Hi Bev,



Keeping solder under load (other than compressive) is not a good idea due to creep. Cannot cite papers, but this is explained in Klein Wassink's "Soldering in Electronics". Per this book:



"for eutectic SNPb solder at 20 C, the time to failure for various stresses is approximately

10 N/mm square - 10 hours

4 N/mm square - 1000 hours

2 N/mm square - 100000 hours"



I guess a web search for "solder creep" will return something.



Best regards,



Ioan



-----Message d'origine-----

De : TechNet [mailto:[log in to unmask]] De la part de BEV CHRISTIAN

Envoyé : November 14, 2017 3:12 PM

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Objet : [TN] Question on Loading Solder Joints



TechNetters,

A fellow ex-BlackBerry employee sent me the following query. I obviously no longer have access ot the search capabilities I had at BB.  Can anyone offer any suggestions for papers that will meet his needs?  I mean I know the reason why, but he wants a paper that proves it.



I need help with locating a couple of good papers and research studies that explain why designs that place a constant tensile or shear load on board connectors(USB, HDMI, RCA, AC inlet etc.) are a bad idea. Can you point me to a couple of papers on this ? Thanks. 



Regards,

Bev



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