摘要
基于显式非线性有限元数值仿真分析方法,建立不同构型等壁厚加筋正六角铝蜂窝的全尺度精细离散模型,对比不同形式加筋蜂窝低速10m/s异面加载时力学特性的变化,评估出双筋加筋形式强于单筋形式,双厚强于单厚的加筋构型。研究加筋板厚度与蜂窝胞元壁厚间的匹配效应,通过改变筋板厚度,分析加筋板厚对蜂窝整体屈曲模式的影响,并采用等效表观密度特征因子评价加筋蜂窝的屈曲模式改变对整体力学特性影响的贡献度,发现筋胞匹配间存在明显的"分离点",当所加筋板小于一定厚度时,加筋蜂窝的平台区平齐、完整,但随厚度增加,其响应特性突变,平台区波动剧增,超出此厚度比例构造的加筋型蜂窝其功用将受到影响;1.5倍胞壁厚加筋的蜂窝力学性能稳定,平台强度提升显著,是最优的筋厚选择方案。
Based on explicit nonlinear finite element numerical simulation analysis method, series full-scale elaborator models of regular hexagon aluminum honeycomb with different geometric configurations reinforced with the same cell-wall thickness and ribs were constructed, and their mechanical properties impact at 10m/s were obtained. The comparisons between mechanical properties told out that the double-rib configuration is superior to the single-rib one, and the double-thickness configuration is superior to the single-thickness one. Afterwards, the thickness matching effect between rib and cell-wall was studied to word kinds of rib thickness combination. The influence of the rib thickness to the general buckling model was analyzed with equivalent apparent density index to evaluate the contri- bution of the deformation model change to the general mechanical properties. There is an obvious ＂turning point＂, when the rib thick ness smaller than that, the reinforced honeycomb performs a stably and perfectly at plateau stage, but with the increasing of the thick ness, the response property changes abruptly with drastic waves. The load bearing capacity and energy-absorbing ability of the reinforced honeycomb with former proportion must drop. On the whole, the 1.5 times of the rib thickness to that of cell-wall is the most op timal option for reinforced honeycomb because of its excellent performance and significant promotion on plateau stress.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2013年第3期86-91,共6页
Journal of Aeronautical Materials
基金
中南大学中央高校基本科研业务费专项资金资助(2012zzts015)
教育部博士研究生学术新人奖资助
国家自然科学基金项目(51275532)
湖南省科技计划项目资助(2011RS4062)
关键词
铝蜂窝
加筋
力学特性
匹配效应
aluminum honeycomb
reinforcement
mechanical property
matching effect
