The research works of Coulomb and Amontons and generalized laws of friction

Popova, E. I.; Popov, Valentin L.

doi:10.1007/s40544-015-0074-6

Cited by 158 publications

(106 citation statements)

References 19 publications

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“…It had already been discussed in a similar form before Derjaguin [33], also by Coulomb himself [42]. What he proposed was a fracture criterion for granular and brittle materials, known as the Mohr-or Navier-Coulomb criterion, respectively [29,83]. Besides, Tabor [109] used Eq.…”

Section: Adhesive and Non-adhesive Frictionmentioning

confidence: 97%

Continuum contact models for coupled adhesion and friction

Mergel

Sahli

Scheibert

et al. 2018

The Journal of Adhesion

148

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We develop two new continuum contact models for coupled adhesion and friction, and discuss them in the context of existing models proposed in the literature. Our new models are able to describe sliding friction even under tensile normal forces, which seems reasonable for certain adhesion mechanisms. In contrast, existing continuum models for combined adhesion and friction typically include sliding friction only if local contact stresses are compressive. Although such models work well for structures with sufficiently strong local compression, they fail to capture sliding friction for soft and compliant systems (like adhesive pads), for which the resistance to bending is low. This can be overcome with our new models. For further motivation, we additionally present experimental results for the onset of sliding of a smooth glass plate on a smooth elastomer cap under low normal loads. As shown, the findings from these experiments agree well with the results from our models. In this paper we focus on the motivation and derivation of our continuum contact models, and provide a corresponding literature survey. Their implementation in a nonlinear finite element framework as well as the algorithmic treatment of adhesion and friction will be discussed in future work.

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Section: Adhesive and Non-adhesive Frictionmentioning

confidence: 97%

Continuum contact models for coupled adhesion and friction

Mergel

Sahli

Scheibert

et al. 2018

The Journal of Adhesion

148

View full text Add to dashboard Cite

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“…Tetapi umumnya, gaya gesek yang dipelajari di sekolah menengah dan tingkat awal perguruan tinggi adalah gaya gesek yang memenuhi model yang diajukan oleh Coulomb dan Amontons (Popova & Popov, 2015). Dalam model tersebut dinyatakan bahwa: (1) besar gaya gesek bergantung pada berat benda (atau gaya normal), (2) besar gaya gesek tidak bergantung pada luas permukaan kontak, dan (3) gaya gesek kinetis tidak bergantung pada kecepatan.…”

Section: Pendahuluanunclassified

Miskonsepsi gaya gesek pada mahasiswa

Tiandho

2018

J. Pendidik. Fis. Keilmuan

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AbstrakPada makalah ini dilakukan evaluasi pemahaman mahasiswa tingkat awal terkait konsep gaya gesek yang telah mereka pelajari ketika di sekolah menengah atas. Berdasarkan pengujian awal dapat diketahui bahwa kebanyakan mahasiswa masih mengalami miskonsepsi terkait konsep gaya gesek, khususnya dalam konsep gaya gesek statis. Tingginya miskonsepsi mahasiswa terkait gaya gesek statis disebabkan oleh banyaknya literatur yang merumuskan gaya gesek statis secara tidak tepat yaitu sebagai perkalian dari koefisien gesek statis dengan gaya normalnya yang bernilai konstan. Selain itu, ungkapan matematis dari gaya gesek statis yang menggunakan simbol ketidaksamaan meningkatkan potensi miskonsepsi karena dirasa lebih sulit oleh mahasiswa seperti dinyatakan dalam penelitian Handhika, et al. (2015). Melalui pengajaran dengan rumusan gaya gesek statis yang benar menggunakan metode analogi, mahasiswa dapat memahami konsep gaya gesek dan implikasinya secara lebih baik dari sebelumnya. Sehingga dari penelitian ini diharapkan guru menggunakan buku teks yang memberikan deskripsi yang benar tentang gaya gesek. Handhika et al. (2015). Through lectures with use right formulation of the static frictional forces by using analogical method, the students can understand the frictional forces concepts and its implication better than ever. So from this research is expected to teachers use textbook which give right description about frictional force. Keywords: alalogy; classical mechanics; frictional forces; misconception _____________________________________________________________________________ PENDAHULUANMiskonsepsi atau kadang disebut dengan konsepsi alternatif merupakan suatu struktur kognitif yang dipegang teguh tetapi berbeda dengan pemahaman konsep yang sesungguhnya (menurut para ahli) dan mungkin saja dapat ikut mengontaminasi ketika dilakukan konstruksi pengetahuan baru (Hammer, 1996). Miskonsepsi berbeda dengan kekurangpahaman (preconception) terhadap suatu konsep atau pembelajaran karena kekurangpahaman dapat diatasi dengan instruksi dan pembelajaran selanjutnya.Kekurangpahaman dapat dipandang sebagai suatu "gagasan sebelum instruksi". Miskonsepsi dapat terjadi karena berbagai macam hal diantaranya: intuisi yang

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“…Assuming a rectangular shape of the rigid body and taking into account (32), the ratio of the rotational inertia 7 κ results to:…”

Section: Influence Of the Parametersmentioning

confidence: 99%

The Influence of System Dynamics on the Frictional Resistance: Insights from a Discrete Model

Wetter

Popov

2016

Tribol Lett

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In order to examine the influence of system dynamics on sliding friction, we introduce the so-called microwalking machine. This model consists of a rigid body with a number of elastic contact spots that is pulled by a constantly moving base. The system slides with dry friction on a rigid substrate. The kinematic coupling of the rotation and the translation of the rigid body results in varying normal and tangential forces at the contact spots. For certain parameter ranges this leads to self-excited oscillations in the vertical direction. A particular dynamic mode occurs which is characterized by a strong correlation between low or even zero normal forces and a fast forward motion. This effect is referred to as micro-walking. In addition to an experimental rig we use numerical integration and an extensive parameter study for the analysis. In theory, the reduction of the frictional resistance reaches up to 98%. These results are confirmed by the experiments where the maximal reduction was 73%.Our model shows that micro-vibrations play an important role for the dynamic influences on the frictional resistance of systems that exhibit apparently smooth sliding. The identification of the critical parameter range enables the systematic control of frictional resistance through the adjustment of attributes such as geometry and stiffness. In addition, it is possible to deduce guidelines for how tribological test rigs should be designed in order to get reliable results.

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The research works of Coulomb and Amontons and generalized laws of friction

Abstract: Abstract:The paper is devoted to the contributions of Coulomb and Amontons to the physics of friction from the viewpoint of current discussions and attempts to formulate generalized laws of friction.

Cited by 158 publications

References 19 publications

Continuum contact models for coupled adhesion and friction

Continuum contact models for coupled adhesion and friction

Miskonsepsi gaya gesek pada mahasiswa

The Influence of System Dynamics on the Frictional Resistance: Insights from a Discrete Model

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