Low cycle fatigue measurement results on real flip chip solder contacts

Abstract

The paper presents low cycle fatigue results and properties as measured by small solder joints in a shear test setup. These symmetrical triangle experiments were performed at 25 °C by the variation of the specimen's displacements and the solder joint materials. The displacements varied between 2 μm and 8 μm to get strains up to 2 % and stresses up to 40 MPa. The used solder ball alloys are SnAg3.5, SnAg3.0Cu0.75 and SnPb36. The strain rate was close to 1E-2 per second.