Abstract:In this study, shear strain controlled torsional test method was developed for torsional fatigue life prediction of DRAM module. The maximum principal strain and its direction was measured using rosette gage during module inserting user environment, and it was verified that shear strain was the dominant driving factor for solder joint failure. Apart from other studies where torsional tests were controlled by angle or torque, shear strain was adopted as a control parameter, which minimized the distortion result… Show more
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