Topographical Change of Engineering Surface due to Running-in of Rolling Contacts

Ismail, Rifky; Tauviqirrahman, Mohammad; Jamari, J.; Schipper, Dirk J.

doi:10.5772/15408

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…In the same time, the coefficient of friction decreases significantly at each constant load until the load is increased for the next step of the loading procedure. This is in agreement with publications that report a decrease of both the roughness and the coefficient of friction during the running-in [1][2][3][4][5]. Indeed, in this contribution, the augmentation of bright areas, as shown previously, was related to an increase of flat smooth regions which are also the contact areas.…”

Section: Evolution Of the Contact Area With Timesupporting

confidence: 81%

“…Under these conditions, the system is described as under mixed lubrication where the load is sustained by both the lubricant and solid-solid contacts. During sliding, the higher asperities in contact are worn out and this leads to an increase of the surface area in direct contact [2][3][4][5]. This increase of contact area causes the load to be sustained by a larger surface so that the local pressure decreases, resulting into a decrease of the wear rate with time.…”

Section: Introductionmentioning

confidence: 99%

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A simple, fast and low-cost method for in situ monitoring of topographical changes and wear rate of a complex tribo-system under mixed lubrication

Meylan

Dogan

Sage

et al. 2016

Wear

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a b s t r a c tThis contribution presents a simple, fast, and low-cost method to track in situ and in real time the evolution of the surface topography. The method combines an optical method (collimated light) with image analysis. The method was validated using a complex tribo-system; a reciprocal sliding of a rough cast iron counter-piece under mixed lubrication.We demonstrated that the optical method is well suited to observe the evolution of the contact areas during sliding. We also proved that the contact area occurs on the highest peaks of the surface roughness. Finally, we estimated the wear rate by combining the information of the contact area and the Abbott-Firestone curve obtained by profilometry. The wear rate was found to be 40 times higher in the early stage of sliding as compared to the steady-state. The running-in of this particular system was found to be approximately 10 h.In addition to be simple, fast and low-cost, the proposed method has other advantages. It is adaptable for real industrial tests conditions. The fast data analysis allows the wear rate of a tribo-system being determined in real-time. This method characterise the real contact areas of the observed piece, which is difficult, if not impossible, to obtain by profilometric observation alone.

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Section: Evolution Of the Contact Area With Timesupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

A simple, fast and low-cost method for in situ monitoring of topographical changes and wear rate of a complex tribo-system under mixed lubrication

Meylan

Dogan

Sage

et al. 2016

Wear

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“…Berbagai perubahan yang terjadi mulai dari pertama kali berkontak sampai dengan mencapai kondisi stabil (steady state) inilah yang disebut dengan istilah Running-in [2]. Kehrwald tahun 1998 menyatakan bahwa dengan melakukan prosedur yang tepat saat running-in, dapat meningkatkan life time suatu sistem permesinan sebesar 40% lebih, dan juga dapat mengurangi gesekan mesin tanpa melakukan perubahan material [3]. Keausan yang terjadi pada permukaan komponen yang berkontak dan bergerak diakibatkan adanya kontak rolling, kontak rolling itu sendiri ada dua yaitu pure rolling dan rolling-sliding.…”

Section: Pendahuluanunclassified

Kaji Eksperimental Running-in Pada Kontak Rolling-Sliding Pasangan Material Aluminium Dengan Baja S45c

Supriyana

Londa

Hidayat

et al. 2013

Rot.

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Keausan yang terjadi pada komponen di sistem permesinan dapat mengakibatkan penurunan kemampuan kerja komponen tersebut (kegagalan kerja komponen). Banyak penyebab yang menimbulkan terjadinya keausan diantaranya adalah kualitas material, kondisi pelumasan, perlakuan pengoperasian komponen terutama pada saat pertama kali komponen permesinan berkontak (running-in) dan lain sebagainnya. Berbagai cara untuk mendeteksi fenomena keausan yang terjadi pada komponen terutama yang berkontak dan bergerak, salah satunya adalah melalui eksperimen. Salah satu parameter untuk mendeteksi adanya gejala keausan adalah perubahan nilai koefisien gesek yang terjadi ketika komponen berkontak dan bergerak. Penelitian ini membahas pengaruh penerapan nilai sr yang berbeda terhadap perubahan nilai koefisien gesek pada fase running-in pada material aluminium dan baja S45C. Peralatan yang digunakan dalam eksperimen ini menggunakan alat uji two disc tribometer. kondisi standar eksperimen nilai slip-roll ratio (sr) 0%, 40%,80% dan 100%, beban tekan 4 kg serta kondisi pelumasan menggunakan minyak pelumas dengan SAE 15W-40. Dimensi benda uji masing-masing disc berdiameter 50 mm, benda uji dengan material aluminium permukaan singgungnya dibuat rata dan pada spesimen dengan material baja S45C dibuat radius dengan jari-jari 5 mm, sedangkan waktu eksperimen adalah selama 60 detik dan setiap 10 detik dilakukan pengukuran kekasaran permukaan pada spesimen yang rata. Hasil eksperimen memperlihatkan perubahan nilai koefisien gesek mempunyai tren menurun seiring waktu running-in yang terus berjalan, perubahan ini diakibatkan beberapa puncak asperiti mulai terpangkas dan jumlah asperiti yang terdeformasi mulai berkurang, kemudian nilai koefisien gesek mulai bergerak turun dan mencapai kondisi rata inilah kondisi steady state karena pada kondisi ini energi yang dikeluarkan untuk melawan gaya gesek yang terjadi relatif lebih sedikit dibanding diawal gerakan dan berkontak. Nilai kekasaran permukaan spesimen juga mengalami perubahan dan hampir semua penurunan nilai kekasaran terjadi pada setiap penerapan nilai sr yang berbeda dan perubahannya menurun sampai kondisi steady state tercapai.

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“…Thus, proper running-in can chang the surface morphology of the gear and improved the meshing characteristics. Furthermore, plastic deformation and wear caused surface micro-modification, especially in rolling\sliding contact [5] . Using a partial factorial design method, Oila and Li [6][7] found pitting resistance was improved by reducing the surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental study of the rolling-enhanced acoustic system for gear tooth surface

Jiang

Zhao

2022

Int J Adv Manuf Technol

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Parameters of gear flanks, such as roughness, hardness, and residual stress, impact their working performance. Therefore, it is essential to optimize these parameters for increasing gears' life. Thus, this study combined the meshing theory and the ultrasonic surface rolling technology, and presented an innovative design to realize ultrasonic burnishing. First， the dimensions of the ultrasonic burnishing device with two nodes integrated with a gear at the bottom were calculated using frequency equations by a numerical method. Second the correctness of the calculating results was verified by simulations and experiments. Third, the influence of the ratio between the width and diameter of the gear on the acoustic system was studied. Finally, experimental platform of the rolling enhanced acoustic system for gear tooth surface is built successfully. A series of experiments were conducted, and the results showed that the roughness decreased and the hardness and the residual stress improved. Therefore, this design provided a new theory and technology to machine complicated surfaces such as gear flanks.

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Topographical Change of Engineering Surface due to Running-in of Rolling Contacts

Cited by 9 publications

References 26 publications

A simple, fast and low-cost method for in situ monitoring of topographical changes and wear rate of a complex tribo-system under mixed lubrication

A simple, fast and low-cost method for in situ monitoring of topographical changes and wear rate of a complex tribo-system under mixed lubrication

Kaji Eksperimental Running-in Pada Kontak Rolling-Sliding Pasangan Material Aluminium Dengan Baja S45c

Design and experimental study of the rolling-enhanced acoustic system for gear tooth surface

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