A Nonlocal Phenomenological Anisotropic Finite Deformation Plasticity Model Accounting for Dislocation Defects  

Oleh:

Regueiro, Richard A. ; Garikipati, Krishna ; Bammann, Douglas J. ; Marin, Esteban B.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Engineering Materials and Technology vol. 124 no. 3 (2002), page 380-387.
Topik: ACCOUNTING; non local; phenomenological; anisotropic; finite deformation; plasticity; accounting; dislocation

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ87.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

A phenomenological, polycrystalline version of a nonlocal crystal plasticity model is formulated. The presence of geometrically necessary dislocations (GNDs) at, or near, grain boundaries is modeled as elastic lattice curvature through a curl of the elastic part of the deformation gradient. This spatial gradient of an internal state variable introduces a length scale, turning the local form of the model, an ordinary differential equation (ODE), into a nonlocal form, a partial differential equation (PDE) requiring boundary conditions. Small lattice elastic stretching results from the presence of dislocations and from macroscopic external loading. Finite deformation results from large plastic slip and large rotations. The thermodynamics and constitutive assumptions are written in the intermediate configuration in order to place the plasticity equations in the proper configuration for finite deformation analysis.

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