Study of fatigue crack growth in RAFM steel using acoustic emission technique

Abstract Acoustic emission technique (AET) has been used for characterization of fatigue crack growth (FCG) of a reduced activation ferritic-martensitic (RAFM) steel, a candidate structural material for the first wall and blanket applications in fusion reactors. The rate of AE activity generated as counts per cycle and energy per cycle has shown discontinuities corresponding to change in cyclic plasticity, crack closure and intergranular cracking in the transition regime. Peak amplitudes (PAs) of AE hits (events) could be used to distinguish crack growth in different regions of the FCG. The intergranular cracking in the transition regime is characterized by higher number of hits with peak amplitude up to 88 dB along with the appearance of emissions with PA from 66 to 88 dB. The variation of event duration with peak amplitude have shown that the FCG process is characterized by signals of two groups at higher values of Δ K whereas the closure and transition regimes are characterized by single group of signals.

[1]  T. M. Roberts,et al.  Fatigue life prediction based on crack propagation and acoustic emission count rates , 2003 .

[2]  C. E. Richards,et al.  Acoustic emission monitoring of fatigue crack growth , 1978 .

[3]  Boris A. Zárate,et al.  Deterministic and probabilistic fatigue prognosis of cracked specimens using acoustic emissions , 2012 .

[4]  M. N. Bassim,et al.  Acoustic emission mechanisms during high-cycle fatigue , 1981 .

[5]  R. C. Mcmaster.  Nondestructive testing handbook , 1959 .

[6]  Baldev Raj,et al.  Influence of micro structure on acoustic emission behavior during stage 2 fatigue crack growth in solution annealed, thermally aged and weld specimens of AISI type 316 stainless steel , 1996 .

[7]  A. K. Bhaduri,et al.  Fatigue Crack Growth Characterisation of RAFM Steel using Acoustic Emission Technique , 2013 .

[8]  Hongyun Luo,et al.  Effects of micro-structure on fatigue crack propagation and acoustic emission behaviors in a micro-alloyed steel , 2013 .

[9]  Dong-Jin Yoon,et al.  Determining the stress intensity factor of a material with an artificial neural network from acoustic emission measurements , 2004 .

[10]  Jian-Sheng Wang.  The thermodynamics aspects of hydrogen induced embrittlement , 2001 .

[11]  M. N. Bassim,et al.  Detection of the onset of fatigue crack growth in rail steels using acoustic emission , 1994 .

[12]  Boris A. Zárate,et al.  Prediction of fatigue crack growth in steel bridge components using acoustic emission , 2011 .

[13]  D. Thompson,et al.  Review of Progress in Quantitative Nondestructive Evaluation , 1982 .

[14]  Paul Ziehl,et al.  Stable and unstable fatigue prediction for A572 structural steel using acoustic emission , 2012 .

[15]  Hongyun Luo,et al.  Acoustic emission source mechanism analysis and crack length prediction during fatigue crack propagation in 16Mn steel and welds , 2012 .

[16]  A. Laksimi,et al.  Monitoring crack growth in pressure vessel steels by the acoustic emission technique and the method of potential difference , 2006 .

[17]  S. Suresh.  Fatigue of materials , 1991 .

[18]  A. Teleman,et al.  Detection of fatigue crack growth by acoustic emission techniques , 1971 .

[19]  Daining Fang,et al.  Study of fatigue crack characteristics by acoustic emission , 1995 .

[20]  Baldev Raj,et al.  Fatigue crack growth mechanism in aged 9Cr–1Mo steel: threshold and Paris regimes , 2005 .

[21]  T. M. Roberts,et al.  Acoustic emission monitoring of fatigue crack propagation , 2003 .

[22]  Theodore E. Matikas,et al.  Acoustic emission for fatigue damage characterization in metal plates , 2011 .

[23]  S. Burns,et al.  Non-linear fracture mechanics , 1978, International Journal of Fracture.

[24]  Ke Wei,et al.  Acoustic emission study of fatigue crack closure of physical short and long cracks for aluminum alloy LY12CZ , 2009 .

[25]  Jaap Schijve,et al.  Fatigue of structures and materials , 2001 .

[26]  T. Jayakumar,et al.  Understanding fatigue crack propagation in AISI 316 (N) weld using Elber’s crack closure concept: Experimental results from GCMOD and acoustic emission techniques , 2007 .

[27]  Hongyun Luo,et al.  Acoustic emission during fatigue crack propagation in a micro-alloyed steel and welds , 2011 .

[28]  R. Ritchie.  Mechanisms of fatigue damage and crack growth in advanced materials , 2000 .

[29]  H. L. Dunegan,et al.  Continuous monitoring of fatigue-crack growth by acoustic-emission techniques , 1974 .

[30]  P. C. Paris,et al.  A Critical Analysis of Crack Propagation Laws , 1963 .

[31]  R. Harrington,et al.  Acoustic emissions of fatigue crack growth , 1973 .

[32]  M. N. James,et al.  Intergranular crack paths during fatigue in interstitial-free steels , 2010 .