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Sensitivity analysis on the fatigue life of solid state drive solder joints by the finite element method and Monte Carlo simulation

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Abstract

We proposed a method to determine the probabilistic fatigue-life distribution of solid state drives (SSDs) due under thermal cycling through finite element method and Monte Carlo simulation and the effect of their design and operating variables on failure through sensitivity analysis. In the developed finite element model, we utilized the Anand model to represent the viscoplastic behavior of solder balls and utilized the Prony series to represent the viscoelastic behavior of a polymer material in the underfill. In order to verify the developed finite element model, we compared the simulated strain with that measured in a thermal chamber. Using the developed finite element model, thermal cycling analysis was performed to determine the fatigue life of the SSD using the simulated results and Morrow’s energy-based fatigue model. The finite element analysis results showed that the outermost solder ball at the corner of the dynamic random access memory (DRAM), was the most vulnerable component under thermal cycling. Monte Carlo simulation was performed to analyze the fatigue life distribution according to the manufacturing tolerances of the design and operating variables of the SSD. Sensitivity analysis was also performed to determine the effects of variables on number of cycles to failure. The analysis results showed that the minimum temperature of the thermal cycling profile condition and the diameter of the DRAM solder balls dominantly affected the fatigue life of the SSD.

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Acknowledgements

This research was supported by a Semiconductor Industry Collaborative Project between Hanyang University and Samsung Electronics Co. Ltd.

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Authors and Affiliations

  1. PREM, Department of Mechanical Convergence Engineering, Hanyang University, Wangsimni-ro 222, Seongdong-Gu, Seoul, 04763, Korea

    Yeungjung Cho, Jinwoo Jang & Gunhee Jang

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  1. Yeungjung Cho
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  2. Jinwoo Jang
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  3. Gunhee Jang
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Correspondence to Gunhee Jang.

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Cho, Y., Jang, J. & Jang, G. Sensitivity analysis on the fatigue life of solid state drive solder joints by the finite element method and Monte Carlo simulation. Microsyst Technol 24, 4669–4676 (2018). https://doi.org/10.1007/s00542-018-3819-0

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  • DOI: https://doi.org/10.1007/s00542-018-3819-0

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