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Quick assessment methodology for reliability of solder joints in ball grid array (BGA) assembly—Part II: Reliability experiment and numerical simulation
Authors:Shi Xunqing  John HL Pang  Yang Qianjin  Wang Zhiping  Nie Jingxu
Institution:(1) Dept. of Power Eng., Beijing Univ. of Aeronautics & Astronautics, 100083 Beijing, China;(2) School of Mech. & Prod. Eng., Nanyang Technological Univ, Nanyang Avenue, 639798, Singapore
Abstract:In the present study, a facility, i.e., a mechanical deflection system (MDS), was established and applied to assess the long-term reliability of the solder joints in plastic ball grid array (BGA) assembly. It was found that the MDS not only quickly assesses the long-term reliability of solder joints within days, but can also mimic similar failure mechanisms in accelerated thermal cycling (ATC) tests. Based on the MDS and ATC reliability experiments, the acceleration factors (AF) were obtained for different reliability testing conditions. Furthermore, by using the creep constitutive relation and fatigue life model developed in part I, a numerical approach was established for the purpose of virtual life prediction of solder joints. The simulation results were found to be in good agreement with the test results from the MDS. As a result, a new reliability assessment methodology was established as an alternative to ATC for the evaluation of long-term reliability of plastic BGA assembly. The project supported by the National Natural Science Foundation of China (59705008)
Keywords:long-term reliability  plastic BGA assembly  MDS reliability experiment  FE numerical simulation  acceleration factor
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