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Date: | Tue, 4 Oct 2005 17:21:07 +0200 |
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Werner Engelmaier a écrit :
>Hi Arnaud,
>You did not say whether this is rolled or ED copper. Also, the way you
>described it, you may have a stres concentration geometry.
>You will have a problem with correlating Vickers hardess to ductility,
>particularly since ductility is directional and vickers is not. However, you should
>be able to determine whether there is something different with the failure
>location copper.
>
>
>
>Werner
>
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Werner,
To answer your question, the flex structure is based on a double sided
50µm polyimide without adhesive (35µm RA copper).
Each side of this core has a 50µm acrylic adhesive layer and a 25µm
coverlay.
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