Abstract

To overcome the limitations of Steinberg's theory for evaluating the mechanical safety of the solder joints of spaceborne electronics in a launch random vibration environment, a critical strain-based methodology was proposed and validated in a previous study. However, in order to apply the critical strain-based methodology to mechanical design of spaceborne electronics with high confidence, its effectiveness must be validated under various conditions of the package mounting locations and the first eigenfrequencies of a printed circuit board (PCB); achieving this validation is the primary objective of this study. For the experimental validation, PCB specimens with ball grid array (BGA) packages mounted on various board locations were fabricated and exposed to a random vibration environment to assess the fatigue life of the solder joint. The effectiveness of the critical strain-based methodology was validated through a comparison of the fatigue life of the packages under test and to the margin of safety, which was estimated using various analytical approaches.

Issue Section:
Research Papers
Keywords:
critical strain, solder joint, mechanical safety, launch random vibration, validation
Topics:
Fatigue life, Random vibration, Safety, Solder joints, Ball-Grid-Array packaging

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