Investigation on Acoustic Emission Characteristics from Q345R during Fatigue Crack Propagation

Abstract:

The fatigue crack propagation process of specimen made from Q345R was monitored by acoustic emission (AE) equipment. The AE characteristic of the specimen generated during the fatigue crack propagation was obtained by parameter analysis method and wavelet transform method .The results show that the fatigue crack growth curve comprises four phases of the crack generation phase, the low-speed crack propagation phase, the high-speed crack propagation phase and the fracture phase, and the variation of signal parameters presents the similar tendency to the fatigue crack growth rate. The values of signal parameters, such as count, energy, and amplitude, are stable and low in the crack generation phase and low-speed crack propagation phase, and relatively unstable and high in the high-speed crack propagation phase and fracture phase. The type of signals is burst emission and the frequency ranges from 100kHz to 180kHz. From these correlations, it may be possible to predict the remaining service life of a pressure vessel from the results of short-term AE monitoring of crack propagation.

• Periodical: Applied Mechanics and Materials (Volume 331)
• Pages: 61-64
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.331.61
• Online since: July 2013
• Authors: Meng Yu Chai, Li Chan Li, Yong Quan Li, Wen Jie Bai, Quan Duan
• Keywords: Acoustic Emission (AE), Fatigue Crack Propagation, Parameter Analysis, Q345R

References

[1] Ho SL and Jong HY: Processing Technology. 165, 2(2005), p.882

[2] Colin JC, Cherfaoui M, Cazrpreau JM and Chre´ tien JF: Memoires et etudes scientifiques de la Revue de metallurgiet.89,10(1992) , p.658

[3] Ohtsuka N, Nakano M and Ueyama H: Journal of Pressure Vessel Techonoly.103, 2(1981), p.19

[4] Shen Gongtian:NDT. 26, 9(2004), p.457

[5] Ennaceur C, Laksimi A and Herve C: International Journal of Pressure Vessels and piping. 83, 3 (2006), p.197

[6] Roberts TM and Talebzadeh M: Journal of construction Steel Research. 59, 6(2003) , p.695

[7] Shen Gongtian,Geng Rongsheng and Liu Shifeng:NDT. 24, 2(2004), p.72

[8] Li Guanghai and Liu Zhengyi: China Mechanical Engineering. 15, 13(2004) , p.72