Failure analysis of a generator rotor with a deep crack detected during operation: fractographic and fracture mechanics approach

被引：11

作者：

Bicego, V

Lucon, E

Rinaldi, C

Crudeli, R

机构：

[1] ENEL SpA, Div Prod Ingn, Pisa, Italy

[2] ENEL SRI, Generat Area, Milan, Italy

来源：

NUCLEAR ENGINEERING AND DESIGN | 1999年 / 188卷 / 02期

关键词：

D O I：

10.1016/S0029-5493(99)00014-X

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

This paper reports the results of an activity of failure analysis performed on a 370 MVA generator rotor that was scrapped after about 133 000 operating hours and about 400 start-ups, when the on line monitoring system revealed a progressive increase in vibrations amplitude, due to the presence of a deep crack. It was actually detected by automated ultrasonic equipment using advanced signal processing. Failure analysis and laboratory tests demonstrated that the crack started from a forging defect located at the root of a longitudinal slot, due to the high stress range induced by oil film instability problems. During the following years the crack grew mainly during transients and not during operation. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：173 / 183

页数：11