13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- Fig. 5 Comparison of hysteresis loop under different loading amplitudes Fig. 6 Comparison of strain amplitude under different loading amplitudes at the temperature of 325℃ (a) At the loading amplitude of 6 MPa (b) At the loading amplitude of 8MPa Fig. 7 Comparisons of hysteresis loops under different cycles The temperature effects on hysteresis loops under 7MPa and 9MPa loading amplitude are shown in Fig. 8. It can be found that at higher temperature of 325℃, more plastic strain is present and the loops are wider, which causes the cyclic plastic deformation in the joint to be more severe. As a result, the fatigue life at the temperature of 325℃ is shorter than that at the temperature of 225 ℃. It should not be ignored that higher temperature could mobilize the dislocation of the nano-silver joints, which leads to a significant reduction of fatigue life.
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