyzed using a finite element method. A three-dimensional rate-dependent, finite-strain, crystalplasticity based materials constitutive model is used to represent the deformation behavior of the bulk material. The constitutive behavior of g-TiAl/g-TiAl lamellar interfaces and lamellae-colony boundaries, on the other hand, are modeled using a cohesive-zone formulation. The interface/boundary potentials used in this formulation are determined through the use of atomistic simulations of the interface/boundary decohesion. The constitutive relations for both the g-TiAl + a2-Ti3Al bulk material and the lamellar interfaces and colony boundaries are implemented in the commercial finite element program Abaqus/Standard, within which the material state is integrated using an Euler-backward implicit formulation. The results obtained show that plastic flow localizes into deformation bands even at an overall strain level of only 0.5% and that incompatibilities in plastic flow between the adjacent colonies can give rise to high levels of the hydrostatic stress and, in turn, to intercolony fracture. Furthermore, it is found that when lamellar interfaces are admitted into colonies, fracture is delayed and the materials fail in a more gradual manner.
-
Michopoulos John G., Farhat Charbel, Fish Jacob, Modeling and Simulation of Multiphysics Systems, Journal of Computing and Information Science in Engineering, 5, 3, 2005. Crossref
-
Fish Jacob, Bridging the scales in nano engineering and science, Journal of Nanoparticle Research, 8, 5, 2006. Crossref
-
Fish Jacob, Chen Wen, Discrete-to-continuum bridging based on multigrid principles, Computer Methods in Applied Mechanics and Engineering, 193, 17-20, 2004. Crossref
-
Warner D. H., Sansoz F., Molinari J. F., Modeling of Deformation in Nanocrystalline Copper Using An Atomistic-Based Continuum Approach, MRS Proceedings, 791, 2003. Crossref
-
Zhang Junqian, Wang Fang, Modeling of Progressive Failure in Ductile Matrix Composites Including Local Matrix Yielding, Mechanics of Advanced Materials and Structures, 16, 7, 2009. Crossref
-
Sansoz F, Molinari J.F, Incidence of atom shuffling on the shear and decohesion behavior of a symmetric tilt grain boundary in copper, Scripta Materialia, 50, 10, 2004. Crossref
-
Grujicic M., Ramaswami S., Snipes J. S., Yen C.-F., Cheeseman B. A., Montgomery J. S., Multiphysics Modeling and Simulations of Mil A46100 Armor-Grade Martensitic Steel Gas Metal Arc Welding Process, Journal of Materials Engineering and Performance, 22, 10, 2013. Crossref
-
Yang Jerry Z., Mao Chao, Li Xiantao, Liu Chun, On the Cauchy–Born approximation at finite temperature, Computational Materials Science, 99, 2015. Crossref
-
Grujicic M., Chenna V., Galgalikar R., Snipes J. S., Ramaswami S., Yavari R., Wind-Turbine Gear-Box Roller-Bearing Premature-Failure Caused by Grain-Boundary Hydrogen Embrittlement: A Multi-physics Computational Investigation, Journal of Materials Engineering and Performance, 23, 11, 2014. Crossref