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 Nov 29 01:12:12 EST 2006 | callckq
Dear Davef, Thanks for your input...The crack happen at the pad/solder ball interface..Pls review the new thread that I post just now with title called "BGA BALL CRACK AT PAD/SOLDER BALL INTERFACE" Thanks!
Electronics Forum | Wed Dec 08 10:45:27 EST 2021 | majdi4
Hello Folks , who has an idea on a means of measuring strain gauge in order to control the mechanical deformation on the pcb / SMC .. your proposals are welcome ! Thank you in advance !
Electronics Forum | Thu Dec 09 13:00:29 EST 2021 | saberbouras
Hi, I suggest that you check this equipment. https://www.azosensors.com/equipment-details.aspx?EquipID=1102
Electronics Forum | Thu May 15 09:55:16 EDT 2014 | julianf
Tmo, Thanks for your reply. It gives good advise about how to perform tests. The type of strain gauges that I want to design are inside the PCB at various layers and I want to read the data during the press step. Do you know if these prefabricated
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 | Thu May 15 17:34:17 EDT 2014 | taiji
I always made tests with gauges on top or bottom surface of the PCB, before, during and after the process that we wanted to check. But I never tried to do it on internal layers of PCB. Don't know if that is possible. Regards
Electronics Forum | Fri May 16 05:17:13 EDT 2014 | julianf
Interesting. How did you connect the gauges in the press? Our press only has connections for thermocouples. But in essence, it's only a wire and an electical output. If you placed these prefabricated gauges on top and on the bottom surface, weren't
Electronics Forum | Mon May 26 03:27:00 EDT 2014 | julianf
Thanks for your reply Sarason. I'm aware now that my goals seem very ambitious and infeasible. Let me formulate my problem in an different way that might be more realistic. Is it possible to measure a DIFFERENCE in strain between top and middle la
Electronics Forum | Wed May 14 10:20:37 EDT 2014 | julianf
Hello all! For my mechanical engineering study I want to etch a strain gauge in the Wheatstone bridge configuration in a copper layer of an PCB. The goal is to measure the strain occurring in an PCB even during the press process! We can measure with
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