考虑轮压载荷的铸造起重机多轴疲劳特性分析

冯梓彬; 魏国前; 郭子贤; 余震

doi:10.13433/j.cnki.1003-8728.20230044

考虑轮压载荷的铸造起重机多轴疲劳特性分析

doi: 10.13433/j.cnki.1003-8728.20230044

冯梓彬^1,,
魏国前^{1, 2, ,},
郭子贤²,
余震^{2, 3}

1.
武汉科技大学冶金装备及其控制教育部重点实验室，武汉 430081
2.
武汉科技大学机械传动与制造工程湖北省重点实验室，武汉 430081
3.
武汉科技大学精密制造研究院，武汉 430081

基金项目:

国家自然科学基金项目 51575408

国家自然科学基金项目 52175481

详细信息

作者简介:
冯梓彬，硕士研究生，1803730453@qq.com

通讯作者:
魏国前，教授，博士生导师，博士，weiguoqian@wust.edu.cn

中图分类号: TG231.1
计量
- 文章访问数: 6
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- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-16
- 刊出日期: 2024-07-25

Multiaxial Fatigue Analysis of Casting Crane Considering Wheel Pressure Loads

FENG Zibin^1
,,
WEI Guoqian^{1, 2
, ,},
GUO Zixian²,
YU Zhen^{2, 3}

1.
Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
2.
Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
3.
Precision Manufacturing Institute, Wuhan University of Science and Technology, Wuhan 430081, China

摘要

摘要: 铸造起重机金属结构是一种典型的复杂焊接结构，在移动轮压载荷和复杂焊缝几何的共同作用下，一些非常规部位时常出现疲劳裂纹。针对某在役铸造起重机主梁轨道下方T型钢与小筋板连接焊缝区域发生的密集疲劳裂损问题，采用Soild-Shell混合单元和子模型技术，建立了裂损局部区域的精细有限元模型，模拟了移动轮压载荷作用下整体金属结构的完整应力时间历程，分析了裂损部位的多轴特性。采用基于临界平面法的多轴疲劳模型，计算并讨论了裂损区域的疲劳性能。结果表明：多轴应力是导致裂损部位萌生裂纹的主要原因，F-S多轴疲劳模型可以有效评估裂损部位的疲劳性能。
- 铸造起重机 /
- 轮压载荷 /
- 多轴疲劳 /
- 寿命预测
Abstract: The metal structure of casting crane is a typical complex welding structure. Under the combined action of moving wheel pressure load and complex weld geometry, fatigue cracks often appear in several unconventional locations. In view of the intensive fatigue damage problem in the connection area of T-shaped steel and small rib plate under the main beam track of an in-service casting crane, the Soild-Shell mixed element and sub-model technology were used to establish the fine finite element model for crack area. The complete stress change process of the whole metal structure under the action of moving wheel pressure load was simulated, and the obvious multiaxial characteristics of the crack area were analyzed. The multiaxial fatigue model based on the critical plane method were used to calculate and discuss the fatigue performance of the crack area. The results show that the multiaxial stress is the main reason for the initiation of cracks at the crack area, and the F-S multiaxial fatigue model can effectively evaluate the fatigue performance of the crack area.
- casting crane /
- wheel pressure load /
- multiaxial fatigue /
- life prediction

HTML全文

图 1 铸造起重机主梁截面结构

Figure 1. Casting crane girder section structure

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图 2 外主梁裂纹分布图

Figure 2. Crack distribution diagram of outer main girder

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图 3 小筋板底部应力分布示意图

Figure 3. Stress distribution diagram of the small rib plate bottom

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图 4 多层有限元模型示意图

Figure 4. Schematic diagram of multistage finite element model

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图 5 两种模型应力分布对比

Figure 5. Comparison of stress distribution of two models

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图 6 多轴载荷路径

Figure 6. Multiaxial load path

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图 7 多轴指标参量计算分布图

Figure 7. Multiaxial parameter calculation distribution diagram

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图 8 典型位置的临界平面示意图

Figure 8. The critical plane schematic diagram of typical position

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图 9 待分析损伤平面示意图

Figure 9. Schematic diagram of damage plane to be analyzed

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图 10 FP分布的计算结果

Figure 10. The calculation results of FP distribution

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图 11 疲劳寿命分布曲线

Figure 11. Fatigue life distribution curves

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表 1 Q345弹塑性本构模型参数

Table 1. Parameters of Q345 elastoplastic constitutive model

E/MPa	ν	K/MPa	n
2.05×10⁵	0.3	679.933	0.109

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表 2 相关系数取值^[14]

Table 2. Value of correlation coefficient^[14]

剪切疲劳强度系数τ_f^′	剪切疲劳延性系数γ_f^′	剪切疲劳强度指数b₀	剪切疲劳延性系数c₀
617	1.568	-0.101	-0.651

下载: 导出CSV

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