Experiment on DZ125 notch fatigue behavior at high temperature

HU Xiao-an; WANG Jing-ke; YANG Xiao-guang; SHI Duo-qi; HUANG Jia

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Experiment on DZ125 notch fatigue behavior at high temperature

更新时间：2026-07-07

- Experiment on DZ125 notch fatigue behavior at high temperature
- Vol. 28, Issue 7, (2013)
- 作者机构：
  
  1. 北京航空航天大学能源与动力工程学院,北京,100191
  2. 空军装备研究院装备总体论证研究所,北京,100076
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013
- 稿件说明：
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HU Xiao-an, WANG Jing-ke, YANG Xiao-guang, et al. Experiment on DZ125 notch fatigue behavior at high temperature[J]. 2013, 28(7).
DOI：

HU Xiao-an, WANG Jing-ke, YANG Xiao-guang, et al. Experiment on DZ125 notch fatigue behavior at high temperature[J]. 2013, 28(7). DOI：

摘要

研究了定向凝固合金DZ125 U型平板缺口试样在850℃下的缺口疲劳行为

进行了理论应力集中因子分别为1.91

3.01和4.35下的疲劳试验

原位观察了疲劳裂纹的萌生位置和扩展方向

并进行了疲劳寿命分析和裂纹萌生与扩展分析.结果表明:理论应力集中因子关联缺口疲劳寿命.随着名义应力的增加

缺口疲劳寿命对理论应力集中因子更敏感

而在低应力范围内

正好相反.通过原位观测技术

试验中还发现缺口疲劳裂纹的萌生和扩展并没有在最大轴向应力的缺口根部

而是缺口附近最大主应力位置.

Abstract

Notched fatigue behavior of directional solidified superalloy DZ125 at 850℃ was investigated.Different U type notched specimens with three stress concentration factors including 1.91

3.01

and 4.35 were tested.Crack initiation and propagation were observed in situ.The fatigue life and crack initiation and propagation were analyzed.The results indicate that stress concentration factor is an important parameter infect the life to fatigne failures

while converse results obtained at low stress range.With the increase of norminal stress

the notch fatigue life became more sensitive to stress concentration factor.Through in situ observation

it's found that the locations of the crack initiation and propagation were not at the root of the notch

but at the location with maximum principal stress.

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