驱动桥半轴回收件极限裂纹参数评估技术研究

发布时间：2018-06-23 17:42

本文选题：驱动桥半轴 + 回收件　；参考：《广西大学》2017年硕士论文

【摘要】：本文针对某装载机传动系驱动桥半轴可再制造评估问题,研究了半轴有限元模型中的最恶加载位置,及在最恶加载位置半轴花键齿根裂纹缺陷的引入方法;还根据非线性接触有限元理论和Miner疲劳分析理论,在寿命评估的基础上,探索半轴回收件可用于再制造检测回收所能允许的最大裂纹极限参数的判据。主要研究内容包括:1依据半轴花键齿渐开线的描述形式,利用UG建模功能创建精确的三维模型,为下文有限元分析确定其最恶加载位置及齿根裂纹的引入打下基础。2为了得到半轴强度应力大小及分布情况,本文采用非线性接触有限元理论来分析获得最恶加载位置条件下半轴最大等效应力的分布情况,然后根据Lewicki提出的裂纹扩展路径简化裂纹模型,依照J.Kramberger提出的齿根应力最大点位置(ψ= 300～340),在该位置引入裂纹模型并进行有限元分析。3通过对半轴的材料结构特性及应力集中、表面情况、尺寸效应和加载情况进行分析得到半轴的S-N曲线。在此基础上分析某装载机典型作业工况,利用变幅载荷来分析疲劳强度。为了得到某装载机半轴载荷应力谱,运用概率统计法和“3σ”法则来计算变幅载荷的正态分布情况。根据Miner疲劳分析理论,结合半轴的S-N曲线及载荷谱对半轴回收件进行疲劳寿命分析,结合不同载荷条件下裂纹应力变化规律,通过反推法推出最大疲劳应力值,最后对比分析获得齿根裂纹极限参数值。4初步建立了半轴回收件极限裂纹的判断方法,为半轴再制造件及其他再制造零部件的使用提供参考。
[Abstract]:In this paper, aiming at the remanufacturing evaluation problem of the semi axle of the driving axle of a loader, the worst loading position in the semi axial finite element model and the introduction of the crack defect of the semi axis spline tooth root in the worst loading position are studied. On the basis of the nonlinear contact finite element theory and the Miner fatigue analysis theory, the study is based on the life evaluation. The semi axle recovery part can be used for the criterion of maximum crack limit parameters that can be allowed in remanufacturing. The main contents include: 1 according to the description form of the semi axle spline involute, a precise three-dimensional model is created using the UG modeling function, and the following finite element analysis is used to determine the worst loading position and the introduction of the root crack. Based on the nonlinear contact finite element theory, the distribution of the maximum equivalent stress of the semi axle under the condition of the most bad loading is obtained by using the nonlinear contact finite element theory to obtain the size and distribution of the strength stress of the semi shaft. Then the crack propagation path is simplified according to the crack propagation path proposed by the Lewicki, according to the maximum stress point of the root stress proposed by J.Kramberger. In this position, the crack model is introduced and the finite element analysis.3 is used to analyze the S-N curve of the semi shaft by analyzing the material structure characteristics of the half axis, the stress concentration, the surface condition, the size effect and the loading condition. On this basis, the typical working conditions of a loader are analyzed and the fatigue strength is analyzed by the variable amplitude load. The load stress spectrum of the half axle load of a loader is obtained. The normal distribution of the variable amplitude load is calculated by using the probability statistics method and the "3 Sigma" rule. According to the Miner fatigue analysis theory, the fatigue life analysis is carried out on the semi shaft recovery parts with the S-N curve and the load spectrum of the half axis, and the stress change law under the different load conditions is combined with the back push. The maximum fatigue stress value is introduced by the method. At last, the limit parameter value of the tooth root crack is obtained by comparison and analysis. The judgment method for the limit crack of the semi shaft recovery parts is initially established, which provides reference for the use of the semi shaft remanufacturing parts and other remanufactured parts.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH243

【参考文献】