基于Pamcrash的蜂窝铝异面压缩仿真与验证
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摘要
为了得到与实验一致性较好的蜂窝铝有限元模型,利用Hypermesh和Pamcrash软件联合仿真,以软件材料库中105号壳单元为基础,建立了蜂窝铝模型,模拟蜂窝铝异面匀速压缩过程;通对比触发力、平台力、吸能量和压实应变,验证仿真模型。对比结果表明,仿真模型与实验试件的主要变形模式相同,仿真数据与实验数据吻合。在考察蜂窝铝异面压缩吸能能力的情况下,所建立的蜂窝铝有限元模型能够代替实验试件,进行研究与设计。
To reach good agreements between the test specimen and the finite element model of aluminum honeycomb,the Hypermesh and Pamcrash computer program are used. Based on the material 105 in Pamcrash program,the finite element model of aluminum honeycomb is built by the shell element to simulate the out-of-plane crushing behavior with a constant impact velocity. The finite element model is verified by comparing the trigger force,the platform force,the energy absorption,and the compaction strain. The comparison results show that the simulation model has the same main deformation mode as the test specimen,and the simulation data is consistent with the test. The finite element model of honeycomb aluminum can be used to replace the experimental specimen for research and design when investigating the energy absorption capacity of honeycomb aluminum.
To reach good agreements between the test specimen and the finite element model of aluminum honeycomb,the Hypermesh and Pamcrash computer program are used. Based on the material 105 in Pamcrash program,the finite element model of aluminum honeycomb is built by the shell element to simulate the out-of-plane crushing behavior with a constant impact velocity. The finite element model is verified by comparing the trigger force,the platform force,the energy absorption,and the compaction strain. The comparison results show that the simulation model has the same main deformation mode as the test specimen,and the simulation data is consistent with the test. The finite element model of honeycomb aluminum can be used to replace the experimental specimen for research and design when investigating the energy absorption capacity of honeycomb aluminum.
引文
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[2]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.
[3]孙德强,张卫红.双壁厚蜂窝铝芯的共面冲击力学性能[J].振动与冲击,2008(7):69-74+187.
[4]车全伟,姚曙光,肖娴靓.蜂窝轴向压缩实验与仿真分析方法研究[J].铁道科学与工程学报,2017,14(5):1049-1055.
[5]徐天娇.六边形铝蜂窝力学行为的尺寸效应研究[D].太原:太原理工大学,2013.
[6]马思群,郝月,孙彦彬,等.六边形蜂窝铝异面动态冲击仿真研究[J].机械设计与制造工程,2018,47(8):18-22.
[7] Deqiang S,Weihong Z,Yanbin W. Mean out-of-plane dynamic plateau stresses of hexagonal honeycomb cores under impact loadings[J]. Composite Structures,2010,92(11):2609-2621.
[8]唐爽.铝蜂窝静动态压缩行为研究[D].长沙:中南大学,2014.
[9] A Paul,U Ramamurty.Strain rate sensitivity of a closed-cell aluminum foam[J].Materials Science&Engineering A,2000,281(1):1-7.