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Questions related from Shubrajit Bhaumik
ASTM 4170 indicates the usage of 9 balls in a thrust bearings and the bearing ball diameter is 7.1mm. However, is it wrong if we use a 11 nos. ball thrust bearing and 6.5mm ball diameter? other...
07 November 2023 5,981 0 View
Tribology of lithium.
10 December 2019 533 2 View
I had a mineral oil of 460cSt (containing sulphur and phosphorus), after addition of nanparticles (carbon nano tubes and graphene) the viscosity decreased significantly. literatures says that the...
17 August 2018 6,548 1 View
Two oils were tested. Mineral oil and a vegetable oil. The coefficient of friction of the vegetable was found to be lesser than mineral oil but the roughness was higher in vegetable oil.
03 November 2017 7,418 2 View
Case I : An experiment was conducted using some additives. The additives formed a protective layer on the steel surfaces which reduced the roughness and hence h/Ra increased. Case II: When the...
05 July 2016 1,944 6 View
Mechanical properties influencing coefficnet of friction.
22 June 2016 1,425 2 View
Has anyone worked on the modeling of boundary lubrication regime in the presence of nanoparticles as additives between steel-steel contact?
13 June 2016 4,001 2 View
i am working on nano particle based lubricant, i am using pin on disc and four ball to evaluate the lubricant properties. my target application are gear boxes. i want to simulate the gear box...
31 May 2016 8,912 8 View
Two tests were carried out. One with a vegetable oil and the other with mineral oil. The mineral oil viscosity was almost twice than the vegetable oil. It was observed that the Coefficient of...
11 January 2016 8,340 6 View
A four ball test has three balls stationary and the top ball rotates. What type of contact does the fourth ball have with respect to the other three balls?
26 December 2015 3,953 15 View
As we pour the lubricant in the cup when the balls interact whether regime is boundary lubrication or in hydrodynamic lubrication
24 December 2015 8,468 10 View
in a gear meshing which undergoes sliding rolling sliding whether we experience surface contact or point contact.
24 December 2015 9,667 4 View
Viscosity...Does lubricant viscosity decrease on addition of nanoparticles? An experiment was conducted with 5 concentration of carbon nano tubes in oil. the viscosity increase as comapred to that...
07 November 2015 5,348 16 View
An L9 orthogonal DOE was performed using Minitab. The S/N in case of frictional force is negative.The response of the frictional force and rpm were negative. But in case of other output...
11 July 2015 6,813 5 View
Two experiments were carried out: one with mineral oil and other with vegetable oil. In case of mineral oil the trend of Stribeck curve is followed but in vegetable oil it is opposite. Each test...
24 March 2015 7,210 25 View
A pin on disc experiment has been carried out acc to taguchi does. the response(outputs) are coefficient of friction , frictional force. In taguchi analysis , whether this experiment would be a...
22 March 2015 3,540 2 View
It has been observed that the co-efficient of friction increased and reached a higher point and then gradually decreased. How can I explain the reason for this trend? The experiment was carried...
04 October 2014 403 11 View
At lower rpm we find the spring to oscillate very violently but as we increase the rpm the vibrations were much lesser.
30 September 2014 8,317 3 View
Formula.
13 May 2014 4,146 10 View
Addition of additives in lubricant is to be called what?
07 May 2014 6,189 9 View
ZnO based mineral oil lubricants + EN 24 steel.
07 May 2014 1,449 9 View
Nano particles such as copper oxide, zinc oxide and carbon nano tubes.
24 March 2014 9,335 40 View
In hertzian models we have models for spherical -spherical and spherical-flat, but flat-flat surface is not shown.
14 December 2013 7,827 4 View
Please let me know
13 December 2013 10,017 4 View
.
04 December 2013 4,879 4 View
The composite is not in laminar.
21 February 2013 4,345 1 View
additives used were graphite , graphene and multi wall carbon nano tubes in lubricant.
01 January 1970 6,804 2 View
I have received a sample whose NAS is 3. Our objective is to reduce the NAS value to 1.
01 January 1970 5,890 2 View
