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- W2129426211 abstract "The effects of underfill material properties on the reliability of solder bumped flip chip on printed circuit board (PCB) with imperfect underfill encapsulants were studied. Three different types of underfill imperfections were considered; i.e., (1) interfacial delamination between the underfill encapsulant and the solder mask on the PCB (crack initiated at the tip of underfill fillet); (2) interfacial delamination between the chip and the underfill encapsulant (crack initiated at the chip corner); and (3) the same as (2) but without the underfill fillet. Five different combinations of coefficient of thermal expansion (CTE) and Young's modulus with the aforementioned delaminations were investigated. A fracture mechanics approach was employed for computational analysis. The strain energy release rate at the crack tip and the maximum accumulated equivalent plastic strain in the solder bumps of all cases were evaluated as indices of reliability. Besides, mechanical shear tests were performed to characterize the shear strength at the underfill-solder mask interface and the underfill-chip passivation interface. The main objective of the present study is to achieve a better understanding of the thermo-mechanical behavior of flip chip on board (FCOB) assemblies with imperfect underfill encapsulants." @default.
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- W2129426211 date "2003-01-20" @default.
- W2129426211 modified "2023-09-24" @default.
- W2129426211 title "Effects of underfill material properties on the reliability of solder bumped flip chip on board with imperfect underfill encapsulants" @default.
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- W2129426211 doi "https://doi.org/10.1109/ectc.1999.776237" @default.
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