TY  - JOUR
A1  - Sevostianov, Igor
A1  - Bruno, Giovanni
T1  - Maxwell scheme for internal stresses in multiphase composites
JF  - Mechanics of Materials
N2  - The paper focuses on the reformulation of classic Maxwell's (1873) homogenization method for calculation of the residual stresses in matrix composites. For this goal, we equate the far fields produced by a set of inhomogeneities subjected to known eigenstrains and by a fictitious domain with unknown eigenstrain. The effect of interaction between the inhomogeneities is reduced to the calculation of the additional field acting on an inhomogeneity due to the eigenstrains in its neighbors. An explicit formula for residual stresses is derived for the general case of a multiphase composite. The method is illustrated by several examples. The results are compared with available experimental data as well as with predictions provided by the non-interaction approximation (Eshelby solution). It is shown that accounting for interaction can explain many experimentally observed phenomena and is required for adequate quantitative analytical modeling of the residual stresses in matrix composites.
KW  - Residual stress
KW  - Multiphase composites
KW  - Interaction
KW  - Micromechanical schemes
KW  - Anisotropy
Y1  - 2018
U6  - https://doi.org/10.1016/j.mechmat.2018.12.005
SN  - 0167-6636
SN  - 1872-7743
VL  - 129
SP  - 320
EP  - 331
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Evsevleev, Sergei
A1  - Mishurova, Tatiana
A1  - Cabeza, Sandra
A1  - Koos, R.
A1  - Sevostianov, Igor
A1  - Garcés, Gonzales
A1  - Requena, Guillermo
A1  - Fernandez, R.
A1  - Bruno, Giovanni
T1  - The role of intermetallics in stress partitioning and damage evolution of AlSil2CuMgNi alloy
JF  - Materials Science and Engineering: A-Structural materials: properties, microstructure and processing
N2  - Load partitioning between phases in a cast AlSi12CuMgNi alloy was investigated by in-situ compression test during neutron diffraction experiments. Computed tomography (CT) was used to determine volume fractions of eutectic Si and intermetallic (IM) phases, and to assess internal damage after ex-situ compression tests. The CT reconstructed volumes showed the interconnectivity of IM phases, which build a 3D network together with eutectic Si. Large stresses were found in IMs, revealing their significant role as a reinforcement for the alloy. An existing micromechanical model based on Maxwell scheme was extended to the present case, assuming the alloy as a three-phase composite (Al matrix, eutectic Si, IM phases). The model agrees well with the experimental data. Moreover, it allows predicting the principal stresses in each phase, while experiments can only determine stress differences between the axial and radial sample directions. Finally, we showed that the addition of alloying elements not only allowed developing a 3D interconnected network, but also improved the strength of the Al matrix, and the ability of the alloy constituents to bear mechanical load.
KW  - Aluminum alloys
KW  - Neutron diffraction
KW  - Micromechanical modeling
KW  - Internal stress
KW  - Damage
KW  - Computed tomography
Y1  - 2018
U6  - https://doi.org/10.1016/j.msea.2018.08.070
SN  - 0921-5093
SN  - 1873-4936
VL  - 736
SP  - 453
EP  - 464
PB  - Elsevier
CY  - Lausanne
ER  - 
TY  - JOUR
A1  - Bruno, Giovanni
A1  - Kachanov, Mark
A1  - Sevostianov, Igor
A1  - Shyam, Amit
T1  - Micromechanical modeling of non-linear stress-strain behavior of polycrystalline microcracked materials under tension
JF  - Acta materialia
N2  - The stress-strain behavior of microcracked polycrystalline materials (such as ceramics or rocks) under conditions of tensile, displacement-controlled, loading is discussed. Micromechanical explanation and modeling of the basic features, such as non-linearity and hysteresis in stress-strain curves, is developed, with stable microcrack propagation and "roughness" of intergranular cracks playing critical roles. Experiments involving complex loading histories were done on large- and medium grain size beta-eucryptite ceramic. The model is shown to reproduce the basic features of the observed stress-strain curves. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KW  - Nonlinearity
KW  - Stress-strain relations
KW  - Hysteresis
KW  - Tension
KW  - Ceramics
KW  - Rocks
KW  - Polycrystals
Y1  - 2018
U6  - https://doi.org/10.1016/j.actamat.2018.10.024
SN  - 1359-6454
SN  - 1873-2453
VL  - 164
SP  - 50
EP  - 59
PB  - Elsevier
CY  - Oxford
ER  -