Abstract
In latest years small scale machining has been widely used in advanced engineering applications such as medical and optical devices, micro- and nano-electro-mechanical systems. In micromachining of metals, a depth of cut becomes usually smaller than an average crystal size of a polycrystalline structure; thus, the cutting process zone can be localized fully indoors of a single grain. Due to the crystallographic anisotropy, development of small scale machining models accounting for crystal plasticity are essential for a precise calculation of material removal under such circumstances. For this purpose, a 3D finite-element model of micro-cutting of a single grain was developed. A crystal-plasticity theory accounting for gradients of strain, implemented in ABAQUS/Explicit via a user-defined material subroutine VUMAT, was used in the computations. The deformation-induced lattice rotations in micro-cutting of a single crystal were analyzed extensively.
Highlights
In latest years small scale machining has become popular in manufacturing of components with sizes of submillimeter or smaller used in advanced engineering applications such as medical and optical devices, microand nano-electro-mechanical systems
Since single crystals are strongly anisotropic in their mechanical behaviour, the cutting process naturally depends on crystallographic orientation as well as slip system and slip activity in single grain (Lee et al, 2000)
Γ0̇α is the reference strain rate, τα is the resolved shear stress, n is the material constant related to its ratesensitivity, gTα represents the strength of the slip system α at the instant time, and sgn(Γ) is the signum function of Γ
Summary
In latest years small scale machining has become popular in manufacturing of components with sizes of submillimeter or smaller used in advanced engineering applications such as medical and optical devices, microand nano-electro-mechanical systems. Demiral et al / Challenge Journal of Structural Mechanics 7 (3) (2021) 117–122 et al (2014a) investigated the effect of grain orientation on the behavior of a single crystal using a FE model incorporating the strain-gradient and crystal plasticity in the constitutive equations. The role of strain gradients due to inhomogeneous plastic deformation in small scales on the response of the structure cannot be ignored; they are considered in the constitutive equations. Their effects on the spin of the crystalline lattice and resulting deformation patterns are presented.
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