锻压技术

腐蚀及温度循环对6061铝合金力学性能的影响

英文标题：Influence of corrosion and temperature cycle on mechanical properties for 6061 aluminum alloy

作者：刘兵飞罗雪航

单位：中国民航大学

分类号：TG146.2

出版年,卷(期):页码：2022,47(7):243-252

摘要：

为合理描述6061铝合金在腐蚀和温度循环下的应力流动行为,通过理论研究、实验测试和有限元仿真相结合的手段讨论了腐蚀及温度循环对6061铝合金力学性能的影响。实验研究结果表明：腐蚀和温度循环均可导致6061铝合金屈服强度和抗拉强度的降低；且腐蚀液浓度越高、温度循环次数越多，材料力学性能下降趋势越明显。通过不同腐蚀和温度循环条件下应力-应变曲线的对比,修正了Johnson-Cook本构模型并标定了各项系数,得到了考虑腐蚀和温度循环下的修正本构模型，且理论模型与实验测试及有限元结果吻合良好；进而基于该本构模型，讨论了腐蚀时间和腐蚀浓度和温度循环次数对6061铝合金力学性能的影响。

In order to reasonably describe the stress flow behavior of 6061 aluminum alloy under corrosion and temperature cycling, the influences of corrosion and temperature cycling on the mechanical properties of 6061 aluminum alloy were discussed by the combination of theoretical research, experimental tests and finite element simulation. The experimental results show that both corrosion and temperature cycling can lead to the reduction of yield strength and tensile strength for 6061 aluminum alloy. The higher the concentration of corrosive solution is, the more the times of temperature cycles is, and the more obvious the downward trend of mechanical properties for the material is. By comparing the stress-strain curves under different corrosion and temperature cycling conditions, the Johnson-Cook constitutive model is revised and various coefficients are calibrated, and the revised constitutive model considering corrosion and temperature cycling is obtained. The theoretical model is in good agreement with the experimental tests and finite element results. Based on the constitutive model, the influences of corrosion time, corrosion concentration and temperature cycle on the mechanical properties of 6061 aluminum alloy are discussed.

基金项目：

国家自然科学基金资助项目(11502284)；中科院重点部署项目(KFZD-SW-435)；中央高校基本科研业务费(3122020077)

作者简介：刘兵飞(1985-)，男，博士，副教授 E-mail：bingfeiliu2@126.com

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