Friction in micromanufacturing

Dixit, Uday S.; Yadav, Vinod; Narayanan, R. Ganesh; Bhardwaj, Nidhi

doi:10.1177/2516598418766918

Cited by 9 publications

(5 citation statements)

References 102 publications

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“…Two widely used models of friction in metal forming are Amontons-Coulomb model, in which the frictional shear stress is considered proportional to normal stress and constant friction or Tresca model, in which frictional shear stress is assumed to be proportional to yield shear strength of the material [2]. The ratio of yield shear strength to frictional shear stress is often denoted by m and is known as the friction factor.…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

Determining Friction and Flow Stress of Material during Forging

Dixit¹,

Kumar²,

Петров³

et al. 2021

Esaform 2021

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Determination of flow stress and friction in cold forging is of paramount importance. In this work, an inverse procedure is developed for predicting the Coulomb’s coefficient of friction and strain-dependent flow stress simultaneously based on the measurement of bulge and forging load. It is also established that in cold forging Coulomb’s coefficient of friction can be approximated as half the friction factor in Tresca (or constant friction) model. In the inverse procedure, forging load is estimated analytically but bulging is estimated by developing an empirical relation. The efficacy of the inverse procedure is ascertained by the data obtained from finite element method simulations. Finite element method was implemented in ABAQUS and validated with the results available in literature. In most of the cases, inverse procedure provides less than 5% error in the estimates of friction and flow stress. A sensitivity analysis is also carried out to study the effect of measurement error. It is observed that error in the estimation of friction is proportional to error in the measurement of bulge. The novelty of the method lies in the quickness and simplicity of the method.

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Section: Intr Introduction Oductionmentioning

confidence: 99%

Determining Friction and Flow Stress of Material during Forging

Dixit¹,

Kumar²,

Петров³

et al. 2021

Esaform 2021

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“…A variable coefficient of friction related to sticking and sliding regimes in the secondary deformation zone was employed, while researchers often used an equivalent Coulomb’s coefficient of friction. 2–4, 6, 36 The effect of velocity on friction is not considered here. The value of the coefficient of friction was based on the experimental results reported by Sharma and Pandey.…”

Section: Finite Element Modelmentioning

confidence: 99%

Finite element simulations of conventional and ultrasonically assisted turning processes with plane and textured cutting inserts

Sharma

Pandey

Dixit

et al. 2019

Journal of Micromanufacturing

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This paper investigates the performance of conventional turning and ultrasonically assisted turning (UAT) processes with plane and textured cutting inserts. Simulations based on the finite-element method were carried out using a software package ABAQUS/Explicit (Dassault Systemes, France). The obtained results were validated experimentally by employing a specially developed UAT setup. The purpose of the paper is to analyze cutting-force variation by the use of textured cutting inserts. Optimized dimensions of the texture pattern were used to model textured cutting inserts. The cutting-force variation in UAT was assessed with finite-element method, confirming diminishing cutting forces at a tool–workpiece interface during a noncontact time. The use of the textured cutting inserts in the UAT process resulted in the lowest cutting forces when compared to a plane tool in UAT as well as both plane and textured tools in the conventional turning process.

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“…Achieving effective control of friction in manufacturing processes is largely driven by the development of new lubricants and friction control methods. While minimizing friction (and thus energy loss and wear) continues to be a fundamental requirement for the manufacturing industry, environmental friendliness of lubricants is emerging as a key consideration because the commonly used oil-based lubricants and additives generate pollutants. − Friction control at micro/nanoscale contacts is also crucial in determining the quality and functionalities of microscale products. − Furthermore, in ultrahigh precision manufacturing, dynamic control of friction is critical for precision motion control and thus product quality. − …”

Section: Introductionmentioning

confidence: 99%

Surface Curvature Enhances the Electrotunability of Ionic Liquid Lubrication

Zheng,

Hawthorne,

Batteas

et al. 2024

Langmuir

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Ionic liquids (ILs) are a promising class of lubricants that allow dynamic friction control at electrified interfaces. In the real world, surfaces inevitably exhibit some degree of roughness, which can influence lubrication. In this work, we deposited single-layer graphene onto 20 nm silica nanoparticle films to investigate the effect of surface curvature and electrostatic potential on both the lubricious behavior and interfacial layering s t r u c t u r e o f 1 -e t h y l -3 -m e t h y l i m i d a z o l i u m b i s -(trifluoromethylsulfonyl)imide on graphene. Normal force and friction force measurements were conducted by atomic force microscopy using a sharp silicon tip. Our results reveal that the friction coefficient at the lubricated tip−graphene contacts significantly depends on surface curvature. Two friction coefficients are measured on graphene peaks and valleys with a higher coefficient measured at lower loads (pressures), whereas only one friction coefficient is measured on smooth graphene. Moreover, the electrotunability of the friction coefficient at low loads is observed to be significantly enhanced in peaks and valleys compared with smooth graphene. This is associated with the promoted overscreening of surface charge on convex interfaces and the steric hindrance at concave interfaces, which leads to more layers of ions (electrostatically) bound to the surface, i.e., thicker boundary films (electrical double layers). This work opens new avenues to control IL lubrication on the nanoscale by combining topographic features and an electric field.

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Friction in micromanufacturing

Cited by 9 publications

References 102 publications

Determining Friction and Flow Stress of Material during Forging

Determining Friction and Flow Stress of Material during Forging

Finite element simulations of conventional and ultrasonically assisted turning processes with plane and textured cutting inserts

Surface Curvature Enhances the Electrotunability of Ionic Liquid Lubrication

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