Creep and Creep Rupture of 63 Sn-37 Pb Solder.

This paper studies the creep and creep rupture properties of 63 Sn-37 Pb solder. Creep and creep rupture tests were carried out using 63 Sn-37 Pb solder specimens at 313 K, 353 K and 398 K to develop a creep constitutive equation and to obtain rupture time. Short primary and long tertiary creep stages were found but there was no clear steady creep stage at the three temperatures. A creep constitutive equation was proposed as a function of stress and temperature. The proposed equation predicted the experimental creep strain within a factor of 1.25. A new equation for predicting creep rupture time was also proposed. The equation predicted the experimental rupture time within a factor of two.