Pradeep

I would be careful about this. Most likely you will not be spinning about one of the principal axes. In that case the board will behave much like a tire that has not been dynamically balanced. This will place additional stress upon the solder joints as well as the board. You can get a close estimate of the inertial loads using classical mechanics. I would perform the calculations before going forward.

Best regards
Lee
J. L. Parker Ph. D.
JLP Consultants LLC
804 779 3389
  ----- Original Message ----- 
  From: Pradeep Menon<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Monday, December 14, 2009 8:05 PM
  Subject: [TN] Tensile strrength


  We have one of our customers who will be mounting a 6 layer PCB of size
  110x45mm on a shaft which will be rotating at 13000 rpm. The pcb is
  mounted on a supporting plate with 3 -6 mounting points. He wanted our
  suggestion on whether he can use normal FR4 or he should be going with a
  metal core PCB. The board is 1.6mm thick.

  We felt that FR4 might be sufficient and the bond strength of the
  components mounted on the board will be more critical than the PCB tensile
  strength. We felt since thermal management is not an issue in this case,
  metal core may not be required. Will tensile strength of the board be a
  critical parameter in this case and if so, any inputs on what can be
  suggested. Any other suggestions for this application.

  Rgds

  Pradeep

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