ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Remaining Fatigue Life Prediction of High-strength Steel Based on Thermal Response of Fatigue
Received date: 2013-07-05
Revised date: 2013-08-15
Online published: 2013-08-27
Supported by
National Natural Science Foundation of China (50775182)
To estimate the useful life of servicing structural material by nondestructive approach, especially to estimate the remaining fatigue life of specimen that have undergone unknown number of cycles of loading, a remaining fatigue life prediction method is proposed in this paper. Using 300M steel specimen to perform fatigue tests with different cyclic load amplitudes, the temperatures of all specimen are monitored by infrared thermography during the whole tests. The data of slopes of initial temperature rise caused by excitation load is recorded to construct the "reference slope surface series" which reflected the relation of the thermal response of specimen and fatigue life, this is the foundation for estimating remaining useful life of high-strength steel. The results show that slope of initial temperature rise caused by excitation load is linearly related to fatigue damage, that is, accumulated numbers of cycles of specimen. The experimental verification suggests that the error of this remaining fatigue life estimation is less than 5%; hence, this relation can be employed as an indicator for estimating remaining fatigue life.
FENG Shuo, WANG Zhongqi, CHEN Weiwei, QIAO Songsong, XUE Hongqian. Remaining Fatigue Life Prediction of High-strength Steel Based on Thermal Response of Fatigue[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(4): 1034-1041. DOI: 10.7527/S1000-6893.2013.0366
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