REINFORCING EFFECT OF COVERLAYERS ON THE FATIGUE LIFE OF COPPER-KAPTON FLEX CABLES

Authors
ZEHNDER AT INGRAFFEA AR
Citation
At. Zehnder et Ar. Ingraffea, REINFORCING EFFECT OF COVERLAYERS ON THE FATIGUE LIFE OF COPPER-KAPTON FLEX CABLES, IEEE transactions on components, packaging, and manufacturing technology. Part B, Advanced packaging, 18(4), 1995, pp. 704-708
Citations number
8
Categorie Soggetti
Engineering, Eletrical & Electronic","Engineering, Manufacturing","Material Science
Journal title
IEEE transactions on components, packaging, and manufacturing technology. Part B, Advanced packaging → ACNP
ISSN journal
10709894
Volume
18
Issue
4
Year of publication
1995
Pages
704 - 708
Database
ISI
SICI code
1070-9894(1995)18:4<704:REOCOT>2.0.ZU;2-6
Abstract
Flex cables constructed of copper sandwiched between Kapton (polyimide ) fail under repeated bending due to the formation and propagation of fatigue cracks in the copper. It is observed that fatigue life of roll ed-annealed copper cables with a coverlayer of Kapton is significantly higher than cables without a coverlayer, This result is explained usi ng a fracture mechanics analysis where the Kapton layers bridge across cracks in the copper, shielding the crack from the full stresses. Thi s retards crack growth, hence increasing fatigue life of the cables.