scholarly journals STUDI EKSPERIMENTAL KEAUSAN KUNINGAN MENGGUNAKAN PIN-ON-DISC TIPE POINT CONTACT

2020 ◽  
Vol 16 (2) ◽  
Author(s):  
Imam Syafa’at ◽  
Adi Nurman ◽  
Darmanto Darmanto
Keyword(s):  
Point Contact ◽  
Disc Material ◽  
Pin On Disc

Keausan adalah hilangnya materi yang timbul sebagai akibat interaksi mekanik dua permukaan yang saling bergesekan dan dibebani, maka akan terjadi keausan, atau perpindahan materi. Kontak yang terjadi antara dua benda dapat berupa titik (point), garis (line), ataupun elips. Analisis keausan dapat dicari menggunakan beberapa metode diantaranya dengan hasil perhitungan secara analitik dan hasil penelitian secara eksperimental. Tribometer pin-on-disc adalah alat uji untuk mengetahui kedalaman dan volume keausan. Penelitian ini bertujuan untuk mengetahui keausan bola kuningan yang digesekkan dengan disc. Material untuk pin terbuat dari kuningan dan disc terbuat dari baja. Pembebanan yang digunakan adalah 6, 8, dan 10 N. Variasi waktu yang digunakan adalah 2,4,8, dan 16 menit. Hasil dari penelitian ini pada pembebanan 10 N pada jarak sliding 180,48 m hasil keausannya adalah 3,047E-05 m. Volume keausan pada jarak 180,48 m dengan pembebanan 10 N hasil volume keausannya adalah 2,165E-11 m3. Semakin bertambah pembebanan dan jarak sliding maka nilai keausan semakin bertambah. Kata kunci: Keausan, pin-on-disc, point contact

scholarly journals ANALISIS KEAUSAN BESI COR DENGAN LAPISAN HARDCHROME TANPA PELUMAS MENGGUNAKAN PENGUJIAN PIN-ON-DISC

2020 ◽  
Vol 16 (2) ◽  
Author(s):  
Feri Adi Prayitno ◽  
Imam Syafa’at ◽  
Darmanto Darmanto
Keyword(s):  
Point Contact ◽  
Aisi 52100 ◽  
Pin On Disc

Gesekan merupakan faktor penting dalam mekanisme operasi sebagian besar peralatan atau mesin. Akibat gesekan antara komponen maka akan timbul adanya pengikisan permukaan komponen atau sering disebut keausan (wear). Hardchrome plating sering dipakai untuk melapisi peralatan atau komponen mesin industri yang bergerak, karena lapisan hardchrome memiliki kekerasan yang tinggi dan lebih tahan terhadap keausan. Tujuan dari penelitian ini adalah untuk mengetahui nilai keausan permukaan besi cor dengan hardchrome plating. Dua buah spesimen besi cor FCD 50 (disc A) dan FCD 60 (disc B) berbentuk disc diberi perlakuan permukaan hardchrome plating. Kemudian dilakukan pengujian point contact (pin-on-disc) dengan pin identor sesuai standar AISI 52100 berbentuk bola berdiameter 9,5 mm dengan menggunakan pembebanan 10 N dan 20 N tanpa pelumas. Dari hasil penelitian nilai volume keausan terbesar yaitu 8,5387 mm³ dan volume keausan terkecil yaitu 0,2083 mm³. Koefisien keausan terbesar yaitu 7,1156 ×〖10〗^(-7) mm3/N.mm dan koefisien keausan terkecil yaitu 1,48985 ×〖10〗^(-7) mm3/N.mm. tinggi keausan menggunakan penurunan metode Archard (1953) didapat tinggi keausan terbesar yaitu 0,071125222 mm, dan tinggi keausan terkecil yaitu 0,004248622 mm. Kata kunci : Hardchrome, plating, koefisien, wear.

Experimental study of wear for implant materials under dry sliding conditions

2017 ◽  
Vol 69 (6) ◽  
pp. 828-832 ◽  
Author(s):  
Soumyajit Mojumder ◽  
Soumya Sikdar ◽  
Subrata Kumar Ghosh
Keyword(s):  
Human Body ◽  
Experimental Studies ◽  
Ceramic Materials ◽  
Point Contacts ◽  
Content Type ◽  
Implant Materials ◽  
Disc Material ◽  
Pin On Disc ◽  
Materials Used ◽  
Better Than

Purpose Artificial biomaterials are implanted to the human body to support the structure depending upon the extent of deformity or damage. This paper aims to formulate an experimental approach to assess the suitability of materials that can be used in the manufacture of human implants. Design/methodology/approach Five different pin materials such as SS304, Alumina, HDPE, UHMWPE and Brass have been chosen to be suitable for implants. The tribological properties of the aforementioned materials have been tested on a simple pin-on-disc apparatus. EN31 was chosen as the disc material because its hardness value is much higher than that of the pin materials used. The test materials were constructed in the form of spherical end pins to have point contacts and to reduce the depth of wear. Findings It has been observed that the polymeric (HDPE and UHMWPE) and ceramic materials (Alumina) are much better than the traditional metallic materials. The wear rate is very low for these materials owing to their self-lubricating properties. Practical implications The experimental studies will help predict the performance and life of implant materials in the human body. Originality/value In most cases, SS316L that possesses nickel compositions is used as the disc material; SS316L is toxic to the human body. In the present study, a high carbon alloy steel with high degrees of hardness EN31 is used as a disc counter-face material.

Studies of the Sensitivity of Brake Squeal

2006 ◽  
Vol 5-6 ◽  
pp. 473-480 ◽  
Author(s):  
T. Butlin ◽  
J. Woodhouse
Keyword(s):  
Characteristic Equation ◽  
Transfer Functions ◽  
Point Contact ◽  
Coupled System ◽  
Sliding Contact ◽  
Brake Squeal ◽  
Lumped Parameter ◽  
Lumped Parameter Models ◽  
Model Predictions ◽  
Pin On Disc

The problem of ‘brake squeal’ in the automotive industry remains despite over 70 years of research: the phenomenon is still surprisingly unpredictable and poorly understood. The literature has moved from very simple lumped parameter models to ever more sophisticated finite element models, but testing theory against measurements has been hindered by the difficulty in obtaining repeatable results. It would seem the phenomenon is extremely sensitive to changes in parameters beyond an experimenter’s control. This paper describes recent results from a project to identify and quantify the sources of uncertainty within sliding contact systems and to determine the sensitivity of the friction-coupled system to uncertain parameters. The theoretical approach taken is to use a linear analysis based on the uncoupled transfer functions of two general subsystems to predict stability when they are coupled by a sliding point contact. The model is tested using a pin-on-disc rig whose uncoupled transfer functions can be measured. Using a stability criterion based on the roots of the characteristic equation of the system, the sensitivity of model predictions to parameter variations is investigated numerically. It is shown that using a realistic range of parameters the root locations change considerably and enough to change stability predictions. As the complexity of the model is increased reliable results become harder to achieve as the characteristic equation becomes more ill-conditioned. This is not simply a result of the high order of the system, but is thought to be a result of particular mode combinations. Experimental work shows uncoupled transfer functions vary over time and by enough to significantly affect squeal predictions. These results suggest reasons for the difficulty in obtaining repeatable measurements and for the unreliability of squeal prediction theories developed so far. If the reasons for the sensitivity of squeal can be understood it may be possible to design sliding contact systems that are more robust.

Point-contact spectroscopy of quasi-1D conductors with CDW

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-179-Pr10-181
Author(s):  
A. A. Sinchenko ◽  
Yu. I. Latyshev ◽  
S. G. Zybtsev ◽  
I. G. Gorllova
Keyword(s):  
Point Contact ◽  
Point Contact Spectroscopy

scholarly journals Tribological Properties of Al2O3 Nanoparticles as Lithium Grease Additives

Lubricants ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Ahmed Nabhan ◽  
Ahmed Rashed ◽  
Nouby M. Ghazaly ◽  
Jamil Abdo ◽  
M. Danish Haneef
Keyword(s):  
Tribological Properties ◽  
Wear Scar ◽  
Al2o3 Nanoparticles ◽  
Lithium Grease ◽  
Pin On Disc ◽  
Scar Width

The tribological properties of Lithium grease specimens with different concentrations of Al2O3 nanoparticles were investigated using a pin on disc apparatus under different sliding speeds and normal loads. Results showed that Al2O3 nanoparticles enhanced the tribological properties of lithium grease and reduced the COF and wear scar width by approximately 57.9% and 47.5% respectively.

Split beam method for determining mode shapes of cantilever beams under multiple loading conditions

2021 ◽  
pp. 107754632110276
Author(s):  
Jun-Jie Li ◽  
Shuo-Feng Chiu ◽  
Sheng D Chao
Keyword(s):  
Operation Mode ◽  
Point Contact ◽  
Mode Shapes ◽  
Cantilever Beams ◽  
Loading Conditions ◽  
Mechanical Responses ◽  
Relative Contribution ◽  
Resonance Frequencies ◽  
Beam Method ◽  
Multiple Loading

We have developed a general method, dubbed the split beam method, to solve Euler–Bernoulli equations for cantilever beams under multiple loading conditions. This kind of problem is, in general, a difficult inhomogeneous eigenvalue problem. The new idea is to split the original beam into two (or more) effective beams, each of which corresponds to one specific load and bears its own Young’s modulus. The mode shape of the original beam can be obtained by linearly superposing those of the effective beams. We apply the split beam method to simulating mechanical responses of an atomic force microscope probe in the “dynamical” operation mode, under which there are a stabilizing force at the positioner and a point-contact force at the tip. Compared with traditional analytical or numerical methods, the split beam method uses only a few number of basis functions from each effective beam, so a very fast convergence rate is observed in solving both the resonance frequencies and the mode shapes at the same time. Moreover, by examining the superposition coefficients, the split beam method provides a physical insight into the relative contribution of an individual load on the beam.

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