Yongrae Jang1, Yu-Hsiang Yang1, Bongtae Han1, You-Gwon Kim2, and Hak-Sung Kim2
1Mechanical Engineering Department, University of Maryland, College Park, MD, USA
2Departement of Mechanical Convergence Engineering, Hanyang University, Seoul, South Korea
For more information about this article and related research, please contact Prof. Bongtae Han.
Reliability of SAC-LTS hybrid joints is assessed. Two tasks are conducted to achieve the goal. The first task involves determination of the Bi concentration dependent constitutive properties. A simple solder assembly is fabricated to examine the distribution of Bi concentration within a hybrid solder joint. Based on the distribution results, specimens with known Bi concentrations are fabricated and tested at various temperatures to obtain the constants of the Anand model as a function of Bi concentration. In the second task, an FEM model is developed to simulate various layers with different Bi concentrations in the hybrid joint. The well-known energy-based fatigue model is implemented to predict the cycles to failure. The prediction is compared with actual thermal shock testing data, and the results are discussed.
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