基于J-C模型修正的7150-T6航空铝合金薄壁开孔圆管结构优化  

Structural Optimization of 7150-T6 Aeronautical Aluminum Alloy Thin-walled Open Circular Tube Based on J-C Model Modification

作　　者：陈睿[1,2] 程诗敏 温仕成 赵子衡 彭锐涛[1,2] 胡聪芳[1,2] 肖湘武 CHEN Rui;CHENG Shimin;WEN Shicheng;ZHAO Ziheng;PENG Ruitao;HU Congfang;XIAO Xiangwu(School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105;Engineering Research Center of Complex Trajectory Machining Technology and Equipment,Ministry of Education,Xiangtan University,Xiangtan 411105)

机构地区：[1]湘潭大学机械工程与力学学院,湘潭411105 [2]湘潭大学复杂轨迹加工工艺及装备教育部工程研究中心,湘潭411105

出　　处：《机械工程学报》2024年第11期95-104,共10页Journal of Mechanical Engineering

基　　金：湖南省教育厅优秀青年(22B0109);国家自然科学基金(11602212);湖南省杰出青年基金(2022JJ10045);湖南省自然科学基金(2018JJ3509);湖南省教育厅一般(19C1785)资助项目。

摘　　要：为了提高薄壁结构的耐撞性能,提出了一种改进的Johnson-Cook材料本构模型,结合数值计算和智能算法开展了航空铝合金薄壁开孔结构优化设计。对7150-T6航空铝合金材料进行了静动态压缩试验,其结果表明该材料具有显著的应变速率敏感性。综合材料的静动态力学特性,提出一种改进的Johnson-Cook模型,并且通过试验验证该模型能更好地描述材料的动态力学行为。结合改进的本构模型和分离式霍普金森压杆试验,建立有效可靠的薄壁圆管霍普金森杆轴向冲击有限元模型,并探讨了等距离设置长方形孔对薄壁圆管构件的耐撞性和最大峰值载荷的影响。利用遗传算法开展航空铝合金薄壁开孔圆管的多目标优化设计,并将其优化结果与试验进行验证。结果表明:改进的模型能够很好地描述7150-T6航空铝合金在不同应变速率下的塑性流动应力特性,且优化后的开孔圆管具有较好的耐撞性能和稳定的变形模式,能为薄壁结构的设计与性能研究提供有效参考。In order to improve the crashworthiness of thin-wall structure,an improved Johnson-Cook material constitutive model was proposed.Combined with numerical calculation and intelligent algorithm,the thin-wall open-hole structure optimization design of aviation aluminum alloy was carried out.Firstly,the static and dynamic compression tests of 7150-T6 aviation aluminum alloy are carried out,and the results show that the material has significant strain rate sensitivity.Secondly,based on the static and dynamic mechanical properties of materials,an improved Johnson-Cook model is proposed,and the experimental results show that the model can better describe the dynamic mechanical behavior of materials.Thirdly,combined with the improved constitutive model and the split Hopkinson pressure bar experiment,an effective and reliable finite element model of the axial impact of thin-walled circular tube Hopkinson bar is established,and the influence of rectangular holes with equal distance on crash-resistance and maximum peak load of thin-walled circular tube members are discussed.Finally,genetic algorithm is used to carry out the multi-objective optimization design of aviation aluminum alloy thin-walled circular tube with open hole,and the optimization results are verified by experiments.The results show that the improved J-C model can well describe the plastic flow stress characteristics of 7150-T6 aviation aluminum alloy under different strain rates,and the optimized open-hole circular tube has good crash resistance and stable deformation mode,which can provide an effective way for design and performance research of thin-walled structure.

关 键 词：7150-T6航空铝合金 结构优化 Johnson-Cook本构模型修正 SHPB试验 

分 类 号：TH142[一般工业技术—材料科学与工程]