Adiabatic shear in chip formation with negative rake angle

Ohbuchi, Yoshifumi; Obikawa, Toshiyuki

doi:10.1016/j.ijmecsci.2005.05.003

Cited by 42 publications

(22 citation statements)

References 9 publications

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“…Either damage model definition [13,15,[30][31][32] or strain softening consideration [9,[33][34][35][36] has been adopted in many investigations to reproduce material separation and shear bands localization within the chip thickness. In this paper and further to the JC plastic model definition, two distinct failure criteria are implemented is adopted where damage in the machined material is assumed to undergo two steps: (a) a failure initiation step (b) followed by its propagation up to the total fracture occurrence.…”

Section: Workpiece Materials Modelingmentioning

confidence: 99%

Numerical analysis of constitutive coefficients effects on FE simulation of the 2D orthogonal cutting process: application to the Ti6Al4V

Yaich

Ayed

Bouaziz

et al. 2016

Int J Adv Manuf Technol

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International audienceIn this paper, a deep study of constitutive parameters definition effect is done in order to guarantee sufficient reliability of the finite element machining modeling. The case of a particular biphasic titanium alloy Ti6Al4V known by its low machinability is investigated. The Johnson-Cook (JC) elasto-thermo-visco-plastic-damage model combined with the energy-based ductile fracture criteria is used. Segmentation frequency, chip curvature radius, shear band spacing, chip serration sensitivity and intensity, accumulated plastic strain in the formed chip segments, and cutting forces levels are determined where their dependency to every constitutive coefficient is examined and highlighted. It is demonstrated from the separate variation of every plastic and damage parameters that an interesting finite element modeling (FEM) relevance is reached with the adjustment of JC strain hardening coefficients term, thermal softening parameter, exponent fracture factor, and damage evolution energy. Moderate and high cutting speeds are applied to the cutting tool in the aim to test their impact on shear localization, chip segmentation, and numerical forces levels as well as to approve previous highlighted findings related to constitutive parameters definition. In general, this study focuses on a prominent decrease in identification process cost with the previous knowledge of the most affecting constitutive coefficients while keeping an interesting agreement between numerical and experimental results

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Section: Workpiece Materials Modelingmentioning

confidence: 99%

Numerical analysis of constitutive coefficients effects on FE simulation of the 2D orthogonal cutting process: application to the Ti6Al4V

Yaich

Ayed

Bouaziz

et al. 2016

Int J Adv Manuf Technol

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“…However, element distortion has been a matter of concern and has restricted the analysis to incipient chip formation or machining ductile materials using larger rake angles and/or low-friction conditions [11,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Pre-distorted meshes [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] or re-meshing have been used to minimize the problem. An alternative approach to simulate steady state chip formation using a Lagrangian formulation was proposed by Shirakashi (1974, 1982) [9,10].…”

Section: Solution Methodsmentioning

confidence: 99%

“…Similar approaches have been applied to simulate machining processes, such as defining an average friction coefficient over the rake face, separate coefficients for each region, different lengths for the sticking region, or even neglecting altogether the low stress variation of shear and normal stresses and simply assuming τ f = mτ Y (m < 1) along the rake face [17, 19- Other researchers attempted to use more realistic friction models. Experimental models were introduced by Usui and co-workers [9,10,[40][41][42]50], who used a non-linear stress expression to relate the normal stress and frictional stress as…”

Section: Friction Modelsmentioning

confidence: 99%

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Modelling and Simulation of Machining Processes

Vaz

Owen

Kalhori

et al. 2007

Arch Computat Methods Eng

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The modelling of metal cutting has proved to be particularly complex due to the diversity of physical phenomena involved, including thermo-mechanical coupling, contact/friction and material failure. The present work outlines the wide range of complex physical phenomena involved in the chip formation in a descriptive manner. In order to improve and understand the process different numerical strategies have been used for simulation. Several of these numerical strategies are reviewed and a short discussion of their relative merits and drawbacks is presented. By means of several examples, where a combined experimental/numerical effort was undertaken, we try to illustrate what numerical techniques, models and pertinent parameters are needed for successful simulations.

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“…It includes the Fig. 8 Change of specific cutting force affected by undeformed chip thickness effect of stagnant region (9), (13), (14) and adiabatic shear (10) caused in high-speed cutting with large negative rake angle. These deformations become different from the model Usui proposed.…”

Section: Evaluation Of Elastic Deformationmentioning

confidence: 99%

Surface Generation Model in Grinding with Effect of Grain Shape and Cutting Speed

Ohbuchi

Obikawa

2006

JSME Int. J., Ser. C

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To simulate cutting with abrasive grain in grinding, a random grain shape is modeled. The statistical distribution of the effective rake angles of abrasive grain is obtained by applying Usui's four models of kinematically admissible velocity fields. The material is removed in the case of complete chip or incomplete chip formation, but is not removed when wall of partial chip or plastic upheaval is generated. Next, residual stock removal by bulging, which occurs due to effect of cutting speed, is presumed. A critical undeformed chip thickness, under which chip forms with great difficulty, is introduced. For further strict modeling, three components of cutting force are evaluated. As a result, a new model of surface generation process in grinding considering upheaval or residual stock removal, which is caused by the effect of grain shape and cutting speed, and of elastic deformation, is proposed.

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Adiabatic shear in chip formation with negative rake angle

Cited by 42 publications

References 9 publications

Numerical analysis of constitutive coefficients effects on FE simulation of the 2D orthogonal cutting process: application to the Ti6Al4V

Numerical analysis of constitutive coefficients effects on FE simulation of the 2D orthogonal cutting process: application to the Ti6Al4V

Modelling and Simulation of Machining Processes

Surface Generation Model in Grinding with Effect of Grain Shape and Cutting Speed

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