Effects of Ploughing Forces and Friction Coefficient in Microscale Machining

Venkatachalam, Siva; Liang, Steven Y.

doi:10.1115/1.2673449

Cited by 45 publications

(14 citation statements)

References 18 publications

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“…They concluded that Coulomb friction rule is valid during micro cutting regime and lower coefficient of friction values were calculated as a function of indentation depth during adhering stage. Venkatachalam and Liang [38] also studied the variation of coefficient of friction during microscale machining and stated that for low values of indentation, the coefficient of friction depends on the adhering effect. In this study, the material constitutive model was kept constant and friction models were investigated.…”

Section: Investigating the Influence Of Friction Models On Finite Elementioning

confidence: 99%

Investigating the influence of friction conditions on finite element simulation of microscale machining with the presence of built-up edge

Oliaei

2016

Int J Adv Manuf Technol

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In micromachining, the uncut chip thickness is less than the cutting tool edge radius, which results in a large negative effective rake angle. Depending on the material properties, this large negative rake angle promotes built-up edge (BUE) formation. A stable BUE acts like a cutting edge and affects the mechanics of the process. The size of the BUE increases with increasing uncut chip thickness and cutting speed. It also creates a positive rake angle, but it decreases the clearance angle of the tool. A method of including BUE formation in finite element simulations is to use sticking friction conditions at the tip of the tool. However, this approach is shown to be insufficient to simulate BUE formation in microscale machining. Therefore, the cutting edge is modified with the experimental BUE size in the finite element simulations based on experimental measurements. The influence of friction models between BUE and the work material has been investigated, and the study identifies friction coefficients that yield good agreements with experimental results. The finite element model is shown to be capable of simulating process forces and chip shapes for uncut chip thickness values larger than minimum uncut chip thickness.

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Section: Investigating the Influence Of Friction Models On Finite Elementioning

confidence: 99%

Investigating the influence of friction conditions on finite element simulation of microscale machining with the presence of built-up edge

Oliaei

2016

Int J Adv Manuf Technol

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“…The reason 0.63 3.9 9 10 À3 5.5 9 10 À5 SN2 0.62 2.2 9 10 À3 3.0 9 10 À5 SN3 0.64 3.0 9 10 À3 4.2 9 10 À5 SN4 0.59 6.0 9 10 À3 8.4 9 10 À5 SN5 0.63 9.8 9 10 À4 1.4 9 10 À5 SN6 0.60 2.1 9 10 À4 2.8 9 10 À6 SN7 0.61 5.3 9 10 À4 7.3 9 10 À6 SN8 0.62 3.9 9 10 À4 5.5 9 10 À6 for this was determined to be the extensive deformation due to the plowing action of the counterbody ball. [22] Plowing is defined as a plastic deformation process characterized by the displacement of asperities between the two interlocking surfaces. Apart from the central region of the wear scar, much less damage was seen on the worn surface of the flat materials.…”

Section: B the Sem Observations Of Worn Surfacesmentioning

confidence: 99%

Microstructure–Mechanical Properties–Wear Resistance Relationship of SiAlON Ceramics

Kumar

Açıkbaş

Kara

et al. 2009

Metall Mater Trans A

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In designing wear-resistant ceramics, it is important to understand the influence of the microstructure and material properties on friction and wear behavior. In addressing such issues, a series of fretting-wear tests was carried out on an important nonoxide engineering ceramic, i.e., SiAlON ceramics, densified using both pressureless and gas-pressure sintering routes. Under the selected operating conditions with a commercial SiAlON ball as a counterbody, tribomechanical wear assisted by deep abrasive grooves, plowing, grain pullout, and microcracking was observed as the major wear mechanism. In addition, the formation of a discontinuous silica-rich tribochemical layer on the worn surface was also observed. Although the steady-state coefficient of friction (COF) varies in a narrow window of 0.59 to 0.64, the wear rate of the investigated SiAlON ceramics lies in the range 7.3 9 10 À6 to 8.4 9 10 À5 mm 3 /NAEm. An attempt has been made to correlate wear loss with hardness and indentation toughness. Concerning the influence of the microstructure, the wear rate is found to have an inverse linear correlation with the b-SiAlON content. Another important observation has been that the wear rate has an inverse linear relationship with the substitution parameter (z).

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“…In the case of mechanical cause of friction, plowing of the surface by hard particles or asperities is mainly responsible for generating the frictional force. 2,4,[5][6][7] As for the chemical mechanism of friction, adhesion between surfaces of the two solids in contact is the cause of friction. 2,4,5,8 Another point to note is that tribological phenomena are heavily dependent on system parameters of the operating machine such as speed, temperature, load, and environment.…”

Section: Introductionmentioning

confidence: 99%

Nano-scale friction: A review

Kim

2009

Int. J. Precis. Eng. Manuf.

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Frictional force is a resistant force that must be overcome to achieve relative motion between two components in contact. The economical and technological benefits of controlling friction and wear are tremendous. However, due to the complex nature of the phenomena, clear understanding of the mechanisms are yet to be achieved, particularly at the nano-scale where surface forces tend to dominate the tribological behavior of the system. In this paper the results of numerous theoretical, experimental, and numerical works on the fundamental mechanisms of friction at the nano-scale are reviewed. It is shown that friction coefficient values for nano-scale systems are quite varied depending on the conditions under which the system is investigated. As for the mechanism that causes friction at the nano-scale, interaction of the atoms plays a vital role. Furthermore, factors such as atomic radius, interatomic potential energy, and lattice parameters contribute to the degree of atomic interaction.

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Effects of Ploughing Forces and Friction Coefficient in Microscale Machining

Cited by 45 publications

References 18 publications

Investigating the influence of friction conditions on finite element simulation of microscale machining with the presence of built-up edge

Investigating the influence of friction conditions on finite element simulation of microscale machining with the presence of built-up edge

Microstructure–Mechanical Properties–Wear Resistance Relationship of SiAlON Ceramics

Nano-scale friction: A review

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