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     The deformation and internal stress distribution of radial tire under inflation and static load,as well as the pressure distribution in contact area are obtained by 3D nonlinear finite element analysis.
     通过三维非线性有限元分析得到了在充气压力和静负荷作用下子午线轮胎的变形、内部应力分布及接地区压力分布。
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     According to the theory of relative movement,the morphological changes,stress distribution and moulage distribution in the contacting region of each part of tyres in the static contacting process are obtained using Pilot node in controlling over rigid-target surface pressing the tyres,thus laying the foundation for the further dynamic contact analysis and structure optimal design for the radial tyres.
     根据相对运动的原理,使用Pilot节点控制刚性目标面压向轮胎,得到了在静态接触过程中轮胎各部位的形态变化、应力分布和接地区印迹分布,为进一步进行子午线轮胎的动态接触分析和结构优化设计奠定了基础。
短句来源
     The three-dimensional FEA has been carried out to analyse the contact performance of loaded tire.
     分析表明,侧倾与侧偏的联合作用改善了接地区应力分布的不均匀性,不仅可以提高轮胎接地性能,而且使轮胎在纯侧倾状态下的偏磨得以缓解,体现了侧倾和侧偏的相互补偿作用。
短句来源
     The result showed that at constant inflated pressure,the contact shape changed from circle to ellipse then in turn to rectangular. The stress distribution in contact area changed from inner higher and outer lower into inner lower and outer higher.
     结果表明 ,在一定的充气压力下 ,随着下沉量逐渐增大 ,轮胎接地形状从圆形逐渐变为椭圆形、矩形 ,接地区应力分布由内高外低逐渐变为内低外高 ;
短句来源
     The results showed that under a certain inflation pressure,th e high stress in the ground-contact area was shifted from the centre to the out erside as the deflection increased;
     结果表明 ,在一定充气压力下 ,随下沉量的增大 ,接地区应力分布由内高外低变为内低外高 ,发生翘曲现象 ;
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  impact area
The forests in the impact area were dominated by either Ceriops tagal or Rhizophora stylosa with Avicennia marinaas a subdominant in places.
      
C.tagal dominated forests within the impact area were relatively more severely affected (41.8% in the severe category) than R.stylosa dominated communities (only 17.4% in the severe category).
      
Given that many coral communities are open reproductive systems, the consequences of disturbance events are not likely to be restricted to the impact area.
      
The potential use of pyrolysis techniques for defining the impact area and the various types of inputs derived from off-shore drilling operations was demonstrated.
      
When the pad area is greater than the tup, forces are higher than predicted, unless an empirical factor is introduced to account for the nonuniaxial stretching of the ring of material that extends outside of the impact area.
      
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Finite element analysis model of 9.00 R 20 radial tire was built and the static stress-strain distribution in the contact area was analyzed.The material and geometric nonlinear properties, and the anisotropic property of composite materials as well as uncompressible property of vulcanized rubber were studied. The effects of quantity of deflection, inflated pressure and friction coefficient on stress distribution in the contacting area were analyzed.The result showed that at constant inflated pressure,the contact...

Finite element analysis model of 9.00 R 20 radial tire was built and the static stress-strain distribution in the contact area was analyzed.The material and geometric nonlinear properties, and the anisotropic property of composite materials as well as uncompressible property of vulcanized rubber were studied. The effects of quantity of deflection, inflated pressure and friction coefficient on stress distribution in the contacting area were analyzed.The result showed that at constant inflated pressure,the contact shape changed from circle to ellipse then in turn to rectangular. The stress distribution in contact area changed from inner higher and outer lower into inner lower and outer higher. Friction force was axisymmetrical and its quantity was not large on static contact condition. The stresses of tire cord and tire ring on contacting area were higher. Inflated pressure had effect on sinking of warpage. Sinking decreased with the increase of inflated pressure. The largest stress on contact area increased with the increase of inflated pressure.

建立了9.00R20子午线轮胎的有限元分析模型 ,从轮胎的材料非线性、几何非线性、橡胶帘线复合材料的各向异性 ,以及橡胶材料的不可压缩性等方面探讨了轮胎与地面的静态接触问题 ,分析了下沉量、充气压力及静摩擦系数等对轮胎静态接地面内应力应变场的影响。结果表明 ,在一定的充气压力下 ,随着下沉量逐渐增大 ,轮胎接地形状从圆形逐渐变为椭圆形、矩形 ,接地区应力分布由内高外低逐渐变为内低外高 ;静态接地时的摩擦力呈对称分布 ,但摩擦力并不大 ;带束层和胎圈在接地区域的应力较高 ,充气压力对发生翘曲时的下沉量有影响 ,随着充气压力的升高 ,对应的下沉量降低 ;下沉量相同时接地面内的最大应力随充气压力的升高而增大。

A FEA model of 9.00R20 radial tire was built bas ed on the practical sructure of 9.00R20 radial tire by using MARC General Code and taking the material nonlinearity,the geometric nonlinearity,the anisotropy o f composite and the elasticity of rubber itself into account.The model was used to investigate the influence of such factors as deflection,inflation pressure an d static friction coefficient on the static stress/strain distribution in the gr ound-contact area.The results showed that under a certain inflation...

A FEA model of 9.00R20 radial tire was built bas ed on the practical sructure of 9.00R20 radial tire by using MARC General Code and taking the material nonlinearity,the geometric nonlinearity,the anisotropy o f composite and the elasticity of rubber itself into account.The model was used to investigate the influence of such factors as deflection,inflation pressure an d static friction coefficient on the static stress/strain distribution in the gr ound-contact area.The results showed that under a certain inflation pressure,th e high stress in the ground-contact area was shifted from the centre to the out erside as the deflection increased;the friction force was small and distributed symmetrically in the static ground-contact area;the deflection decreased as th e inflation pressure increased;and under a certain deflection,the maximum stress in the ground-contact area increased as the inflation pressure increased.

根据 9.0 0R2 0子午线轮胎的实际结构 ,考虑了轮胎的材料结构非线性、几何非线性、复合材料各向异性以及橡胶材料本身的弹性等特性 ,运用MARC有限元通用程序 ,建立轮胎模型 ,分析了 9.0 0R2 0子午线轮胎静态下与地面的接触问题 ,考察了不同下沉量、内压及静摩擦因数等因素对轮胎静态接地面内应力应变场的影响。结果表明 ,在一定充气压力下 ,随下沉量的增大 ,接地区应力分布由内高外低变为内低外高 ,发生翘曲现象 ;静态接地时的摩擦力分布对称 ,但数值不大 ;随充气压力的升高 ,对应的下沉量下降 ,而在一定的下沉量下 ,接地面内的最大应力随充气压力的升高而增大。

To obtain a correct FEA model of tire structure,attention should be paid to the following problems:exactly describe and correctly input the material characteristics of rubber or rubber/cord composite;simulate the large deformation and contact area of tire with reasonable units;use 3D solid unit model and fine network near ground contact area to predict the local mechanical behaviour of tire.

介绍在进行轮胎有限元结构分析时建立正确的力学模型应注意的问题 :对于轮胎中的橡胶材料和橡胶 帘线复合材料 ,要准确描述和正确输入其材料特性 ;对于轮胎存在的大变形和接触问题 ,需采用合理的单元进行模拟 ;为预测轮胎的局部力学行为 ,应采用三维实体单元模拟 ,并在接地区附近采用细化网格

 
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