【作者】 王浩；

【导师】 王友善；

【作者基本信息】 哈尔滨工业大学 ， 工程力学， 2008， 硕士

【摘要】 轮胎是汽车承载的主要部件,其结构主要是由橡胶材料构成的,橡胶材料超弹性本构模型的选择和材料常数的准确性对有限元分析的结果起到决定性的作用。本文对多种超弹性本构模型进行对比并结合工程实际选择了Mooney-Rivlin模型、Neo-Hookean模型和Yeoh模型做重点研究。采用单向拉伸实验测得胎冠胶、胎侧胶、胎肩垫胶、钢丝夹胶、内衬层胶、上三角胶、下三角胶、子口护胶、钢丝包胶等九种轮胎纯橡胶部分的应力应变曲线并通过计算得到每种材料的5%定伸切线模量。根据拉伸实验数据和超弹性的基本理论获得三种超弹性本构模型的材料常数。建立相应的输入的接口程序,将本文中的三种超弹性模型引入了TYSYS和ANSYS结构分析软件中,采用不同超弹性模型进行了轮胎的充气分析,研究了欠压、常压、超压等不同充气压力下轮胎充气外直径和断面宽度变化,分析了不同超弹性模型的计算结果并和实验结果作了对比。借助ANSYS软件建立了三维刚性轮辋和刚性地面模型,研究了轮胎与轮辋接触状态下低于30mm下沉量时轮胎断面形状变化。针对橡胶材料采用Yeoh模型和定伸切线模量时下沉量与载荷关系的对比研究。研究了基于Yeoh模型的轮胎与轮辋和地面接触部位法向力和切向力的分布。分析了轮胎接触状态下胎冠胶剪应力与剪应变分布。本文研究了轮胎分析中的橡胶超弹性本构模型,考查了材料模型对计算结果的影响,为提高轮胎结构分析的精度提供支持。研究了基于超弹性本构模型的轮胎力学性能,为轮胎结构的优化设计提供依据。更多还原

【Abstract】 Tire is an important bearing part of automobile, which is mainly composed of rubber. The choice of the hyper-elastic constitutive models and the accuracy of the material constants play a decisive role for the finite element analysis.In this paper, a variety of hyper-elastic models are compared. The Mooney-Rivlin, Neo-Hookean and Yeoh model are choosed according to actual condition. Stress-strain curves of tread rubber, sidewall rubber, shoulder rubber, wire’s filling rubber, inner liner rubber, upper apex rubber, lower apex rubber, toe and heel rubber and steel wire’s wrap rubber are obtained by peformed uniaxial tension test. And then the tangent modulus at definite elongation are gotten. The material constants of the three kinds of hyper-elastic models are obtained according to the uniaxial test data and the basic hyper-elastic theory.A corresponding interface program is built with introduce the three kinds of hyper-elastic constitutive models to TYSYS and ANSYS by that. Inflation analysis of the tyre with diffent material models are performed by using ANSYS. The overall diameter and the section width are investigated under the underpressure, normalpressure and overpressure. The results are compared with the experiments.The three-dimensional rigid rim and road model are bulit by using ANSYS. The shape changing of the section, the deformation of the position of the ryre-rim contact are investigated in the state of less than 30mm tyre center sinking under rim-tyre-road contact condition. The sinking-loading curves by using Yeoh model and the tangent modulus at definite elongation are compared. The distribution of normal stress and the tangential stress of rim-tyre-road contact position are studied. The shear stress and strain distribution of tread position are investigated.Hyperelastic constitutive models in tyre analysis, and the influence of them to the calculation accuracy are studied in this paper, which provides support to the accuracy of tyre structure analysis. The mechanical properties of the tire based on hyperelastic constitutive models are studied, which is important to the optimization design of the radial tire.更多还原