The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
D V Lychagin - One of the best experts on this subject based on the ideXlab platform.
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macrosegmentation and strain hardening stages in copper single crystals under compression
International Journal of Plasticity, 2015Co-Authors: A. V. Chumaevskii, D V Lychagin, Yu S Tarasov, E. A. AlfyorovaAbstract:The surface deformation-induced pattern (relief) of copper single crystals with the orientation of the compression axis along [11¯1¯] has been investigated by means of optical, scanning electron and atomic force microscopy. The misorientations between both macroscopic and mesoscopic areas in [11¯1¯]-single crystals have been determined using the electron back scattering diffraction (EBSD) technique. The macroscopic reorientation has been revealed to rotate the crystalline lattice around the [110] axis. The single crystal has been divided into five macrosegments with their misorientations distributed along the compression axis in a manner that the deformation axis sequentially coincided with the crystallographic directions in the order [11¯1¯]-[22¯1¯]-[77¯3¯]-[11¯0]. Shear by unloaded Plane (11¯1¯) has been observed. The macrolevel deformation up to 25% has been developing as follows: shear by Octahedral Planes – development of macrobands – reorientation of the central zones – shear by unloaded Octahedral Plane in the reoriented zones. The steps of this sequence corresponded to the stages of the stress-strain curves.
E. A. Alfyorova - One of the best experts on this subject based on the ideXlab platform.
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macrosegmentation and strain hardening stages in copper single crystals under compression
International Journal of Plasticity, 2015Co-Authors: A. V. Chumaevskii, D V Lychagin, Yu S Tarasov, E. A. AlfyorovaAbstract:The surface deformation-induced pattern (relief) of copper single crystals with the orientation of the compression axis along [11¯1¯] has been investigated by means of optical, scanning electron and atomic force microscopy. The misorientations between both macroscopic and mesoscopic areas in [11¯1¯]-single crystals have been determined using the electron back scattering diffraction (EBSD) technique. The macroscopic reorientation has been revealed to rotate the crystalline lattice around the [110] axis. The single crystal has been divided into five macrosegments with their misorientations distributed along the compression axis in a manner that the deformation axis sequentially coincided with the crystallographic directions in the order [11¯1¯]-[22¯1¯]-[77¯3¯]-[11¯0]. Shear by unloaded Plane (11¯1¯) has been observed. The macrolevel deformation up to 25% has been developing as follows: shear by Octahedral Planes – development of macrobands – reorientation of the central zones – shear by unloaded Octahedral Plane in the reoriented zones. The steps of this sequence corresponded to the stages of the stress-strain curves.
A. V. Chumaevskii - One of the best experts on this subject based on the ideXlab platform.
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macrosegmentation and strain hardening stages in copper single crystals under compression
International Journal of Plasticity, 2015Co-Authors: A. V. Chumaevskii, D V Lychagin, Yu S Tarasov, E. A. AlfyorovaAbstract:The surface deformation-induced pattern (relief) of copper single crystals with the orientation of the compression axis along [11¯1¯] has been investigated by means of optical, scanning electron and atomic force microscopy. The misorientations between both macroscopic and mesoscopic areas in [11¯1¯]-single crystals have been determined using the electron back scattering diffraction (EBSD) technique. The macroscopic reorientation has been revealed to rotate the crystalline lattice around the [110] axis. The single crystal has been divided into five macrosegments with their misorientations distributed along the compression axis in a manner that the deformation axis sequentially coincided with the crystallographic directions in the order [11¯1¯]-[22¯1¯]-[77¯3¯]-[11¯0]. Shear by unloaded Plane (11¯1¯) has been observed. The macrolevel deformation up to 25% has been developing as follows: shear by Octahedral Planes – development of macrobands – reorientation of the central zones – shear by unloaded Octahedral Plane in the reoriented zones. The steps of this sequence corresponded to the stages of the stress-strain curves.
Yu S Tarasov - One of the best experts on this subject based on the ideXlab platform.
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macrosegmentation and strain hardening stages in copper single crystals under compression
International Journal of Plasticity, 2015Co-Authors: A. V. Chumaevskii, D V Lychagin, Yu S Tarasov, E. A. AlfyorovaAbstract:The surface deformation-induced pattern (relief) of copper single crystals with the orientation of the compression axis along [11¯1¯] has been investigated by means of optical, scanning electron and atomic force microscopy. The misorientations between both macroscopic and mesoscopic areas in [11¯1¯]-single crystals have been determined using the electron back scattering diffraction (EBSD) technique. The macroscopic reorientation has been revealed to rotate the crystalline lattice around the [110] axis. The single crystal has been divided into five macrosegments with their misorientations distributed along the compression axis in a manner that the deformation axis sequentially coincided with the crystallographic directions in the order [11¯1¯]-[22¯1¯]-[77¯3¯]-[11¯0]. Shear by unloaded Plane (11¯1¯) has been observed. The macrolevel deformation up to 25% has been developing as follows: shear by Octahedral Planes – development of macrobands – reorientation of the central zones – shear by unloaded Octahedral Plane in the reoriented zones. The steps of this sequence corresponded to the stages of the stress-strain curves.
Oana Cazacu - One of the best experts on this subject based on the ideXlab platform.
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new three dimensional strain rate potentials for isotropic porous metals role of the plastic flow of the matrix
International Journal of Plasticity, 2014Co-Authors: Benoit Revilbaudard, Oana CazacuAbstract:Abstract At present, modeling of the plastic response of porous solids is done using stress-based plastic potentials. To gain understanding of the combined effects of all invariants for general three-dimensional loadings, a strain-rate based approach appears more appropriate. In this paper, for the first time strain rate-based potentials for porous solids with Tresca and von Mises, matrices are obtained. The dilatational response is investigated for general 3-D conditions for both compressive and tensile states using rigorous upscaling methods. It is demonstrated that the presence of voids induces dependence on all invariants, the noteworthy result being the key role played by the plastic flow of the matrix on the dilatational response. If the matrix obeys the von Mises criterion, the shape of the cross-sections of the porous solid with the Octahedral Plane deviates slightly from a circle, and changes very little as the absolute value of the mean strain rate increases. However, if the matrix behavior is described by Tresca’s criterion, the shape of the cross-sections evolves from a regular hexagon to a smooth triangle with rounded corners. Furthermore, it is revealed that the couplings between invariants are very specific and depend strongly on the particularities of the plastic flow of the matrix.
