典型轮胎非均匀接触应力获取及其作用下的路面TDC开裂分析
发布时间：2018-12-27 13:55
【摘要】：我国的沥青路面设计规范采用双圆均布静态荷载来假定车辆荷载,忽略了车辆荷载分布的非均匀性,而将沥青路面假设为多层弹性体系,忽略了沥青路面的粘弹性。同时,随着沥青上面层的不断增厚,沥青路面的TDC开裂不断增多,因此,需要研究胎路作用的接触对于TDC开裂所具有的影响。首先,基于ABAQUS软件,考虑轮胎的组成材料的本构关系、轮胎帘布的各向异性以及轮胎变形的非线性,分析材料属性方向、轮胎网格划分以及接触属性等对于轮胎有限元模型收敛性的影响。其次,基于ABAQUS/Explicit隐式动态分析,分析轮胎的速度与加速度对于轮胎的三向接地应力(竖向接地应力、横向接地应力、纵向接地应力)的影响,研究不同花纹、不同胎压、不同荷载的轮胎在不同工况下的三向接地应力分布以及最大值的关系,并通过实测相验证。接着,通过ABAQUS后处理输出程序,提取复杂花纹轮胎与刚性路面在不同运动工况下(牵引工况、自由滚动工况以及制动工况)的的三向接地应力并建立某种典型的沥青粘弹性路面模型,该模型包含有上面层、中面层、下面层、半刚性基层以及土基层。通过ABAQUS DLOAD子程序将提取的三向接地应力作用于沥青路面模型上,考虑影响沥青路面TDC开裂病害的力学因素,分析沥青路面在复杂花纹轮胎荷载作用下,不同运动工况上面层三向应力分布情况。分析结果表明,轮胎的制动和牵引会影响沥青路面的TDC开裂,主要影响指标是纵向剪切应力。最后,以沥青路面TDC开裂的受力分析为基础,分析路面各层位移、应变、应力响应情况。
[Abstract]:The design code of asphalt pavement in our country assumes the vehicle load by double circular uniform static load and neglects the non-uniformity of vehicle load distribution. The asphalt pavement is assumed to be a multi-layer elastic system and the viscoelasticity of asphalt pavement is neglected. At the same time, with the continuous thickening of the asphalt layer, the TDC cracking of asphalt pavement is increasing. Therefore, it is necessary to study the effect of the contact of the tread on the TDC cracking. First of all, based on ABAQUS software, considering the constitutive relation of tire material, the anisotropy of tire cord and the nonlinearity of tire deformation, the material property direction is analyzed. The effects of tire mesh generation and contact properties on the convergence of tire finite element model. Secondly, based on the implicit dynamic analysis of ABAQUS/Explicit, the effects of tire speed and acceleration on the three direction ground stress (vertical ground stress, transverse ground stress, longitudinal ground stress) of tire are analyzed, and different patterns and tire pressures are studied. The relationship between the distribution of three-way ground stress and the maximum value of tire under different loads is verified by the measured results. Then, through the ABAQUS post-processing output program, the complex pattern tire and the rigid pavement are extracted under different moving conditions. A typical model of asphalt viscoelastic pavement is established, which includes upper layer, middle surface layer, lower layer, semi-rigid base and soil base. Through ABAQUS DLOAD subroutine, the extracted three-way ground stress is applied to the asphalt pavement model. Considering the mechanical factors affecting the TDC cracking of asphalt pavement, the paper analyzes the asphalt pavement under the complex pattern tire load. Three dimensional stress distribution of the upper layer under different moving conditions. The results show that the braking and traction of tire will affect the TDC cracking of asphalt pavement, and the main index is longitudinal shear stress. Finally, based on the stress analysis of asphalt pavement TDC cracking, the displacement, strain and stress response of each layer of asphalt pavement are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
本文编号：2393172
[Abstract]:The design code of asphalt pavement in our country assumes the vehicle load by double circular uniform static load and neglects the non-uniformity of vehicle load distribution. The asphalt pavement is assumed to be a multi-layer elastic system and the viscoelasticity of asphalt pavement is neglected. At the same time, with the continuous thickening of the asphalt layer, the TDC cracking of asphalt pavement is increasing. Therefore, it is necessary to study the effect of the contact of the tread on the TDC cracking. First of all, based on ABAQUS software, considering the constitutive relation of tire material, the anisotropy of tire cord and the nonlinearity of tire deformation, the material property direction is analyzed. The effects of tire mesh generation and contact properties on the convergence of tire finite element model. Secondly, based on the implicit dynamic analysis of ABAQUS/Explicit, the effects of tire speed and acceleration on the three direction ground stress (vertical ground stress, transverse ground stress, longitudinal ground stress) of tire are analyzed, and different patterns and tire pressures are studied. The relationship between the distribution of three-way ground stress and the maximum value of tire under different loads is verified by the measured results. Then, through the ABAQUS post-processing output program, the complex pattern tire and the rigid pavement are extracted under different moving conditions. A typical model of asphalt viscoelastic pavement is established, which includes upper layer, middle surface layer, lower layer, semi-rigid base and soil base. Through ABAQUS DLOAD subroutine, the extracted three-way ground stress is applied to the asphalt pavement model. Considering the mechanical factors affecting the TDC cracking of asphalt pavement, the paper analyzes the asphalt pavement under the complex pattern tire load. Three dimensional stress distribution of the upper layer under different moving conditions. The results show that the braking and traction of tire will affect the TDC cracking of asphalt pavement, and the main index is longitudinal shear stress. Finally, based on the stress analysis of asphalt pavement TDC cracking, the displacement, strain and stress response of each layer of asphalt pavement are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
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