Prediction Model of Fatigue Crack Growth Behavior by Introducing Strain Cycle Damage

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Prediction Model of Fatigue Crack Growth Behavior by Introducing Strain Cycle Damage

更新时间：2025-07-09

- Prediction Model of Fatigue Crack Growth Behavior by Introducing Strain Cycle Damage
- Vol. 46, Issue 9, Pages: 114-118(2012)
- 作者机构：
  
  西南交通大学力学与工程学院,成都,610031
- 作者简介：
- 基金信息：
- DOI：
  CLC： O346.1;TG113.25
- Online First：10 September 2012，
  
  Published：2012
- 稿件说明：
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Prediction Model of Fatigue Crack Growth Behavior by Introducing Strain Cycle Damage[J]. 2012, 46(9): 114-118.
DOI：

Prediction Model of Fatigue Crack Growth Behavior by Introducing Strain Cycle Damage[J]. 2012, 46(9): 114-118. DOI：

摘要

根据循环载荷下的裂尖循环弹塑性应力应变场分析

结合Manson-Coffin经验关系

定义了基于循环塑性区内材料塑性应变幅值的单位平均损伤; 根据Miner疲劳线性累积损伤理论

以裂尖扩展方向的循环塑性区尺寸为裂纹裂尖的单位扩展量

提出了基于低周疲劳损伤预测I型裂纹扩展速率的新预测模型.新模型中给出的参数均有明确的物理意义

不需要人为调试.Cr2Ni2MoV和X12CrMoWVNbN 10-1-1两种转子材料的低周疲劳试验结果表明

新模型对这两种材料裂纹扩展速率的预测结果与试验结果吻合良好.利用相关文献中提供的6种材料的低周疲劳性能数据

进一步验证了新模型用于裂纹扩展速率预测的良好适用性.

Abstract

According to the cyclic elasto-plastic HRR field near the crack tip

the Manson-Coffin theory is applied to define the unit average damage over the plastic strain magnitude of the materials within the cyclic plastic region. Assuming the step size of the crack advancement equals the size of the real cyclic plastic region along the crack growth direction

then following the linear damage accumulation theory-Miner law

a model for predicting the low cycle fatigue crack growth of the opening mode crack is set up. It is noted that every factor in the new model is endowed with clear physical meaning without any human debugging. The prediction results of the low cyclic fatigue crack propagation by the proposed model coincide well with the low cycle fatigue test data of two rotor materials. The good prediction capability of the proposed model is verified by the data of six different materials from literatures.

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references

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HUANG Xuewei, CAI Lixun, BAO Cheng, et al. A new method of numerical simulation for behavior of fatigue crack propagation based on low cycle fatigue damage [J]. Journal of Engineering Mechanics, 2011, 28(10): 202-208.

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《工程材料实用手册》编辑委员会.工程材料实用手册:钛合金、铜合金[M].2版.北京:中国标准出版社, 2001: 115-124.

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