张拉整体超材料准静态压缩力学性能实验研究

Experimental study on mechanical properties of tensegrity metamaterials under quasi-static compression

为分析具有新颖结构形式的张拉整体超材料力学特性,利用增材制造技术,基于宏观尺度设计并制作了不同结构参数的张拉整体超材料实验模型,对其进行单轴准静态压缩实验.结果表明:准静态压缩载荷下,张拉整体超材料的变形分布均匀,应力应变曲线具有稳定的大变形平台段;增大相对密度可以提高张拉整体超材料的平均应力和吸能水平;增加杆件特征角度能提高结构的平均应力,但是会使得结构密实化应变减小;密度梯度张拉整体超材料在高应变下的承载能力和吸能能力优于非密度梯度结构.

To study the mechanical properties of tensegrity metamaterial with novel structural forms,an experimental model of tensegrity metamaterials with different structural parameters was designed and fabricated based on the macroscopic scale using additive manufacturing technology,and uniaxial quasi-static compression experiments were carried out.Results show that the deformation distribution of the tensegrity metamaterials is uniform and the stress-strain curves have stable large deformation plateau stage under quasi-static compression.The average stress and energy absorption capability of tensegrity metamaterials improved with the increase of relative density.The average stress increases with the increase of bar feature angle,but the densification strain of the structure can be reduced.The load-bearing capacity and energy-absorbing capacity of the density-gradient tensegrity metamaterials are better than those of the uniform structures under high strain.