Mechanical Engineering homework help

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To ——————
Associate Professor —————-
University of ———————-
——————-
 
Dear Dr.——-
 
Please find enclosed the internship research report on a unfilled Transfer Film  . This research paper contains description of how the PTFE Transfer film is affected during sliding wear, what causes their deformation, and importance in friction and wear performance are discussed. The result of the research is do seem valid and show recommendation of thickness size of transfer film.
 
 
Best Regards
————–
University of —————–
 
 
 
 
 
 
 
 
 
 
 
 

Abstract:

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Contents
Abstract: 2
Executive summary. 4
Introduction. 4
Research goal(s). 5
Result and Discussion: 6
Conclusion: 8
Reference. 8
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Executive summary

(briefly overview)
What causes their formation, and their importance in friction and wear performance.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Introduction

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Research goal(s)

 
Define what INPUT parameters affect the development of a transfer film during sliding wear of unfilled or neat PTFE.
 
The yellow highlighted text is the direct interests of the research sponsor.
 
These two parameters are of special interest:
 
Contact stress (1MPa, 5 MPa, 15 MPa, 35 MPa, 70 MPa, …whatever he can get to)
(The contact stress is of greatest interest to the research sponsor.)
Counterface surface finish (2 Ra, 4 Ra, 8 Ra, 16 Ra, and 32 Ra) (as a secondary interest)
 
With the assumptions that the following parameters would be held constant:
Sliding speed (.025 m/s)
Ambient temperature (less than 150 oC)
Counterface material (Steel HRC 60)
 
Understanding the variation of these 4 (above) parameters are of interest to get a broader picture (based on the literature).
 
 
Considering the (above) INPUT parameters, the OUTPUT parameters are:
 
The existence of a transfer film on the steel counterface.
The thickness of a transfer film on the steel counterface.
 
The nature of spatial counterface coverage of a transfer film (e.g. free-space-length measurement) is also of interest.
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Result and Discussion:

 

  1. Comprehensive literature search on the nature of PTFE transfer films – including but not limited to answering the following w.r.t. the formation of the film:
    1. The effect of contact stress on transfer film formation for neat PTFE.
    2. The effect of distance slid (speed * time) on transfer film formation for neat PTFE.
    3. The effect of sliding speed (independent of speed) on transfer film formation for neat PTFE.
    4. The effect of temperature on transfer film formation for neat PTFE.

 
There is evidence that temperatures above 150 C can promote PTFE transfer film development.
 
 
 
 
 

  1. The effect of counterface surface finish on transfer film formation for neat PTFE.
  2. The effect of counterface materials on transfer film formation for neat PTFE.
  3. The effect of filler materials on transfer film formation for filled PTFE composites.
  4. The effect of contact stress, distance slid, sliding speed, temperature, counterface surface finish and counterface materials on transfer film formation for filled PTFE composites.
  5. The nature of film formation (e.g. the initial thick film, the intermediate thin film seed, and the equilibrium thin film with good counterface coverage.
  6. Can a poorly formed or non-existent transfer film result in damage to the counterface while sliding against PTFE?
  7. other

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

  1. How to measure transfer films of PTFE on counterface surfaces
    1. SEM techniques – include the process and resolution
    2. Light interferometry – including the Zygo that’s available on campus
    3. A table is needed to compare the metrology techniques accuracy and resolution to the needs of the films – such as thickness and area coverage – such as the Free Space Length.

 
 

  1. Proposed experiment to “fill-in” the gap of knowledge from item 5 above and the research goals (item 4) above.

 
 

Conclusion:

Reference

 

  1. Electronic appendix with copies of the papers cited in the reference section.