Fatigue and dwell-fatigue behavior of nano-silver sintered lap-shear joint at elevated temperature

• Mechanics behavior of nano-silver joint was examined at elevated temperature.
• The shear strength decreases with the increase of temperature.
• Basquin model is presented to predict the fatigue life at different temperatures.
• The creep damage dominates the failure process of the joints at 325 °C.

Load-controlled fatigue and dwell-fatigue tests were conducted at elevated temperature to describe the high temperature mechanics behavior of nano-silver sintered lap-shear joints. The results showed that the shear strength of nano-silver sintered lap-shear joints was strongly temperature dependent, and almost halved at the temperature of 325 °C. The Basquin model was used to assess the fatigue life of the joints at elevated temperature and the constants in the model were figured out, which yielded good prediction for experimental data. In dwell-fatigue tests, at the temperature of 325 °C, creep was found the dominant factor that resulted in failure acceleration and cyclic life reduction. With the temperature decreasing to 225 °C, the creep played a less important role to the total deformation.