Strain-gradient crystal-plasticity modelling of micro-cutting of b.c.c. single crystal

Demiral, Murat; Roy, Anish; Silberschmidt, Vadim V.

doi:10.1007/s11012-015-0280-3

Cited by 12 publications

(3 citation statements)

References 26 publications

(7 reference statements)

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“…Furthermore, the difference in terms of the active slip systems for different cutting directions affected chip morphology as observed in Fig. 2 (Demiral et al, 2014a;2016).…”

Section: Table 3 Orientations CD ([Abc]) and Cp ([Def])mentioning

confidence: 96%

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A numerical study on influence of strain gradients on lattice rotation in micro-machining of a single crystal

Demiral¹,

Roy²,

Silberschmidt³

2021

CJSMEC

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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.

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“…Furthermore, the difference in terms of the active slip systems for different cutting directions affected chip morphology as observed in Fig. 2 (Demiral et al, 2014a;2016).…”

Section: Table 3 Orientations CD ([Abc]) and Cp ([Def])mentioning

confidence: 96%

“…In an enhanced model of crystal-plasticity (EMCP), ∆𝑔 𝐺 𝛼 disappears as it does not consider the evolving GNDs. The models were implemented in the FE software ABAQUS/Explicit via the userdefined material subroutine (VUMAT) (Demiral et al, 2016).…”

Section: 𝐹 = 𝐹 𝑒 𝐹 𝑝mentioning

confidence: 99%

A numerical study on influence of strain gradients on lattice rotation in micro-machining of a single crystal

Demiral¹,

Roy²,

Silberschmidt³

2021

CJSMEC

Self Cite

View full text Add to dashboard Cite

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“…These problems are severely relevant to manufacturing process simulations because the material is heavily deformed in a short amount of time, thus inducing deformation localization and thermal softening. Moreover, it was already demonstrated that a strong size effect characterizes some manufacturing processes and that the classical continuum mechanics was no longer adequate to predict these behaviors [7,16,24,31,44].…”

Section: Introductionmentioning

confidence: 99%

Regularization of shear banding and prediction of size effects in manufacturing operations: A micromorphic plasticity explicit scheme

et al. 2022

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Good quality manufacturing operation simulations are essential to obtain reliable numerical predictions of the processes. In many cases, it is possible to observe that the deformation localizes in narrow areas, and since the primary deformation mode is under shear, these areas are called shear bands. In classical continuum mechanics models, the deformation localization may lead to spurious mesh dependency if the material locally experiences thermal or plastic strain softening. One option to regularize such a non-physical behavior is to resort to non-local continuum mechanics theories. This paper adopts a scalar micromorphic approach, which includes a characteristic length scale in the constitutive framework to enforce the plastic strain gradient theory to regularize the solution. Since many manufacturing process simulations are often assessed through finite element methods with an explicit solver to facilitate convergence, we present an original model formulation and procedure for the implementation of the micromorphic continuum in an explicit finite element code. The approach is illustrated in the case of the VPS explicit solver from ESI GROUP. According to the original formulation, we propose an easy way to implement a scalar micromorphic approach by taking advantage of an analogy with the thermal balance equation. The numerical implementation is verified against the analytical solution of a semi-infinite glide problem. Finally, the correctness of the method is addressed by successfully predicting size effects both in a cutting and a bending tests.

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A new model for permanent flexural deflection of cantilever MEMS actuator by conventional mechanism-based strain gradient plasticity framework

Darvishvand

Zajkani

2019

Microsyst Technol

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Strain-gradient crystal-plasticity modelling of micro-cutting of b.c.c. single crystal

Cited by 12 publications

References 26 publications

A numerical study on influence of strain gradients on lattice rotation in micro-machining of a single crystal

A numerical study on influence of strain gradients on lattice rotation in micro-machining of a single crystal

Regularization of shear banding and prediction of size effects in manufacturing operations: A micromorphic plasticity explicit scheme

A new model for permanent flexural deflection of cantilever MEMS actuator by conventional mechanism-based strain gradient plasticity framework

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