南京航空航天大学民航学院,江苏 南京 211106
傅先文(1998—),男,硕士研究生。主要从事材料动态力学性能研究。E‑mail:fuxianwen@nuaa.edu.cn
柳锦春(1973—),男,教授,博士。主要从事工程结构抗爆与防护研究。E‑mail:weise@163.com
收稿:2022-02-28,
修回:2022-06-06,
纸质出版:2023-10-15
移动端阅览
傅先文,柳锦春,孙妮等.6061‑T6铝合金材料的冲击压缩力学性能实验与数值模拟[J].防灾减灾工程学报,2023,43(05):1076-1083.
FU Xianwen,LIU Jinchun,SUN Ni,et al.Experimental and Numerical Simulation of Impact Compression Mechanical Properties of 6061‑T6 Aluminum Alloy[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1076-1083.
傅先文,柳锦春,孙妮等.6061‑T6铝合金材料的冲击压缩力学性能实验与数值模拟[J].防灾减灾工程学报,2023,43(05):1076-1083. DOI: 10.13409/j.cnki.jdpme.20220228003.
FU Xianwen,LIU Jinchun,SUN Ni,et al.Experimental and Numerical Simulation of Impact Compression Mechanical Properties of 6061‑T6 Aluminum Alloy[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1076-1083. DOI: 10.13409/j.cnki.jdpme.20220228003.
为了探究6061‑T6铝合金的冲击力学性能和在防护结构上的应用前景,采用实验与数值模拟相结合的方法开展分析研究。根据多组准静态压缩及冲击压缩实验数据,对Johnson‑Cook本构模型的相应参数进行了拟合;再进行数值模拟分析,并把数值模拟的结果与实验结果对比分析。最终,得到了6061‑T6 铝合金在常温下的屈服强度、峰值应力等力学参数;拟合出了6061‑T6铝合金J‑C模型的相应参数;研究表明6061‑T6铝合金是一种应变率敏感材料,其屈服强度、流动应力峰值随着应变率的提高而提高,同时材料对冲击荷载的能量吸收也越来越多;当应变率为1 600 s
-1
时,相对于准静态,其屈服强度和极限承载力分别提高了30%、78%;数值模拟结果与实验结果吻合较好,表明拟合的J‑C模型能够较好地表现出6061‑T6铝合金在高应变率下的应力流动行为。研究成果可为6061‑T6铝合金材料冲击动力学分析和在抗爆结构上的应用提供依据和参考,其在防护工程,防灾减灾工程领域上应用前景广阔。
In order to explore the impact mechanical properties of 6061-T6 aluminum alloy and its application prospects in protective structures, the method of combining experiments and numerical simulations was used to carry out analysis and research. Based on multiple sets of quasi-static compression and impact compression experimental data, the corresponding parameters of the Johnson-Cook constitutive model were fitted; Conduct further numerical simulation analysis and compare the results of the numerical simulation with the experimental results. Finally, the yield strength, peak stress and other mechanical parameters of 6061-T6 aluminum alloy at room temperature are obtained. The corresponding parameters of the J-C model of 6061-T6 aluminum alloy are fitted; The results show that 6061-T6 aluminum alloy is a strain rate-sensitive material. Its yield strength and flow stress peak increase with the increase in strain rate, and the energy absorption to the impact load is also increases; When the strain rate is 1 600 s
-1
, the yield strength and ultimate bearing capacity increase by 30% and 78%, respectively, compared with the quasi-static state; The numerical simulation results are in good agreement with the experimental results, indicating that the fitted J-C model can better represent the stress flow behavior of 6061-T6 aluminum alloy at high strain rates. The research results can provide a basis and reference for the impact dynamic analysis of 6061-T6 aluminum alloy and its application in anti-explosion structure. It has broad application prospects in the fields of protection engineering, disaster prevention, and reduction engineering.
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