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- since 1996 -

Vallen-Systeme GmbH
The Acoustic Emission Company! Since 1987 Vallen stands for competence and continuity in AE and for reliable business cooperation and support.
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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?





 
 Reply 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 265

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
265
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.




 
 Reply 
 

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