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ZHANG Liang, HAN Jiguang, GUO Yonghuan, HE Chengwen, LAI Zhongmin, WANG Hongwei. Fatigue life prediction of Sn3.9Ag0.6Cu-soldered joints in WLCSP device[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (3): 97-100.
Citation: ZHANG Liang, HAN Jiguang, GUO Yonghuan, HE Chengwen, LAI Zhongmin, WANG Hongwei. Fatigue life prediction of Sn3.9Ag0.6Cu-soldered joints in WLCSP device[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (3): 97-100.
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Fatigue life prediction of Sn3.9Ag0.6Cu-soldered joints in WLCSP device

  • 1.

    Mechanical and Electrical Engineering Institute, Xuzhou Normal University, Xuzhou 221116, China;Provincial Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Zhenjiang 212003, China

  • 2.

    Mechanical and Electrical Engineering Institute, Xuzhou Normal University, Xuzhou 221116, China

  • 3.

    Provincial Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Zhenjiang 212003, China

  • 4.

    School of Material Engineering, Nanjing Institute of Technology, Nanjing 211167, China

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  • Received Date: September 22, 2011
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    • Abstract
  • Based on creep model,the fatigue life of Sn3.9Ag0.6Cu-soldered joints in WLCSP device is predicted using finite element method.It is found that the stress concentrates on the top surface of the outermost soldered joints,and this location could be the origin of micro-crack,which is in well agreement with the experimental results.After the stress-strain analysis,the accumulated increase of creep strain and creep strain energy density was found in the soldered joints,respectively.Two life prediction equations,comparing with the experimental results,were employed to analyze the fatigue life of SnAgCusoldered joints under thermal cycling test.It is seen that the calculated life with creep strain energy based fatigue life prediction equation coincides well with that of the experimental data,and the life calculated by creep strain based equation is significantly higher than that of the experimental result,therefore,the creep strain equation needs to be further studied.
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