【作者】 徐尚龙；

【导师】 薛河；

【作者基本信息】 西安科技大学 ， 机械设计及理论， 2003， 硕士

【摘要】 矿井提升机主轴的断裂有可能造成重大经济损失和人员伤亡，为了研究其使用安全性，本文以数值模拟技术为手段，分别就各种工况下的提升机主轴应力应变场，裂纹形成阶段和含横向裂纹主轴的裂纹扩展阶段的疲劳寿命，以及含纵向裂纹主轴的裂纹扩展驱动力参量进行了较全面的分析和研究，为矿井提升机主轴完整性评价标准的建立奠定了一定的理论基础。 本研究探讨了利用ANSYS软件分析机械构件疲劳寿命和三维模型断裂参量K和J积分的方法，为提升机主轴的疲劳分析和断裂性能研究提供了一种重要手段。 本研究对各种工况下主轴的应力应变场进行数值模拟分析，并对主轴应力集中区域的力学性能进行了分析和研究，为进一步的疲劳分析提供了依据。 进行了主轴裂纹形成阶段疲劳寿命的数值解法的研究，编制出寿命估算的ANSYS命令流。 针对提升机主轴外形为圆弧状且含表面裂纹，提出了“化圆为方”方法将其转化为方形结构，减小了建立含表面裂纹主轴有限元模型的难度。通过对有限元模型中“化圆为方”的研究表明，利用等实常数原则将含表面裂纹的轴转化为截面为矩形的结构，得出的应力分布和疲劳寿命基本接近，表明该转化方法的可靠性，并通过数值计算得出不同裂纹长度的主轴疲劳寿命。 利用ANSYS中子模型技术对含纵向裂纹主轴的裂尖应力场和断裂参量K和J进行了分析，得出裂纹位于轴的中心时，裂纹尖端区并未表现明显的应力集中，裂纹位置靠近轴表面时裂纹尖端应力集中较明显，且应力强度因子K和J积分值相应增大。更多还原

【Abstract】 The economical loss and personal casualties will be given rise when mine winder axle fractured. In view of the importance of working safety, the stress-strain field in several working condition, the life of fatigue crack deforming and the life of transverse crack developing and the parameters of crack driving force containing longitudinal crack is studied in detail in this thesis. Theoretical basis of integrity evaluation criterion of mine winder axle is established to certain extent.Finite element numerical solution of fatigue life of mechanical member and of stress intensity factor K and J-integral for 3D model is approached with ANSYS software. An important method is made for the fatigue analysis and fatigue performance of winder axle.The stress-strain field of winder axle in various working conditions is analyzed and mechanics performance of stress concentration region is studied, which provides reference for its fatigue analysis.Numerical solution of the life of fatigue crack deforming is undertaken and ANSYS order flow of fatigue life is obtained.According to arc profile and feature of surface crack, the approach of "circularity transformed to square" is brought forward, which makes the finite computation module of winder axle containing surface crack simplify. It is indicated from the approach of "circularity transformed to square" about finite element module that stress distribution and fatigue life of the axis containing surface crack and square structure in equal real constant are in the same range, which is the evidence of reliability of the means. Moreover, fatigue life with various crack depth is gained by numerical computation.It is indicated from research of the stress-strain field and fracture parameter including K and J-integral of winder axle by the submodel technique of ANSYS that stress concentration is not explicit in crack tip region when longitudinal crack located in centre line and is evident when close to surface is obtained. The fracture parameters such as stress intensity factor K and J-integral become larger when the location is more closely to surface.更多还原