Effect of temperature and stress ratio on fatigue crack growth behavior of 6061 aluminum alloy
TENG Kui1, LIANG Zhi-guo2, SHI Song-xin1, YANG Hong-yang1, CHEN Shi-hao1
1. Shanghai Aircraft Design and Research Institute, COMAC, Shanghai 201210, China; 2. National Center for Material Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Fatigue crack growth rate tests were carried out in 6061 aluminum alloy under different temperatures (room temperature, -70, 150 ℃) and stress ratios (0.1, 0.5) by electro-hydraulic servo fatigue testing machine, to investigate the influence of temperature and stress ratio on the growth of fatigue crack. The fatigue crack growth rate curves (da/dN-ΔK) under different conditions were obtained. The results indicated that the fatigue crack growth rate curves at room temperature and high temperature (150 ℃) were basically the same under the same stress ratio, while the fatigue threshold value and fatigue crack growth rate at low temperature (-70 ℃) significantly increased, which suggested that this alloy possessed high fatigue crack growth resistance under low temperature environment. When the temperature remained unchanged, as the stress ratio increased, the fatigue threshold value decreased and the fatigue crack growth rate increased. The possible reason for the influence of temperature and stress ratio on the fatigue crack growth behavior was discussed.
滕奎, 梁治国, 石松鑫, 杨鸿旸, 陈诗豪. 温度与应力比对6061铝合金疲劳裂纹扩展行为的影响[J]. 中国冶金, 2021, 31(12): 102-106.
TENG Kui, LIANG Zhi-guo, SHI Song-xin, YANG Hong-yang, CHEN Shi-hao. Effect of temperature and stress ratio on fatigue crack growth behavior of 6061 aluminum alloy[J]. China Metallurgy, 2021, 31(12): 102-106.
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2021, Vol. 31 
