Abstract
In this study, Direct-Current Potential Difference Method (DC-PDM) was proposed for quantitative evaluation of crack initiation and propagation on joining between copper-cored lead-free solder ball and copper plate specimen when copper plate specimen was subjected to cyclic tension. Finite element method was used for three dimensional potential analysis to clarify the relationship between change in potential difference and change in crack depth. In addition, influence of crack depth and joint condition on potential difference was considered. It was found that the relationship between crack size and potential difference is represented by a master curve with modification coefficient of core independently of joint condition.
