Abstract
In this research, cohesive parameters were extracted for Sn-0.7Cu/Cu solder joint failure. Double cantilever beam (DCB) specimens were used to study the fracture of the joint under both mode-I and mixed-mode conditions. A bilinear traction separation law (TSL) was used to capture the failure of the joint. Increasing the bond-line thickness from 110 to 880 µm increased the critical energy release rate for crack initiation (Gci) and maximum traction of the bilinear TSL. This increase in the Gci was attributed to an increase in plastic zone area (PZA) ahead of the pre-crack tip. Varying the mode-mixity with phase angle (ψ) in the range of 00–330 showed an insignificant change in Gci and maximum traction of the bilinear TSL.
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