【摘要】 利用有限元软件ABAQUS建立带缺陷孔的车轮二维有限元模型,循环塑性本构关系采用LemaitreChaboche非线性各向同性/随动硬化循环塑性模型,通过在滚动接触表面上施加移动法向分布压力和切向分布力模拟反复滚动过程。采用Jiang-Sehitoglu损伤参量和基于临界平面法的疲劳裂纹萌生寿命模型,分析循环载荷大小、缺陷孔深度和摩擦因数等因素对车轮缺陷孔处损伤参量及滚动接触疲劳裂纹萌生寿命的影响规律。结果表明:经过反复施加10次循环载荷,车轮材料缺陷孔处应力应变响应逐渐趋于稳定。循环载荷大小、缺陷孔深度和摩擦因数等因素对车轮缺陷孔处损伤参量和滚动接触疲劳裂纹萌生寿命的影响比较明显。疲劳裂纹萌生寿命随着循环载荷与摩擦因数的增加而增大,随着缺陷孔深度的增加而逐渐减小。更多还原

【Abstract】 A 2-D finite element model of the wheel with a defect hole was established by finite element software ABAQUS.The Lemaitre-Chaboche nonlinear isotropic/kinematic hardening cyclic plastic model was used for the cyclic plastic constitutive relation to simulate the repeated rolling contact of the wheel through the moving normal distribution pressure and tangential distribution force applied on the rolling contact surface.The JiangSehitoglu damage parameters and the critical plane approach based fatigue crack initiation life model were used to analyze the influence of the factors such as cyclic loading,the depth of defect hole and friction factor on the damage parameters of wheel defect hole and the rolling contact fatigue crack initiation life.The results showed that after repeated cyclic loading for ten times,the stress and strain response of the defect hole of the wheel material gradually stabilized.The effects of the factors such as cyclic loading,the depth of the defect hole and the friction factor on the damage parameters of the wheel defect hole and the rolling contact fatigue crack initiation life of the wheel were obvious.The fatigue crack initiation life increased with the increase of the cyclic load and friction factor while decreased with the increase of the depth of the defect hole.更多还原