不同增强方向的带支柱体心立方点阵及其填充结构的压缩力学性能分析

Analysis of Compressive Mechanics Properties of Body Centered Cubic Lattice with Pillars in Different Reinforcement Directions and Their Filling Structures

为研究不同增强方向的带支柱体心立方点阵及其填充结构的压缩力学性能,制备了硅橡胶填充点阵结构试验件。通过试验和仿真方法研究了硅橡胶填充BCC1或BCC2(加载方向分别与带支柱体心立方点阵的支柱杆方向相同或垂直)两种点阵结构的压缩力学性能,并采用铁摩辛柯梁理论和极限载荷法分析了两种点阵结构的等效弹性模量和压缩平台应力。结果表明:提出的理论模型能够很好地预测两种点阵结构的等效弹性模量和压缩平台应力。经过填充后两种点阵结构的压缩强度和吸能性能均会得到增强,BCC2结构的增强效果更加显著。对于BCC1点阵结构,填充提高了其内部杆件的承载力;而对于BCC2点阵结构,填充减小了其“V”形剪切带附近的杆件弯曲变形。随着点阵结构半径的增大,两种结构的吸能耦合因子均先增大后减小,而BCC1型结构的吸能耦合因子变化更明显。

To study the compressive mechanics properties of pillar centered cubic lattice with different reinforcement directions and their filling structures,silicone rubber filled lattice structure test specimens were prepared herein.The compressive mechanics properties of two lattice structures(BCC1 or BCC2,loading direction was either the same or perpendicular to the direction of pillar rod in body centered cubic lattice with pillars)filled with silicone rubber were studied through experimental and simulation methods.The equivalent elastic modulus and compressive platform stress of two lattice structures were conducted using Timoshenko beam theory and ultimate load method.The results indicate that the proposed theoretical model may effectively predict the equivalent elastic modulus and compressive platform stress of two type lattice structures.After filling,the compression strength and energy absorption performance of the two lattice structures are enhanced,while the enhancement effect of the BCC2 structure is more significant.For the BCC1 lattice,rubber filling enhances the bearing capacity of the internal members.However,for the BCC2 lattice structure,rubber filling reduces the bending deformation of the members near the V-shaped shear band.As the radius of the lattice structure increases,the energy absorption coupling factors of both lattice structures first increase and then decrease,yet the energy absorption coupling factor of BCC1 type structure changes more significantly.