60 Sn・40Pbはんだのひずみ速度を考慮した疲労き裂進展特性評価

概要

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The propagation rate of fatigue cracking, da/dN, was measured in center-cracked specimens made of 60 Sn/40 Pb solder under cyclic loading conditions at three frequencies (0.01, 0.1, 1.0 Hz). The measured rates were correlated with the cyclic J-integral values, △J-_<P-δ> calculated from the loaddisplacement hysteresis loops for the solder. The measured crack-propagation rates under the three frequencies were correlated by a line given by da/dN(mm/cycle)=8.5×10^<-4>[△J-_<P-δ>(N/mm)]^1.5. To estimate the life of a solder joint by using cyclic J-integral △J_FEM calculated using the elasto-plastic finite element method, a parameter, △J_FEM=4J_FEM which was proposed in other works was used. The parameter, △J_FEM, gave good agreement with △J_<P-δ> at three frequencies.
一般社団法人日本機械学会の論文
2000-08-25