由折痕构建的扭转-吸能结构的形变与力学行为研究

Deformation and Mechanical Behavior of Torsional Energy Absorbing Structures Constructed by Folding Creases

折纸结构在过去几年里受到了广泛关注,所发展出的折纸几何学成为现代几何学的一个分支。与传统的面片折纸结构设计方法不同,尝试使用折纸结构中的折痕来构建出一种新的手性机械超材料桁架结构,并作为一种通过扭转变形而吸收能量的装置。通过实验、理论计算以及有限元模拟方法,研究不同的几何设计参数对该机械超材料结构扭转变形和力学响应的控制规律,并进一步探究在压缩过程中,有接触和无接触式结构不同的能量吸收特性。结果表明,增大高度或减小桁架结构半径参数可以增大结构的扭转角;减小高度、初始角或增大桁架边数参数可以增大结构的弹性模量;减小高度、初始角或增大桁架结构半径,桁架结构边数等参数可以引入负刚度;减小高度、初始角、桁架半径或增大桁架边数参数可以增大结构的吸能效果。所提出的新型机械超材料结构,有望应用在航天航空、机械工程、汽车制造等领域。

Origami structures have received wide attention in the past few years,and the developed origami geometry has become a branch of modern geometry.Different from the traditional origami design method using facets,the proposed mechanical metamaterial truss structures with the creases in origami structures are used as new torsional energy absorption devices.The effects of different geometric design parameters on the torsional deformation and mechanical responses of the mechanical metamaterial structures are investigated based on experiments,theoretical and finite element simulation methods,and the different energy absorption properties of contact and non-contact structures during compression are further explored.Results show that the structural torsion angle can be increased by increasing the height or decreasing the radius of the truss structure.The Young’s modulus of the structure can be increased by decreasing the height,increasing the initial angle or increasing the side number of truss structure.Negative stiffness can be introduced by decreasing the height and the initial angle or increasing the radius of the truss structure and the side number of truss structure.Reducing the height,initial angle,radius of truss or increasing the side number can increase the value of energy absorption.The proposed mechanical metamaterial structures are expected to be applied in the fields of aerospace,mechanical engineering,automobile manufacturing and so on.