Fatigue Crack Growth Threshold Determination for Welded Joint Constituents of a Steam Turbine LP Rotor

被引：0
|
作者：
M-H. H. Shen
S. R. Akanda
X. Liu
P. Wang
机构：
[1] The Ohio State University,Mechanical and Aerospace Engineering
[2] Shanghai Electric Power Generation Equipment Co.,Shanghai Turbine Plant
[3] Ltd.,undefined
来源：
Experimental Techniques | 2016年 / 40卷
关键词：
Compact Tension (CT); Fatigue Crack Threshold; Single-Edge Notch Bend (SENB); Welded Joint Constituent;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In the present investigation, fatigue crack growth threshold of the base metal, heat affected zone (HAZ), and weld metal of a steam turbine rotor’s welded joint constituents were determined by performing fatigue crack growth rate (FCGR) tests. Two types of test specimens were considered: (1) single-edge notch bend (SENB) and (2) compact tension (CT). Although a CT specimen is more appropriate for an FCGR test according to ASTM E647, in the present investigation the SENB and CT specimens were found to yield an equivalent fatigue crack growth threshold of the welded joint constituent. But, the SENB specimen provided some advantages over the CT specimen in performing the FCGR tests on the welded joints. It was also found that the fatigue crack growth threshold is a function of loading ratio rather than a single material parameter.
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页码：1215 / 1220
页数：5
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