Re: Nondestructive testing of railroad wheels at the German Bahn AG

[ Ultrasonic Forum ]
[ Follow Ups ] [ Post Followup ] [ Help ]

Re: Nondestructive testing of railroad wheels at the German Bahn AG
Posted by: Jürgen Rohmann , E-mail: esr-Rohmann@t-online.de, on July 01, 1998 at 13:00:33:
In Reply to: Re: Nondestructive testing of railroad wheels at the German Bahn AG posted by : Todd Snyder on June 24, 1998 at 00:18:06:
We are a small company (50 employees in Germany) and have been working with eddy-current technology for more than 20 years, mainly in aircraft maintenance.
I was not the only one who was shocked to find out that the ICE-disaster was caused by a broken tire. According to the information available at this time, the tire broke because of a fatigue crack which originated on the inside and had reached approximately 60 % of the cross section.
Between 1993 and 1996 we worked on a project which used the magnetic inductive method to detect deep cracks(more than 4 mm below the running surface) which originated at the running surface, but were not connected to the running surface any more. Finally, with the means available to us, we were able to achieve a depth of penetration (drilled holes with a diameter of 2 mm and filled with ferrous bolts) of up to 20 mm below the running surface. For more details, please visit our home page at http://www.rohmann.de.
Unfortunately, we did not get a chance to prove this principle on natural fatigue cracks. However, now that things look different here in Germany, we hope to receive wheels with fatigue cracks to continue this project.
Therefore, I would like to pose the following question: Which type of "magnetic technique" was used at Union Pacific Railroad? We would appreciate a detailed account which could help us with continuing our project.
Thank you very much in advance.
Yours sincerely
Jürgen Rohmann
Rohmann GmbH

Follow Ups:

Post a Followup:

Name:

E-Mail:

Subject:

Comments:
: We are a small company (50 employees in Germany) and have been working with eddy-current technology for more than 20 years, mainly in aircraft maintenance. : I was not the only one who was shocked to find out that the ICE-disaster was caused by a broken tire. According to the information available at this time, the tire broke because of a fatigue crack which originated on the inside and had reached approximately 60 % of the cross section. : Between 1993 and 1996 we worked on a project which used the magnetic inductive method to detect deep cracks(more than 4 mm below the running surface) which originated at the running surface, but were not connected to the running surface any more. Finally, with the means available to us, we were able to achieve a depth of penetration (drilled holes with a diameter of 2 mm and filled with ferrous bolts) of up to 20 mm below the running surface. For more details, please visit our home page at http://www.rohmann.de. : Unfortunately, we did not get a chance to prove this principle on natural fatigue cracks. However, now that things look different here in Germany, we hope to receive wheels with fatigue cracks to continue this project. : Therefore, I would like to pose the following question: Which type of "magnetic technique" was used at Union Pacific Railroad? We would appreciate a detailed account which could help us with continuing our project. : Thank you very much in advance. : Yours sincerely : Jürgen Rohmann : Rohmann GmbH

Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP

Link Title: is important! Information on my Home Page

Optional Image URL: http://www....gif

[ Ultrasonic Forum ] [ Help ]

Optional Link URL:	Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP
Link Title: is important!	Information on my Home Page
Optional Image URL:	http://www....gif