微晶格穹顶拓扑结构锚杆托板吸能特性研究

Study on energy absorption characteristics of anchor support plate with microlattice dome topology

为了解决锚杆托板难以适应围岩冲击作用而出现过载弯折、变形、撕裂等问题,提出了1种用拉伸微晶格填充穹顶实体部分的新概念,将穹顶结构与四面体晶格相结合,得到了1种新型托板-微晶格穹顶结构托板。通过数值模拟软件Abaqus设置了3种可3D打印的材料,即Q235钢、ABS塑料、铝合金,在不同材料的基础上赋予托板截面不同的圆形剖面尺寸,即直径为1、2、3 mm,进行有限元对比分析。分析结果表明:不同剖面尺寸下3种材料的承载力和能量吸收的大小顺序为直径3 mm Q235钢>铝合金>ABS塑料,其中Q235钢的承载力约为4.26×10^(5)N,能量吸收约为2.2×10^(5)J,具有高强及高吸能特性;新型托板在材料为Q235钢,剖面直径为3mm时,承载力最大,吸能效果最强,为此数值模拟的最优结果。

In order to solve the problems such as overload bending,deformation and tearing caused by the rock bolt bracket which is difficult to adapt to the impact of surrounding rock,a new concept of filling the solid part of the dome with tensile microlattice was proposed.By combining the dome structure with tetrahedral lattice,a new bracket-microlattice dome structure bracket was obtained.Through the numerical simulation software Abaqus,three kinds of 3D-printable materials,namely Q235 steel,ABS plastic and aluminum alloy,were set,and different circular section sizes were given on the basis of different materials,namely the diameters of 1 mm,2 mm and 3 mm,for finite element comparative analysis.The results show that the carrying capacity and energy absorption of the three materials under different profile sizes are in the order of 3 mm Q235 steel>aluminum alloy>ABS plastic.The carrying capacity of Q235 steel is about 4.26×10^(5) N,and the energy absorption is about 2.2×10^(5) J,showing high strength and high energy absorption characteristics.When the material of the new bracket is Q235 steel and the section diameter is 3 mm,the bearing capacity is the highest and the energy absorption effect is the strongest,this is the optimal result of numerical simulation.