Electronics Forum | Tue Oct 31 21:58:05 EST 2006 | davef
Initial thoughts are: * Strain gage http://www.omega.com/literature/transactions/volume3/strain.html http://www.vishay.com/brands/measurements_group/strain_gages/mm.htm * Moire interferometry http://www.buffalo.edu/news/fast-execute.cgi/article-pag
Electronics Forum | Mon Nov 27 08:05:50 EST 2006 | davef
There is no standard for a strain gage measurement of allowable deflection of a board or a fixture. It's possible that your fixture is causing the BGA cracking that you see. What protion of the BGA is cracking? If it is the solder connection, sear
Electronics Forum | Wed May 14 13:31:22 EDT 2014 | taiji
You should look in to this document: IPC/JEDEC-9704A Printed Circuit Assembly Strain Gage Test Guideline Regards
Electronics Forum | Sat May 17 10:38:49 EDT 2014 | sarason
I hate to say this but in all probability this wont work. I have built real strain gages and they depend on the change(Co-effiecent) of resistence with strain(or Stretch). since you are connecting you elements up with copper wire it will frm part of
Electronics Forum | Thu Jul 17 05:59:50 EDT 2003 | scwalsall
We have started an initiative to eliminate component damage within our SMT area in order to achieve
Electronics Forum | Sat Jun 08 11:01:30 EDT 2019 | davef
I prefer linear variable differential transformer [LVDT] over a strain gage * Schaevitz MP series * National Instruments NI SCXI-1540 * Omega
Electronics Forum | Mon Jul 21 16:06:02 EDT 2003 | davef
We doubt that stain gages will provide the granularity or repeatability to provide meaningful data. Contact: Cemal Basaran, Dr Associate Professor SUNY Buffalo Work: 716-645-2114 X2429 Fax: 716-645-3773 E-Mail: cjb@eng.buffalo.edu 243 Ketler Hal
Electronics Forum | Mon Feb 07 08:34:46 EST 2005 | Dougs
we are still looking into possible causes, we have rigged up a test to determine whether the cap is cracked and have ran a controlled batch off of SMT, these were all tested and look OK. I'm looking into buying some small strain gages to place over
Electronics Forum | Fri Dec 30 11:54:53 EST 2005 | John S.
Seen cap cracking before. It can be caused by thermal stress as noted above, but don't discount mechanical stress and handling. Your depanelization method is a strong candidate. We applied strain gages to baords and benchmarked various mechanical
Electronics Forum | Tue Oct 26 08:41:56 EDT 2004 | Bob R.
When we first got into BGAs on ENIG we were getting joint cracking at in-circuit test. The joints were breaking in the Sn-Ni intermetallic. We did a lot of pull testing while working with our board suppliers and our conclusion was that pull testing
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