Abstract
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 △JFEM calculated using the elasto-plastic finite element method, a parameter, △JFEM=4JFEM which was proposed in other works was used. The parameter, △JFEM, gave good agreement with △JP-δ at three frequencies.
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