In this study, a novel approach to modeling the ultrasonic softening effect during metal plasticity is developed, where slip systems experience differential depending on their orientation relative direction. The directional model was implemented within Visco-Plastic Self-Consistent (VPSC) model, material and parameters are calibrated based micro-tensile test data of pure copper with tension alo...

The forming limit diagrams (FLDs) characterizing the formability of sheet metals are usually obtained by applying proportional loadings. Nevertheless, industrial processes involve strain path changes that can modify limit-strain values. In addition, for strongly anisotropic such as Zn-Cu-Ti zinc alloy, large differences in curves (FLCs) with respect to rolling direction observed. present work, ...

Constitutive equations for the multiaxial stress-strain behavior of aluminum alloy 5754 sheets were developed, based on crystal plasticity. A Taylor-based polycrystal plasticity model, a tangent formulation of the self-consistent viscoplastic model (VPSC), and an N-site viscoplastic model based on the fast Fourier transform (VPFFT) were used to fit a single slip system hardening law to the avai...

Parsing the effect of slip-twin interactions on strain rate and thermal sensitivities Magnesium (Mg) alloys has been a challenging endeavor for scientists preoccupied with mechanical behavior hexagonal close-packed alloys, especially those great latent economic potential such as Mg. One main barriers is travail entailed in fitting various stress−strain behaviors at different temperatures, rates...

The residual strain determination by neutron diffraction has been performed on a set of five natural quartzite samples collected from Betic Cordilleras (Spain) and Sivas Basin (Turkey). starting idea was to document an earlier conclusion about the texture components related either deformation or recrystallization phenomena. Thereafter, as consequence rock inhomogeneity, complete tensor determin...

In this study, the texture evolutions of two Mg materials during tension are explored. In-situ X-ray synchrotron and Visco-Plastic Self-Consistent (VPSC) modeling employed to investigate different deformation modes between pure Mg–15Gd (wt.%) alloy. These with a strong extrusion show large slip/twinning activity behaviors tensile deformation. The basal ?a? slip has highest contribution initial ...

We studied the role of nitrogen content on the stress-strain response of Hadfield steel (HS) single crystals under compressive loading. Two different nitrogen concentrations were examined for each orientation (0.05 wt pct and 1.06 wt pct) with drastic increase in critical resolved shear stresses (CRSSs) and strain-hardening coefficients compared to HS without nitrogen. The stress-strain respons...

The deformation mechanism and texture evolution of AZ31 Mg alloy compressed in three different directions at room temperature were studied, the relationship between two was compared through experiments viscoplastic self-consistent (VPSC) modeling. Setting up only one specific mode predominant by changing CRSS ratio for modes. following conclusions drawn: (1) It demonstrated that basal slip caus...

Membrane microdomains are assembled by lipid partitioning (e.g., rafts) or by protein-protein interactions (e.g., coated vesicles). During docking, yeast vacuoles assemble "vertex" ring-shaped microdomains around the periphery of their apposed membranes. Vertices are selectively enriched in the Rab GTPase Ypt7p, the homotypic fusion and vacuole protein sorting complex (HOPS)-VpsC Rab effector c...