Simulation on Structural Integrity Assessment of Cracks in Dangerous Areas of Gas Turbine Blade

CHAI Xiaoshuai; YIN Lizhong; DIAO Shengxuan; XU Jianping; YANG Jie

doi:10.19805/j.cnki.jcspe.2026.250102

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Simulation on Structural Integrity Assessment of Cracks in Dangerous Areas of Gas Turbine Blade

更新时间：2026-07-16

- Simulation on Structural Integrity Assessment of Cracks in Dangerous Areas of Gas Turbine Blade
- Chinese Journal of Power Engineering Vol. 46, Issue 7, Pages: 11-18(2026)
- 作者机构：
  
  1. 上海理工大学能源与动力工程学院,上海,200093
  2. 菏泽朝泰环境科技有限公司,山东,菏泽,274000
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250102
  CLC： TK474.8+11
- Published：2026
- 稿件说明：
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柴小帅, 尹利众, 刁圣轩, 徐建平, 杨杰. 燃气轮机叶片危险区域裂纹结构完整性评定模拟[J]. 动力工程学报, 2026, 46(7): 11-18.
柴小帅, 尹利众, 刁圣轩, 徐建平, 杨杰. 燃气轮机叶片危险区域裂纹结构完整性评定模拟[J]. 动力工程学报, 2026, 46(7): 11-18. DOI： 10.19805/j.cnki.jcspe.2026.250102.

DOI： 10.19805/j.cnki.jcspe.2026.250102

摘要

选择某燃气轮机叶片为研究对象

基于有限元模拟

首先对无裂纹叶片进行应力分析确定危险区域

然后在危险区域设置初始裂纹

基于R6规范对裂纹进行结构完整性评定

绘制失效评定图(failure assessment diagram

FAD)

计算最大可接受裂纹尺寸。其次考察裂纹位置对评定的影响

并针对实际工况下可能出现的双裂纹

分析了第二条裂纹的存在对第一条裂纹失效的影响。最后考察了裂纹形状对FAD的影响。结果表明:1/4圆形角裂纹的最大可接受尺寸在两侧倒角处最小

在中心位置最大;第二条裂纹的存在会增加第一条裂纹的危险性;改变裂纹形状

对于单个1/4椭圆形角裂纹

随着短半轴长/长半轴长(即a/c)的增加

失效评定曲线会逐渐从安全区向危险区偏移

最大可接受裂纹尺寸减小。

Abstract

A gas turbine blade was selected as the research object

based on finite element simulation. Firstly

the stress analysis was conducted on the non-cracked blade to determine the dangerous area

then the initial crack was set up in the dangerous area

and the structural integrity assessment was conducted based on the R6 specification for the cracks to draw the failure assessment diagram (FAD) and calculate the maximum acceptable crack size. Further

the influence of crack location assessment was investigated

and the influence of the existence of the second crack on the failure of the first crack was analyzed for the double cracks that may occur under actual working conditions. Finally

the effect of crack shape on FAD was examined. Results show that the maximum acceptable size of the 1/4 rounded corner crack is the smallest at both chamfers and the largest at the center. The presence of the second crack increases the danger of the first crack. When changing the crack shape

for a single 1/4 ellipticalcorner crack

the failure assessment curve gradually shifts from the safe region to the hazardous region with the increase of a/c (a is the length of the elliptical short half axis

c is the length of the long half axis)

and the maximum acceptable crack size decreases.

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Keywords

references

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