Effect of surface roughness on friction coefficients during upsetting processes for different materials

Şahin, Mümin; Çetinarslan, Cem S.; Akata, H. Erol

doi:10.1016/j.matdes.2005.07.019

Cited by 68 publications

(33 citation statements)

References 12 publications

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“…Quanto maior a rugosidade, os picos são mais elevados e levam mais tempo para aderir na ferramenta, ocasionando melhor escoamento do material, o que leva a uma menor redução do diâmetro interno, ou seja, menor atrito. Esses resultados estão de acordo com os resultados apresentados por Sahin et al (2007).…”

Section: Resultsunclassified

“…A rugosidade é o conjunto de irregularidades, pequenas saliências (picos) e reentrâncias (vales) que caracterizam uma superfície, sendo uma maneira de descrever a qualidade superfi cial de uma peça acabada. Esta também infl uência diretamente na força de deslizamento, na resistência à corrosão e ao desgaste (Sahin et al, 2007).…”

Section: Introductionunclassified

“…Svahn et al (2003) investigaram a infl uên-cia da rugosidade superfi cial sobre o atrito e o desgaste por deslizamento de revestimentos de cromo e tungstênio aplicados em elementos de máquina. Sahin et al (2007) estudaram o efeito da rugosidade superfi cial em corpos de prova de diferentes materiais por intermédio do ensaio de compressão do anel entre matrizes planas.…”

Section: Introductionunclassified

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Estudo do efeito da rugosidade superficial sobre o coeficiente de atrito no ensaio de compressão do anel

Júnior

Margutti

Martins

et al. 2012

ete

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Resumo.A avaliação das condições tribológicas, dentre elas o atrito por meio de modelos simples é questionável porque a infl uência da rugosidade superfi cial e resistência de materiais, entre outros fatores, não é considerada. Este trabalho apresenta uma análise detalhada da infl uência da rugosidade superfi cial sobre o atrito na interface peça/matriz. Os estudos estão baseados em dados experimentais obtidos por meio do ensaio de compressão do anel, os quais foram comparados com os resultados de simulações e com as curvas de calibração de atrito modeladas em soft ware de elementos fi nitos. Uma série de ensaios de compressão do anel foi realizada para obter os coefi cientes de atrito para diversas faixas de rugosidade superfi cial do corpo de prova.Palavras-chave: ensaio de compressão do anel, rugosidade superfi cial, coefi ciente de atrito, simulação numérica.Abstract. The evaluation of the tribological conditions, among which the friction by means of simple models are questionable because the infl uence of superfi cial roughness and strength of materials, among other factors, is not considered. This paper presents a detailed analysis on the infl uence of surface roughness on friction at the specimen/die interface. The studies are based on experimental data obtained by the ring compression test, which they were compared with results of simulations and the calibration curves of friction modeled in fi nite element soft ware. A series of ring compression tests was performed to obtain the friction coeffi cient for various ranges of surface roughness of the specimen.

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Section: Resultsunclassified

Section: Introductionunclassified

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Estudo do efeito da rugosidade superficial sobre o coeficiente de atrito no ensaio de compressão do anel

Júnior

Margutti

Martins

et al. 2012

ete

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“…Up to now, large numbers of investigations have been carried out in sheet [4][5][6][7][8] and bulk [9][10][11][12][13][14][15][16] metal forming to evaluate interfacial friction and material deformed behavior. Wang et al have developed a plane-strain compression tribometer to measure friction and material ow-stress 2) .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Interfacial Friction and Inverse Flowing Behavior under the Adhesive State

2016

Mater. Trans.

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This paper has been retracted by the Editorial Committee of Mater. Trans. due to substantial overlap with the following paper previously published in another journal.Int J Adv Manuf Technol (2015) 79:255-263 Evaluation of rheological behavior and interfacial friction under the adhesive condition by upsetting method W.Q. Li Q.X. Ma (Received April 14, 2014; Accepted January 14, 2015; Published February 3, 2015) And thus, it shall not be regarded as an original paper.Materials Transactions, Vol. 58, No. 7 (2017) For improving the precision of numerical simulations in metal forming, it is critical to accurately evaluate the interfacial friction between die/specimen and material deformed behavior. However, there is a huge challenge to assess interfacial friction and material deformed behavior due to the complex mechanisms of tribology at the interfaces. In this study, a program of experimental work directed by ring upsetting has been carried out to evaluate interfacial friction and material deformed behavior on account of the speci c adhesive friction state. The behavior of adhesive friction was qualitatively identi ed with characterized phenomenon and quantitatively identi ed with friction coef cient, which was obtained by taking advantage of Boltzmann distribution characteristics between the radial velocity eld and the relative displacements relevant to metal particles on the meridian plane. Furthermore, simple mathematics methods were applied to analyze inverse owing behavior under the condition of adhesive friction based on the transients displacement achieved by ring upsetting. And the driven mechanism of inverse owing behavior was also revealed systematically. Finally, a new theory of bi-directionality theory was proposed to illustrate inverse owing behavior, and the sustainability of adhesive friction was synthetically analyzed.

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“…Cristino et al [9] and Sahin et al [10] both investigated the effect of changes in surface roughness in regard to the friction coefficient in ring upsetting tests with varying tribological pairs. It was found that friction is dependent on changes in the surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Evolution of the Surface Roughness in Dependence of the Lubrication System for Cold Forming Processes

et al. 2015

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Lubricants for cold forging operations do not only enable a reliable forging process, but also affect the results of forging processes. A sound lubrication decreases the occurring forces and may result in a smooth specimen surface. However, some lubricants are known to increase the initial surface roughness of the specimen as a consequence of the forming. Therefore, the decision which lubricant should be used is of special interest for near-net shape operations. The paper at hand presents the results of a finite element investigation of the first stage of an industrial rod extrusion process which was investigated with two different lubrication systems. The numerical investigations focus on a reliable prediction of the development of the surface roughness in due consideration of the lubricant.

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Effect of surface roughness on friction coefficients during upsetting processes for different materials

Cited by 68 publications

References 12 publications

Estudo do efeito da rugosidade superficial sobre o coeficiente de atrito no ensaio de compressão do anel

Estudo do efeito da rugosidade superficial sobre o coeficiente de atrito no ensaio de compressão do anel

Investigation of Interfacial Friction and Inverse Flowing Behavior under the Adhesive State

Prediction of the Evolution of the Surface Roughness in Dependence of the Lubrication System for Cold Forming Processes

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