微观结构下多晶材料的疲劳损伤模型及裂纹的数值模拟方法

杨静; 胡志伟; 刘栋; 张育飞

doi:10.13433/j.cnki.1003-8728.20190326

微观结构下多晶材料的疲劳损伤模型及裂纹的数值模拟方法

doi: 10.13433/j.cnki.1003-8728.20190326

1.
西安理工大学机械与精密仪器工程学院, 西安 710048
2.
杭州品茗安控信息技术股份有限公司, 杭州 310030

基金项目:

陕西省技术创新引导专项基金项目 2019QYPY-073

西安市科技计划项目 2017080CG/RC043（XALG036）

详细信息

作者简介:
杨静(1971-), 副教授, 博士, 研究方向为机电系统检测与控制, yjzhd@163.com

中图分类号: TG156
计量
- 文章访问数: 297
- HTML全文浏览量: 166
- PDF下载量: 34
- 被引次数: 0
出版历程
- 收稿日期: 2019-08-04
- 刊出日期: 2020-11-01

Model for Fatigue Damage and Numerical Simulation Method of Cracks for Polycrystalline Material under Microstructure

1.
Faculty of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China
2.
Hangzhou Pinming Software Co., Ltd., Hangzhou 310030, China

摘要

摘要: 考虑多晶材料疲劳行为受晶粒拓扑结构的影响，建立了多晶材料Voronoi镶嵌的有限元微观结构模型，并在Voronoi边界插入内聚力单元模拟晶界特性。在此基础上，基于Abaqus双线性内聚力本构关系，建立了内聚力单元的疲劳累积损伤模型，定义了损伤变量，损伤判据以及损伤规律；通过Abaqus UMAT（User-defined material mechanical behavior）子程序编写了内聚力单元疲劳损伤的数值计算程序，实现了对微观结构下材料滚动接触疲劳裂纹萌生与扩展的行为模拟。以滚子与滚道的接触疲劳分析为例，将数值模拟结果与实测结果相比，表明了该数值仿真方法模拟多晶材料裂纹形成和扩展的有效性。
- 多晶材料 /
- 内聚力单元 /
- Voronoi镶嵌的有限元模型 /
- 疲劳损伤模型 /
- 疲劳裂纹模拟
Abstract: Considering the fatigue behavior of polycrystalline material affected by grain topology, the finite element model for microstructure with Voronoi tessellation algorithm is established, and the grain boundary characteristics is simulated by inserting the cohesive elements. Then, based on the constitutive relationship of Abaqus bilinear cohesive force, the model for fatigue cumulative damage of cohesive element is established, and the damage variable, damage criterion and damage law are defined. The fatigue damage of cohesive elements is calculated with Abaqus User-defined material mechanical behavior. The calculation program realizes the behavior simulation of the rolling contact fatigue crack initiation and propagation under the microstructure. Finally, the contact fatigue analysis of the roller and the raceway is taken as an example. The simulation results are compared with the measured, which shows the effectiveness of the simulation method in simulating the formation and propagation of cracks for polycrystalline materials.
- polycrystalline material /
- cohesive element /
- finite element model with Voronoi tessellation algorithm /
- fatigue damage model /
- fatigue crack propagation

HTML全文

图 1 双线性本构关系

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图 2 单元疲劳退化

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图 3 单元损伤演化

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图 4 滚子与滚道接触

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图 5 材料微观模型

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图 6 滚道载荷

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图 7 内聚力单元疲劳计算过程

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图 8 裂纹扩展与应力变化

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图 9 裂纹仿真与实验结果比较

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图 10 牵引系数对裂纹的影响

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