Abstract

Electronic components in downhole oil drilling and gas industry applications, automotive, and avionics may be exposed to high temperatures (>150 °C) and high strain rates (1–100 per sec) during storage, operation, and handling, which can contribute to the failures of electronic devices. Temperatures in these applications can exceed 200 °C, which is close to melting point for SnAgCu (SAC) alloys. Prior studies at low strain rates have shown property evolution even under moderate exposure to high temperature. In this paper, the evolution of Anand parameters for unaged and aged SAC (SAC105 and SAC-Q) lead-free solder alloys at high strain rates has been investigated induced under sustained periods of thermal aging. The thermal aged lead-free SAC solder alloys specimen has been tested at high strain rates (10–75 per sec) at elevated temperatures of (25 °C–200 °C). The SAC lead-free solder samples were subjected to isothermal aging at 50 °C up to 1-year before testing. To describe the material constitutive behavior, the Anand Viscoplastic model has been used. The effect of thermal aging on Anand parameters also has been investigated. In order to verify the accuracy of the model, the computed Anand parameters have been used to simulate the uni-axial tensile test. The material constitutive behavior has been implemented in a finite element framework to simulate the drop events using the Anand constitutive model and determine the plastic work per shock event. The plastic work per shock event is a measure of the damage progression in the solder interconnects. The constitutive model has been used to simulate the shock event of a ball-grid array package on printed circuit board assembly.

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