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Application of the newest technologies, such as air-coupled ultrasound, digital instrumentation, signal processing, and transducer technology.

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Technical Discussions
Massimiliano Pau
Teacher, -
Univ. of Cagliari, Dept. of Mechanical Engineering, Italy, Joined Sep 2002, 25

Massimiliano Pau

Teacher, -
Univ. of Cagliari, Dept. of Mechanical Engineering,
Italy,
Joined Sep 2002
25
03:38 Jul-25-1998
Analysis of contact patches with pulse-echo method

Hello,

i tried to apply a classic "pulse-echo" method to study
shape and dimensions of contact patches between rail
and wheel

Using a model (Krolikowski, 1992) I was able to calculate
amount of REAL contact area, which is a few part of nominal
(about 30% for a 400 MPa nominal pressure applied)

This is a graphical output (check the attached URL)

There is someone who perform similar analysis?





    
 
 
Wieslaw Bicz
Wieslaw Bicz
09:18 Jul-25-1998
Re: Analysis of contact patches with pulse-echo method
: Hello,

: i tried to apply a classic "pulse-echo" method to study
: shape and dimensions of contact patches between rail
: and wheel

: Using a model (Krolikowski, 1992) I was able to calculate
: amount of REAL contact area, which is a few part of nominal
: (about 30% for a 400 MPa nominal pressure applied)

: This is a graphical output (check the attached URL)

: There is someone who perform similar analysis?

You can very precisely see the contact areas using the method, that we are using in our ultrasonic camera for the fingerprints (see the paper in the may ndt journal or on our page).
We have made many experiments with a contact of two bodys (with many materials). The results are very good. I think, it would be easy to adapt this principle for you experiments.
If you are interesting in doing it, please contact us.




    
 
 

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