Sn-3.5Ag, Sn-0.7Cu鉛フリーはんだの表面変形度合による低サイクル疲労寿命の定義

概要

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The low-cycle fatigue behavior and the relationship between the surface features in the low-cycle fatigue testing and the fatigue life of Sn-3.5Ag and Sn-0.7Cu lead-free solders were investigated at strain rate of 0.1%/s with a non-contact extensometer at room temperature (22℃), 80℃ and 120℃. In addition the fatigue life using the surface deformation of those solders were defined and estimated from the surface features of solders investigated by image processing and compared with Coffin-Manson type of fatigue behavior of solders. The fatigue life of Sn-3.5Ag solder was superior to that of Sn-0.7Cu solder under temperatures of 80℃ and 120℃. The fatigue life defined from surface deformation indicated a close behavior to Coffin-Manson type of fatigue behavior in those solders. This method could identify the low-cycle fatigue life of solders from the surface deformation.
社団法人溶接学会の論文
2006-08-05