温度对7N01-T4铝合金疲劳行为的影响

开展了7N01-T4铝合金在实验室空气下室温、100 ℃和-60 ℃ 3种温度条件的疲劳S-N曲线测试,研究了不同温度对7N01-T4铝合金疲劳性能的影响.结果表明:-60 ℃环境对7N01-T4铝合金疲劳性能是有益的,而100 ℃环境会降低其疲劳性能;7N01-T4铝合金在室温、100 ℃和-60 ℃环境下的缺口敏感度系数分别为0.63、0.60和0.59,这3种温度环境对7N01-T4铝合金敏感度系数基本没有影响;100 ℃环境K_t=1和K_t=3下的DFR值比室温分别下降24%和16%;-60 ℃环境K_t=1和K_t=3下的DFR值比室温分别提高42%和14%.

Effect of Temperature on Fatigue Behavior of 7 N01-T4 Aluminum Alloy

The fatigue S-N curves of 7N01-T4 aluminum alloy were tested at room temperature, 100 ℃ and -60 ℃; the influence of the fatigue properties were investigated in different temperature environment. The test results show that -60 ℃ temperature environment is beneficial to the fatigue property of 7N01-T4 aluminum alloy, and 100 ℃ temperature environment reduces the fatigue property of 7N01-T4 aluminum alloy. The notch-sensitivity factors of room temperature, 100 ℃ and -60 ℃ are 0.62, 0.60 and 0.59, respectively. The three kinds of temperature environments don’t influence the notch-sensitivity factors. The DFR values of K_t=1 and K_t=3 specimens at 100 ℃ decrease by 24% and 16% respectively compared with room temperature, and the DFR values of K_t=1 and K_t=3 specimens at -60 ℃ increase by 42% and 14% respectively compared with room temperature.