结构参数对自相似多级蜂窝力学性能的影响
发布时间：2019-06-06 15:26
【摘要】：对蜂窝的代表性体积单元(RVE)研究发现,相比于均匀化边界条件,周期性边界条件能更好地预测蜂窝的等效力学性能。基于周期性边界条件,对自相似多级蜂窝进行面内不同方向的拉伸模拟,重点分析了蜂窝孔隙率与多级长度比对拉伸性能的影响。结果表明:自相似多级蜂窝在拉伸过程中会呈现面内各向异性,沿扶手椅方向拉伸时,会在节点六边形的水平连接边处发生断裂;沿锯齿形方向拉伸时,当节点六边形的边长大于壁厚和节点六边形的连接斜边的边长较长的情况下,蜂窝会出现两次拉伸破坏,分别在节点六边形边与节点六边形的连接斜边处,而在其他情况下,则只会在节点六边形连接斜边处发生一次破坏。并且自相似多级蜂窝随着孔隙率或长度比的增大,蜂窝拉伸强度呈现减小的趋势。
[Abstract]:The representative volume element (RVE) of honeycomb is studied. it is found that the periodic boundary condition can predict the equivalent mechanical properties of honeycomb better than the homogenized boundary condition. Based on the periodic boundary condition, the tensile simulation of self-similar multistage honeycomb in different directions is carried out, and the effect of the ratio of porosity to multistage length on the tensile properties of the honeycomb is analyzed in detail. The results show that the self-similar multistage honeycomb will show in-plane anisotropy in the tensile process, and when stretching along the armchair direction, it will break at the horizontal joint edge of the hexagonal joint of the node. When stretching along the zigzag direction, when the side length of the joint hexagonal is larger than the wall thickness and the side length of the joint oblique edge of the node hexagonal is longer, the honeycomb will appear twice tensile failure. At the oblique edge of the connection between the hexagonal edge of the node and the hexagonal edge of the node, but in other cases, it will only be destroyed once at the oblique edge of the hexagonal connection of the node. The tensile strength of self-similar multistage honeycomb decreases with the increase of porosity or length ratio.
【作者单位】： 南昌航空大学航空制造工程学院;
【基金】：国家自然科学基金(11372126)
【分类号】：TB383.4
本文编号：2494408
[Abstract]:The representative volume element (RVE) of honeycomb is studied. it is found that the periodic boundary condition can predict the equivalent mechanical properties of honeycomb better than the homogenized boundary condition. Based on the periodic boundary condition, the tensile simulation of self-similar multistage honeycomb in different directions is carried out, and the effect of the ratio of porosity to multistage length on the tensile properties of the honeycomb is analyzed in detail. The results show that the self-similar multistage honeycomb will show in-plane anisotropy in the tensile process, and when stretching along the armchair direction, it will break at the horizontal joint edge of the hexagonal joint of the node. When stretching along the zigzag direction, when the side length of the joint hexagonal is larger than the wall thickness and the side length of the joint oblique edge of the node hexagonal is longer, the honeycomb will appear twice tensile failure. At the oblique edge of the connection between the hexagonal edge of the node and the hexagonal edge of the node, but in other cases, it will only be destroyed once at the oblique edge of the hexagonal connection of the node. The tensile strength of self-similar multistage honeycomb decreases with the increase of porosity or length ratio.
【作者单位】： 南昌航空大学航空制造工程学院;
【基金】：国家自然科学基金(11372126)
【分类号】：TB383.4
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1 汪越胜,章梓茂,王铎;界面超高速自相似动态分层分析:反平面情况[J];固体力学学报;1997年02期
，本文编号：2494408
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