13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- Table 1. Loading conditions for low-temperature sintered nano-silver lap-shear joints Name Temperature /℃ Stress amplitude /MPa Mean stress /MPa Dwelling time /s A1 325 10 0 0 A2 325 9 0 0 A3 325 8 0 0 A4 325 7 0 0 A5 325 6 0 0 A6 325 5 0 0 A7 325 6 0 1 A8 325 6 0 3 A9 325 6 0 5 A10 325 6 0 7 A11 325 6 0 9 A12 325 0 6 0 B1 225 10 0 0 B2 225 9 0 0 B3 225 8 0 0 B4 225 7 0 0 B5 225 7 0 1 B6 225 7 0 7 B7 225 7 0 9 3. Results and discussion 3.1 Shear behavior at elevated temperatures As shown in Fig.3, the effect of temperature on strain level of nano-silver joints can be concluded. At room temperature of 25 , the failure strain ℃ is less than 1.5%, which contains a small part of plastic strain and thus a brittle failure. With the temperature increasing, the shear modulus is decreased and the plastic flow of the joint was more obvious. The average shear strength under 4 ambient temperatures is given in Fig. 4. When the temperature is higher than 225 , the ℃ shear strength drops dramatically, and almost halve at the temperature of 325℃ (14MPa).
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