材料构型力驱动的复合型疲劳裂纹扩展行为研究

武志宏 1; 王芳文 1; 刘冉 1; 2; 李群 1; 2

doi:10.7652/xjtuxb201809006

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材料构型力驱动的复合型疲劳裂纹扩展行为研究

更新时间：2025-05-01

- 材料构型力驱动的复合型疲劳裂纹扩展行为研究
- Investigation on Mixed-Mode Fatigue Crack Growth Driven by Configurational Force
- 西安交通大学学报 2018年52卷第9期页码：45-53
- 作者机构：
  
  1. 西安交通大学机械结构强度与振动国家重点实验室,西安,710049
  2. 西安交通大学航天航空学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2017-12-25。作者简介: 武志宏(1991—),男,硕士生;李群(通信作者),男,教授,博士生导师。基金项目: 国家自然科学基金资助项目(11472205,11772245)
- DOI：10.7652/xjtuxb201809006
  中图分类号： TH111
- 网络首发：2018-09-10，
  
  纸质出版：2018
- 稿件说明：
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武志宏 1, 王芳文 1, 刘冉 1, 等. 材料构型力驱动的复合型疲劳裂纹扩展行为研究[J]. 西安交通大学学报, 2018,52(9):45-53.

Investigation on Mixed-Mode Fatigue Crack Growth Driven by Configurational Force[J]. 2018, 52(9): 45-53.
武志宏 1, 王芳文 1, 刘冉 1, 等. 材料构型力驱动的复合型疲劳裂纹扩展行为研究[J]. 西安交通大学学报, 2018,52(9):45-53. DOI： 10.7652/xjtuxb201809006.

Investigation on Mixed-Mode Fatigue Crack Growth Driven by Configurational Force[J]. 2018, 52(9): 45-53. DOI： 10.7652/xjtuxb201809006.

摘要

基于材料构型力断裂准则

提出了一种描述复合型疲劳裂纹扩展规律的新模型

该模型不仅能够预测复合型裂纹的扩展路径

而且可以计算裂纹扩展寿命。以该模型为基础

对疲劳问题中的复合型裂纹扩展失效问题进行了研究。首先

根据材料构型力理论

建立了复合型疲劳裂纹扩展模型

开发了构型力的有限元计算程序

实现了疲劳裂纹扩展的数值计算; 其次

采用构型力驱动准则

对Ⅰ型和I-II复合型疲劳裂纹进行了数值分析

计算了裂纹扩展路径以及扩展寿命

数值分析结果与试验结果基本一致

从而验证了该方法的有效性。最后

针对工程实际中可能出现的复杂疲劳裂纹扩展问题

具体研究了边界裂纹与圆孔缺陷干涉作用下的金属板疲劳问题

结果表明:斜裂纹角度以及孔洞与裂纹的相对位置均会影响扩展路径以及疲劳寿命; 对于不含圆孔的斜裂纹问题

裂纹角度越大

寿命就越长

而对于含圆孔的边界裂纹问题

由于孔洞的存在导致了裂纹朝孔洞方向偏转和裂纹扩展速率减小

并可能发生止裂现象。

Abstract

An innovative fatigue model is proposed by following the fracture criterion associated with the material configurational force

which is applicable for estimating the more general mixed-mode crack problems under cyclic loading

corresponding the mixed-mode crack deflection angle. Moreover

the proposed model can predict the fatigue residual lifetime. The mixed-mode fatigue crack propagation model is constructed following the theory of material configuration mechanics

and a finite element program of the theoretical fatigue model for fatigue crack propagation simulation is developed. The configurational force criterion is adopted to numerically analyze both the pure mode I and I-II mixed-mode crack propagation

and the lifetime and propagation paths are predicted. The numerical results coincide well with the experimental ones. To research the general mixed-mode fatigue crack propagation in actual engineering structures

the fatigue behavior of metal plate with an edge crack or a circular hole is considered as an example. It is found that the inclined crack angle and the relative position of circular holes with respect to the major crack have significant influences on the crack deflection and residual fatigue lifetime. For the plane metal plate with inclined edge crack

larger inclination angle leads to a longer residual lifetime. Besides

due to the interaction between the hole and crack

the crack propagates towards the hole. Particularly

there exist a certain distance between the hole and crack

at which the propagation rate reduces and the crack may be inhibited.

关键词

Keywords

references

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