A fast approach for fatigue life estimation of structure with pit defect

Linyuan KUANG; Liangang ZHENG; Dongchuan SU; Donghui WANG; Yingxue SUN

doi:10.11889/j.0253-3219.2016.hjs.39.040606

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A fast approach for fatigue life estimation of structure with pit defect

更新时间：2021-05-25

- A fast approach for fatigue life estimation of structure with pit defect
- NUCLEAR TECHNIQUES Vol. 39, Issue 4, Article number: 040606(2016)
- 作者机构：
  
  中国核动力研究设计院核反应堆系统设计技术重点实验室成都 610213
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2016.hjs.39.040606
  CLC： TL99;TB12
- Received：26 November 2015，
  
  Revised：18 February 2016，
  
  Accepted：2016-02-18，
  
  Published：25 April 2016
- 稿件说明：
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Linyuan KUANG, Liangang ZHENG, Dongchuan SU, et al. A fast approach for fatigue life estimation of structure with pit defect[J]. Nuclear techniques, 2016, 39(4): 040606
DOI：

Linyuan KUANG, Liangang ZHENG, Dongchuan SU, et al. A fast approach for fatigue life estimation of structure with pit defect[J]. Nuclear techniques, 2016, 39(4): 040606 DOI： 10.11889/j.0253-3219.2016.hjs.39.040606.

摘要

基于Miner线性累积损伤理论

探讨了含凹坑缺陷结构使用系数与相应的无缺陷结构使用系数之间的计算关系。在

曲线数据拟合的基础上

推导了许用循环次数的比值计算式

并以核压力容器常用材料为例

给出了计算式待定常数的取值及适用范围。形成的疲劳寿命估算方法

为含凹坑缺陷结构的快速疲劳分析及评定提供了一种参考方法。

Abstract

Background:

The appearance of smooth pit defect brings considerable difficulties to the prediction of fatigue life of structure whilst the traditional approach of fatigue analysis hardly meets the requirements of engineering applications.

Purpose:

This study aims to find a fast approach for fatigue life estimation of structure with pit defeat for engineering applications.

Methods:

Based on Miner linear cumulative damage rule

the quantitative relation between usage factor of structure with pit defect and that of structure without pit defect is determined. Based on the data fitting of the

curve

the expressions of ratio of the permissible number of cycles are deduced

and the range of application is given for common materials of nuclear pressure vessel.

Results:

Computional results using above mentioned approach provide the codomain of undetermined constants and sphere of application.

Conclusion:

The approach for fatigue life estimation of structure with pit defect meets the requirements of engineering applications

thus is suitable to fast estimation of fatigue life for nuclear pressure vessel.

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references

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中华人民共和国国家质量监督检验检疫总局 . 在用含缺陷压力容器安全评定:GB/T 19624-2004 . 北京:中国标准出版社 , 2004 .

General Administration of Quality Supervision , Inspection and Quarantine of the People's Republic of China . Safety assessment for in-service pressure vessels containing defects:GB/T 19624-2004 . Beijing:Standards Press of China , 2004 .

陈传尧 . 疲劳与断裂 . 武汉:华中科技大学出版社 , 2002 .

CHEN Chuanyao . Fatigue and fracture . Wuhan:Huazhong University of Science and Technology Press , 2002 .

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