ultrasonic horn failure mode

[jcamt]

What is the typical failure mode for an ultrasonic horn (long slender titanium)? I have one horn that works and one that has just ceased to work. What's the likely reason. The inop one appears to be intack and phyically identical to the one which works. The mounting face appears pristine.

Thanks
jcamt

 

[ishvaaag]

No idea but others have

http://home.att.net/~Berliner-Ultrasonics/usonicsa.html#failure

Fatigue, stress concentration, stress raisers etc.

http://www.google.es/search?hl=es&i...n+modes+failure&btnG=Búsqueda+en+Google&meta=