Application of the acoustic emission method in fatigue cracking and fracture toughness estimation for steel

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Authors

  • S. PILECKI Institute of Fundamental Technological Research, Polish Academy of Sciences, Poland
  • J. SIEDLACZEK High Pressure Research Center, Polish Academy of Sciences, Poland

Abstract

The present paper consists of the confirmation of previous works where the great variety of the acoustic emission (AE) characteristics of different metals have been found. Based on the experiments conducted for the St90PA steel, possibilities of the fatigue cracks initiation detection by use of the AE method are discussed herein. Relations between the fatigue crack length and AE count rate or count sum have been determined and the possibilities of the application of AE in fracture toughness estimation as well as in critical stress intensity factor K1c calculations have been presented. It has been stated that creation of the fatigue cracks in steel can be detected much earlier by use of the AE method than it was possible by use of the classical optical method. AE method also makes the estimation of the propagating crack length easier as well as it can make the estimation of the fracture toughness more accurate.

References

[1] S. PILECKI, J. SIEDLACZEK, Acoustic activity of some metals determined by the acoustic emission method, Arch. of Acoust. 14, 3-4, 261-281 (1989).

[2] S. PILECKI, Wykorzystanie emisji akustycznej w badaniach własności mechanicznych i pękania ciał stałych, Arch. Akust. 21, 109 (1986).

[3] S. PILECKI, J. SIEDLACZEK, I. JAROSZYŃSKA, Opracowanie metody wykorzystania emisji akustycznej do oceny inicjacji kruchych peknięć szyn kolejowych i ram wózków, PAN IPPT. Warszawa 1984.

[4] H. M. JONES, W. F. BROWN, Acoustic detection of crack initiation in sharply notched specimens, Mater. Res. Stand. 4, 3, 120-129 (1964).

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