新型负泊松比非充气轮胎设计及性能分析

Structural design and performance analysis on novel airless tire with negative Poisson’s ratio characteristic

该文提出一种新型负泊松比非充气轮胎支撑体结构,由三层凹四边形微结构组成,具有“压缩-收缩”的负泊松比特性。建立新型凹四边形负泊松比非充气轮胎有限元模型,采用3D打印技术制造样件,进行沉降-载荷实验,以验证有限元模型的准确性。通过ANSYS软件对不同支撑体结构参数的负泊松比非充气轮胎进行仿真分析,获得轮胎的应力水平和刚度特性,并选出性能最优的结构参数。与同规格下的六边形蜂窝非充气轮胎进行仿真对比分析,结果表明,新型负泊松比非充气轮胎在应力水平、刚度特性和侧向稳定性方面有较大提升,其最大应力减小4.81%,径向刚度增大4.70%,侧向刚度增大7.12%。通过3D打印制造出同比例缩小的三维样件,并与六边形蜂窝轮胎进行对比分析,获得2类轮胎的实验沉降-载荷曲线。结果表明,在相同应变下,负泊松比非充气轮胎承受载荷时对塑性变形的抵抗力较大,承载性能较好。

A novel support structure composed of three-layer concave quadrilateral cellular structure with the characteristic of“compression-contraction”negative Poisson’s ratio is put forward through innovative design of an airless tire.A finite element model of a new type of concave quadrilateral negative Poisson’s ratio airless tire is established,and 3D printing technology is utilized to manufacture samples for settlement-load test in order to verify the reasonability of the finite element model.The negative Poisson’s ratio airless tire with different support structural parameters is simulated and analyzed by ANSYS software,the stress level and stiffness characteristics of the tire are obtained,and the structural parameters with the best performance are selected.Compared with the hexagonal honeycomb airless tire of the same specification,the simulation results indicate that the performances of negative Poisson’s ratio airless tire are greatly enhanced in terms of stress level,stiffness and lateral stability,with the maximum stress reduced by 4.81%,the radial stiffness increased by 4.70%,and the lateral stiffness increased by 7.12%,respectively.The reduced three-dimensional samples with the same proportion are manufactured by 3D printing,and compared with hexagonal honeycomb tire,the experimental settlement-load curves of two types of tires are obtained.The results indicate that airless tires with negative Poisson’s ratio have greater resistance to plastic deformation and better load-bearing performance in comparisons with the hexagonal honeycomb tire under the same strain.