How do you calculate the minimum film thickness?

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SUMMARY

The calculation of minimum film thickness between two plates, one smooth and the other featuring square microasperities, is determined by the relationship between the height of the microasperity (denoted as 'a') and the minimum film thickness (denoted as 'b'). The referenced paper provides a graph illustrating this relationship, which is essential for understanding the dynamics of lubrication in such configurations. The precise methodology for deriving the graph involves analyzing the geometric and physical properties of the surfaces in contact.

PREREQUISITES
  • Understanding of lubrication theory
  • Familiarity with surface roughness and microasperity concepts
  • Basic knowledge of tribology
  • Ability to interpret scientific graphs and equations
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  • Research the principles of lubrication theory and its applications
  • Study the effects of surface roughness on film thickness in tribological systems
  • Examine the mathematical models used to calculate film thickness in microstructured surfaces
  • Explore experimental methods for measuring film thickness in real-world applications
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Mechanical engineers, tribologists, researchers in material science, and anyone involved in the study of lubrication and surface interactions in engineering applications.

tomallan
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Hi,

i am wondering how do you calculate the minimum film thickness between two plates, one smooth surface and another surface with a square microasperity. i am just very confused as to how do you determine the film thickness in between them.

I have attached a paper which has a graph on the minimum film thickness and I am wondering how did they arrive with that graph. It said on the paper that b is the minimum film thickness and a is the height of the microasperity.

any help will be appreciated
 

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