约束状态下铝蜂窝异面压缩动态响应研究
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摘要
以小尺寸铝蜂窝为研究对象,利用非线性有限元数值模拟方法,重点研究了约束状态下的响应特性,对比分析了自由状态与约束状态下的异面压缩动态响应。通过仿真结果与理论对比,证明了基于有限元方法研究铝蜂窝异面压缩动态响应的可行性和有效性。研究结果表明:周向约束能显著改善铝蜂窝的变形模式和响应特性;铝蜂窝结构在中低速条件下对压缩速度和加载方式不敏感;初始接触峰值载荷仅与厚跨比线性相关;对相同胞元尺寸的铝蜂窝,峰值载荷、平台载荷、比载荷、吸能量、质量比吸能均与厚跨比呈幂次关系,可由此设计响应理想的铝蜂窝;吸能量-载荷曲线肩点反映了铝蜂窝的最佳设计点,其线性拟合关系对工程应用很有参考价值。
This paper takes the small-size aluminum honeycomb as object of study,uses nonlinear finite element simulation,focus on the response characteristics with constraint,and compares and analyses the dynamic responses under out-of-plane compression with free state and constraint condition. The feasibility and validity of the finite element method are verified by comparing the simulation results with the theoretical ones. The results show that the circumferential constraint can be used to significantly improve the deformation mode and response characteristics of the aluminum honeycomb; The aluminum honeycomb is not sensitive to the compression velocity and loading mode under the medium and low velocity conditions. The initial contact peak load is only linearly related to the ratio of thickness to span; for the aluminum honeycomb with same cell size,the peak load,the platform load,the specific load,the energy absorption,the specific energy absorption are all in a power exponent relationship with the ratio of thickness to span,which can be used for designing the ideal aluminum honeycomb; the shoulder points of energy-load curve reflect the best design points of the aluminum honeycomb,and its linear fitting relationship is of great reference value to the engineering application.
This paper takes the small-size aluminum honeycomb as object of study,uses nonlinear finite element simulation,focus on the response characteristics with constraint,and compares and analyses the dynamic responses under out-of-plane compression with free state and constraint condition. The feasibility and validity of the finite element method are verified by comparing the simulation results with the theoretical ones. The results show that the circumferential constraint can be used to significantly improve the deformation mode and response characteristics of the aluminum honeycomb; The aluminum honeycomb is not sensitive to the compression velocity and loading mode under the medium and low velocity conditions. The initial contact peak load is only linearly related to the ratio of thickness to span; for the aluminum honeycomb with same cell size,the peak load,the platform load,the specific load,the energy absorption,the specific energy absorption are all in a power exponent relationship with the ratio of thickness to span,which can be used for designing the ideal aluminum honeycomb; the shoulder points of energy-load curve reflect the best design points of the aluminum honeycomb,and its linear fitting relationship is of great reference value to the engineering application.
引文
[1] T.Wierzbicki. Crushing analysis of metal honeycombs[J]. Int J Impact Eng,1983(1):157-174.
[2]M.Yamashita,M.Gotoh. Impact behavior of honeycoml structures with vario us cell specifications-numerical simulation and experiment[J]. International Journal of Impact Enineering,2005,32:618-630.
[3]L.Aktay,A.F.Johnson,B.H.Kroplin. Numerical modelling of honeycomb core crush behaviour[J]. Eng Fract Mech,2008,75:2616-2630.
[4]M.Z.Mahmoudabadi,M.Sadighi. A theoretical and experimental study on metal hexagonal honeycomb crushing under quasi-static and low velocity impact loading[J]. Materials Science and Engineering,2011,528:4958-4966.
[5]王中钢,鲁寨军.铝蜂窝异面压缩吸能特性实验评估[J].中南大学学报(自然科学版),2013,3:1246-1251.
[6]胡玲玲,尤帆帆.铝蜂窝的动态力学性能及影响因素[J].爆炸与冲击,2012(1):23-28.
[7]王闯,刘荣强,邓宗全,等.铝蜂窝结构的冲击动力学性能的试验及数值研究[J].振动与冲击,2008(11):56-61,198.
[8]罗昌杰,周安亮,刘荣强,等.金属蜂窝异面压缩下平均压缩应力的理沦模型[J].机械工程学报,2010,46:52-59.
[9]赵辉,宋扬,黄江平.胞元参数对铝蜂窝吸能特性的影响[J].机械设计,2016(9):15-20.
[10]G.R.Cowper,P.S.Symonds. Strain-hardening and strain-rate effects in the impact loading of cantilever beams[R]. Brown Univ Providence Ri,1957:57-60.
[11]李萌.腿式着陆缓冲装置吸能特性及软着陆过程动力学仿真研究[D].哈尔滨:哈尔滨工业大学,2013.
[12]S.K.Maiti,L.J.Gibson,M.F.Ashby. Deformation and energy absorption diagrams for cellular solids[J]. Acta Metallurgica,1984,32:1963-1975.
[2]M.Yamashita,M.Gotoh. Impact behavior of honeycoml structures with vario us cell specifications-numerical simulation and experiment[J]. International Journal of Impact Enineering,2005,32:618-630.
[3]L.Aktay,A.F.Johnson,B.H.Kroplin. Numerical modelling of honeycomb core crush behaviour[J]. Eng Fract Mech,2008,75:2616-2630.
[4]M.Z.Mahmoudabadi,M.Sadighi. A theoretical and experimental study on metal hexagonal honeycomb crushing under quasi-static and low velocity impact loading[J]. Materials Science and Engineering,2011,528:4958-4966.
[5]王中钢,鲁寨军.铝蜂窝异面压缩吸能特性实验评估[J].中南大学学报(自然科学版),2013,3:1246-1251.
[6]胡玲玲,尤帆帆.铝蜂窝的动态力学性能及影响因素[J].爆炸与冲击,2012(1):23-28.
[7]王闯,刘荣强,邓宗全,等.铝蜂窝结构的冲击动力学性能的试验及数值研究[J].振动与冲击,2008(11):56-61,198.
[8]罗昌杰,周安亮,刘荣强,等.金属蜂窝异面压缩下平均压缩应力的理沦模型[J].机械工程学报,2010,46:52-59.
[9]赵辉,宋扬,黄江平.胞元参数对铝蜂窝吸能特性的影响[J].机械设计,2016(9):15-20.
[10]G.R.Cowper,P.S.Symonds. Strain-hardening and strain-rate effects in the impact loading of cantilever beams[R]. Brown Univ Providence Ri,1957:57-60.
[11]李萌.腿式着陆缓冲装置吸能特性及软着陆过程动力学仿真研究[D].哈尔滨:哈尔滨工业大学,2013.
[12]S.K.Maiti,L.J.Gibson,M.F.Ashby. Deformation and energy absorption diagrams for cellular solids[J]. Acta Metallurgica,1984,32:1963-1975.