Mechanical properties of the three-dimensional compression-twist cellular structure
Mechanical properties of the three-dimensional compression-twist cellular structure
复制标题
三维压缩扭转蜂窝结构的力学性能
DOI：
10.1177/0731684419888588
复制
发表时间：
2019
影响因子：
3.1
通讯作者：
Han Xiao
中科院分区：
文献类型：
--
作者：
Zhang Wei;Bai Xiaoyu;Hou Bowen;Sun Yadong;Han Xiao
由于其可变的细胞形状，细胞结构可以表现出许多特殊的机械行为。基于二维手性细胞结构的旋转机制，开发了一种三维压缩扭曲细胞结构，该结构在轴向压缩下发生扭曲变形。三维压缩扭转泡孔结构的形状由泡孔角度、泡孔长度和厚度比决定。利用梁理论推导了有效杨氏模量、泊松比和扭转角的解析表达式，与有限元计算吻合较好，并讨论了单元的变形过程。为了研究单元几何参数对力学性能的影响，建立了压缩扭转单元结构的有限元分析模型，该模型显示了压缩下的弹塑性变形过程。充分讨论了泡孔角度、泡孔长度和厚度比的影响，表明泡孔角度对相对扭转角具有明显的非线性影响，并能使其变硬。最后，通过三维打印制作压缩扭转细胞结构样品，并进行面内压缩实验来验证解析和有限元分析结果。
The cellular structure can exhibit many special mechanical behaviors due to its variable cell shape. A three-dimensional compression-twist cell structure based on the rotation mechanism of two-dimensional chiral cell structure is developed, which has twist deformation under axial compression. The shape of three-dimensional compression-twist cell structure is determined through cell angle, cell length, and thickness ratio. Analytical expressions of effective Young’s modulus, Poisson’s ratio, and twist angle are derived by using beam theory, which have a good agreement with the finite element calculations and the deformation process of the cell is discussed. To work on the effect of geometric parameters of cell on the mechanical properties, a finite element analysis model of compression-twist cell structure is carried out, which shows the process of elastic and plastic deformation under compression. Effects of cell angle, cell length, and thickness ratio are fully discussed, which indicate that cell angle has obvious nonlinear effect on relative twist angle and could stiffen it. Finally, a compression-twist cell structure sample is made through three-dimensional printing, and an in-plane compressive experiment is carried out to prove analytical and finite element analysis results.