动车组空心车轴应力强度因子研究

余海峰; 吴兴文; 梁树林; 池茂儒

doi:10.13433/j.cnki.1003-8728.20220144

动车组空心车轴应力强度因子研究

doi: 10.13433/j.cnki.1003-8728.20220144

1.
西南交通大学牵引动力国家重点实验室, 成都 610031
2.
西南交通大学机械工程学院, 成都 610031

基金项目:

国家重点研发计划 2018YFE0201401-01

国家自然科学基金项目 51805450

中国科协青年人才托举工程项目 2019QNRC001

四川省基础研究计划 2020YJ0075

详细信息

作者简介:
余海峰, 硕士研究生, haifeng_yu_email@163.com

通讯作者:
吴兴文, 副教授, 硕士生导师, xingwen_wu@163.com

中图分类号: U270.33
计量
- 文章访问数: 75
- HTML全文浏览量: 28
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2021-10-20
- 刊出日期: 2024-01-25

Study on Stress Intensity Factors of EMU Hollow Axles

1.
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
2.
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 为研究动车组空心车轴应力强度因子，首先分析了车轴应力强度因子的影响因素，建立了含裂纹车轴有限元模型，并使用叠加法求解不同载荷下的应力强度因子。然后采用应力外推法和位移外推法计算了应力强度因子，并将计算结果与文献形状因子公式法进行对比。最后根据应力强度因子的一般解析式和位移外推法的计算结果，使用五次多项式对形状因子函数进行拟合，通过设置不同的裂纹深度和载荷验证了形状因子函数和解析式的适用性。结果表明该方法对于求解同一载荷模式下的车轴应力强度因子具有一定的参考价值。
- 应力强度因子 /
- 有限元 /
- 叠加法 /
- 应力外推法 /
- 位移外推法 /
- 形状因子
Abstract: In order to study the stress intensity factors (SIFs) for hollow axle of EMU, the influencing factors of the axle SIFs were firstly analyzed. The finite element model for axle with crack was established, and the superposition method was used to evaluate SIFs under different loads. Then, the SIFs were calculated by using the stress extrapolation method (SEM) and displacement extrapolation method (DEM), and the calculation results were compared with that by using the shape factor formula method. Finally, a fifth-order polynomial was used to fit the shape factor function according to the general analytical formula of SIFs and calculation results via DEM. The applicability of the shape factor function and the analytical formula was verified by setting the different crack depths and loads. The results indicated the present method had certain reference value for calculating SIFs of axle under the same load mode.
- stress intensity factors /
- finite element /
- superposition method /
- stress extrapolation method /
- displacement extrapolation method /
- shape factor

HTML全文

图 1 二维平面内裂纹尖端坐标系的定义

Figure 1. Definition of coordinate systems at crack tip in a two-dimensional plane

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图 2 无裂纹车轴有限元模型

Figure 2. Finite element model of a crack-free axle

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图 3 有限元计算结果

Figure 3. Calculation results of finite element model

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图 4 裂纹形状演变曲线

Figure 4. Evolution curve of crack shape

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图 5 两种情况下沿厚度方向上的轴向主应力比较

Figure 5. Comparison of axial principal stress along the thickness direction in two cases

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图 6 裂纹模块示意图

Figure 6. Schematic diagram of crack module

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图 7 位移外推法拟合曲线

Figure 7. Fitted curve by using displacement extrapolation method

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图 8 应力外推法拟合曲线

Figure 8. Fitted curve by using stress extrapolation method

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图 9 应力强度因子计算结果对比

Figure 9. Comparison of stress intensity factor calculation results

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图 10 形状因子函数拟合曲线

Figure 10. Fitted curve of shape factor function

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图 11 应力强度因子拟合曲线

Figure 11. Fitted curve of stress intensity factors

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图 12 不同载荷下的应力强度因子对比

Figure 12. Comparison of stress intensity factors under different loads

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表 1 应力强度因子计算结果

Table 1. Calculation results of stress intensity factors

计算方法	位移外推法	应力外推法
K_{A, Bending}/(MPa·m^0.5)	3.457 84	2.401 66
K_{A, PF}/(MPa·m^0.5)	5.834 95	6.062 21
K_{A, Tol}/(MPa·m^0.5)	9.292 79	8.463 87

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表 2 形状因子函数拟合常数

Table 2. Constants for fitting the shape factor function

i	p_i	q_i
0	9.228×10^-1	6.580×10^-1
1	2.024×10^-2	-3.673×10^-3
2	-2.545×10^-3	-2.373×10^-3
3	1.045×10^-4	1.151×10^-4
4	-1.864×10^-6	-2.155×10^-6
5	1.235×10^-8	1.446×10^-8

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