Fatigue crack identification method based on strain amplitude changing

2017 2nd International Seminar on Advances in Materials Science and Engineering

Guo, Tiancai^1 ; Gao, Jun^1 ; Wang, Yonghong^1 ; Xu, Youliang^1

AECC Hunan Power Plant Research Institute, Zhuzhou

412002, China^1

关键词: Engineering methods;    Fatigue crack initiation;    Fatigue cracks;    Gearbox housings;    Helicopter transmission systems;    Life analysis;    Quantitative criteria;    Strain amplitude;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012165/pdf
DOI  :  10.1088/1757-899X/231/1/012165

来源: IOP

【 摘 要 】

Aiming at the difficulties in identifying the location and time of crack initiation in the castings of helicopter transmission system during fatigue tests, by introducing the classification diagnostic criteria of similar failure mode to find out the similarity of fatigue crack initiation among castings, an engineering method and quantitative criterion for detecting fatigue cracks based on strain amplitude changing is proposed. This method is applied on the fatigue test of a gearbox housing, whose results indicates: during the fatigue test, the system alarms when SC strain meter reaches the quantitative criterion. The afterwards check shows that a fatigue crack less than 5mm is found at the corresponding location of SC strain meter. The test result proves that the method can provide accurate test data for strength life analysis.