TechNetters,

Due to copper trace cracking on a flex assembly, we would like to
characterize the copper ductility.
The crack occurs at a trace to pad junction on a specific batch, and a
variation of the copper ductility is suspected.
Any idea on how to assess it? I am suggested a Vickers hardness
measurement, but I am unsure it can really be correlated to the exposed
problem.
Note also that the measurement would have to be done on manufactured
flex, not specific coupons.

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