A physically based constitutive model for simulation of segmented chip formation in orthogonal cutting of commercially pure titanium

Melkote, Shreyes N.; Liu, Rui; Fernandez-Zelaia, Patxi; Marusich, Troy D.

doi:10.1016/j.cirp.2015.04.060

Cited by 81 publications

(29 citation statements)

References 19 publications

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“…Guo et al [103] [146] and segmented chip formation in pure titanium [159]. In their model, the flow stress is a function of microstructure, which is described by the evolution of the dislocation density and the mean grain size.…”

Section: Model Pros and Consmentioning

confidence: 99%

“…The work of Childs and Rahmad [56] also highlights the importance of including the correct deformation physics in the constitutive model to ensure the accuracy of cutting simulations. In the absence of a damage evolution model, Melkote et al [159] showed that an inverse Hall-Petch effect must be included in the constitutive model to capture shear bands formed in the cutting of pure titanium. This need is supported by evidence of severe grain refinement in titanium chips [205].…”

Section: Critical Assessment Of Materials Behaviour and Constitutive Mmentioning

confidence: 99%

“…The effects of dislocation drag, dynamic recovery, and dynamic recrystallization are also considered. Below a critical grain size, an inverse Hall-Petch effect, attributed to grain boundary sliding, is included in the model to simulate segmented chip formation [159]. Fig.…”

Section: Model Pros and Consmentioning

confidence: 99%

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Advances in material and friction data for modelling of metal machining

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Section: Model Pros and Consmentioning

confidence: 99%

Section: Critical Assessment Of Materials Behaviour and Constitutive Mmentioning

confidence: 99%

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Advances in material and friction data for modelling of metal machining

et al. 2017

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“…A proper constitutive model is the significant factor for the simulation of microstructure. The predicted models used in the literature can be divided into two categories of physically based (such as dislocation and slip) grain refinement models [11] and empirical-analytical models [12]. The internal variables of physically based models directly relate to the density and dynamics of dislocations.…”

Section: Introductionmentioning

confidence: 99%

Evolutions of grain size and micro-hardness during chip formation and machined surface generation for Ti-6Al-4V in high-speed machining

Wang

et al. 2015

Int J Adv Manuf Technol

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Machined surface with ultrafine grained microstructure can be obtained through severe plastic deformation in high-speed machining (HSM) process. The aim of this paper is to investigate the evolution of grain size and microhardness during HSM of Ti-6Al-4V alloy using the finite element method (FEM) and user subroutine VUSDFLD of Abaqus/Explicit. Firstly, a FE model to simulate the cutting process of Ti-6Al-4V is proposed. The proposed cutting simulation model is verified by high-speed machining experiments in terms of cutting force and chip morphology. Secondly, a novel user subroutine VUSDFLD based on equations of Zener-Hollomon and Hall-Petch is developed to simulate the modifications of grain size and micro-hardness in chip formation and machined surface generation under different cutting speeds. Parameters in the equations of Zener-Hollomon and Hall-Petch are modified for Ti-6Al-4V for simulation of the change of grain size and micro-hardness during HSM. Lastly, the simulation results of the microstructure evolution in chips and machined surfaces are compared with experimental results obtained by optical microscopy, scanning electron microscopy (SEM), and measurement of micro-hardness. The comparison results show that the evolution of grain size and micro-hardness of Ti-6Al-4V in HSM can be accurately predicted by the modified Zener-Hollomon and Hall-Petch equations. This research indicates that smaller grain sizes are produced into both chips and machined surfaces due to more severe deformations with increasing of the cutting speed. The findings validate that HSM is a reliable approach to generate refined grains if proper machining parameters are selected. HSM can also be applied as a novel material test method to study the relationship between microstructure evolution and deformation parameters.

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“…Research on chip formation was performed since a half century ago [7], but new technologies related to computers development, both hardware and software, allow today greater possibilities to perform this research [5][6]8].…”

Section: Introductionmentioning

confidence: 99%

Superficial hardened layer of cut surface by turning

Croitoru¹,

Voiculescu²,

Trușcă³

2017

MATEC Web Conf.

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Abstract.One of research methods in metal cutting process is to measure hardness in the contact zone between cutting tool and workpiece. The objective of the performed research was to determine thickness and hardness of the superficial layer of cut surface due to cutting process, both orthogonal and complex cutting. The most important finding was that thickness of the superficial hardened layer is very thin under considered conditions, less than 0.01 … 0.02 mm. This research should be continued.

show abstract

A physically based constitutive model for simulation of segmented chip formation in orthogonal cutting of commercially pure titanium

Cited by 81 publications

References 19 publications

Advances in material and friction data for modelling of metal machining

Advances in material and friction data for modelling of metal machining

Evolutions of grain size and micro-hardness during chip formation and machined surface generation for Ti-6Al-4V in high-speed machining

Superficial hardened layer of cut surface by turning

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