The role of nonuniform particle distribution in plastic flow localization
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A possibility study on plasma-assisted synthesis of hybrid multi-scale Al-(Al<inf>2</inf>O<inf>3</inf>+Al<inf>x</inf>Ti<inf>y</inf>) nanocomposite coatings for wear resistance applications: A look at microstructure evolution mechanism
2023, Surface and Coatings TechnologyCitation Excerpt :The formation of this microstructure is resultant of the interactional effects of several influential factors associated with the preparation and spark plasma sintering of the hybrid powder, including compositional and morphological inhomogeneity in the ball-milled hybrid powder, spark discharge, electric field-enhanced diffusion, Joule heating, plastic deformation before heating, development of temperature gradients throughout the specimen, and plasma-assisted local plastic flow [81–83]. At the beginning of the sintering process, the hybrid composite particles experience a heterogeneous and localized plastic flow due to the nonuniform particle distribution in size and position [84]. Over time and temperature, the development of superficially localized melting and thermal gradients throughout the compact leads to the formation of a heterogeneous thermal map.
Failure of Metals
2023, Comprehensive Structural IntegrityDynamic spherical cavity expansion in Gurson materials with uniform and non-uniform distributions of porosity
2019, Mechanics of MaterialsCitation Excerpt :The finite element calculations also show that the steady-state expansion of the cavity is reached in few microseconds (for the highest cavitation velocity considered), thus verifying the assumption of steady cavitation fields used in the theoretical model. In addition to the finite element simulations used to validate the theoretical model (which assumes that the initial porosity is uniformly distributed in the material), we have performed numerical calculations with non-uniform distributions of initial porosity that aim at idealizing the micro-structure of metallic materials with inclusions and second-phase particles randomly distributed in the bulk (Ohno and Hutchinson, 1984; Becker, 1987; Huang, 1993; Bilger et al., 2007). These numerical calculations show that the distribution of porosity has small influence on the cavitation velocity, as well as on the location of the shock wave, which are primarily determined by the average material properties.
Porous plasticity: Predictive second moment homogenization models coupled with Gurson's single cavity stress-strain solution
2018, International Journal of PlasticityCitation Excerpt :All the cited works idealize the material's microstructure by considering periodically distributed voids. Multi-pore models that take into account the nonuniform distribution of the voids were considered by Huang (1993),Thomson et al. (2003). Fast Fourier Transformation (FFT) method was also used by Bilger et al. (2005) and Bilger et al. (2007) to investigate the effect of porosity fluctuation inside the RVE on the overall yield surface of the voided materials.
Ductilization of aluminium alloy 6056 by friction stir processing
2017, Acta Materialia