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In-situ fatigue monitoring procedure using nonlinear ultrasonic surface waves considering the nonlinear effects in the measurement system

Journal Article · · Nuclear Engineering and Technology
 [1];  [1];  [1];  [2]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Ajou Univ., Suwon (Korea, Republic of)
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Second harmonic generation using nonlinear ultrasonic waves have been shown to be an early indicator of possible fatigue damage in nuclear power plant components. This technique relies on measuring amplitudes, making it highly susceptible to variations in transducer coupling and instrumentation. This paper proposes an experimental procedure for in-situ surface wave nonlinear ultrasound measurements on specimen with permanently mounted transducers under high cycle fatigue loading without interrupting the experiment. It allows continuous monitoring and minimizes variation due to transducer coupling. Moreover, relations describing the effects of the measurement system nonlinearity including the effects of the material transfer function on the measured nonlinearity parameter are derived. An in-situ high cycle fatigue test was conducted using two 304 stainless steel specimens with two different excitation frequencies. A comprehensive analysis of the nonlinear sources, which result in variations in the measured nonlinearity parameters, was performed and the effects of the system nonlinearities are explained and identified. In both specimens, monotonic trend was observed in nonlinear parameter when the value of fundamental amplitude was not changing.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
Ministry of Trade, Industry and Energy (Korea, Republic of); USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1512691
Alternate ID(s):
OSTI ID: 22819791
Report Number(s):
PNNL-SA--118962
Journal Information:
Nuclear Engineering and Technology, Journal Name: Nuclear Engineering and Technology Journal Issue: 3 Vol. 51; ISSN 1738-5733
Publisher:
Korean Nuclear SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (14)

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Fatigue damage evaluation in A36 steel using nonlinear Rayleigh surface waves journal June 2012
Assessment of material damage in a nickel-base superalloy using nonlinear Rayleigh surface waves journal June 2006
Dependence of microelastic-plastic nonlinearity of martensitic stainless steel on fatigue damage accumulation journal September 2006
Anomalous nonlinearity parameters of solids at low acoustic drive amplitudes journal January 2009
Nonlinear ultrasonics for in situ damage detection during high frequency fatigue journal July 2009
Dislocation contribution to acoustic nonlinearity: The effect of orientation-dependent line energy journal January 2011
Fatigue damage evaluation of austenitic stainless steel using nonlinear ultrasonic waves in low cycle regime journal May 2014
Applications of nonlinear ultrasonics to the NDE of material degradation journal May 2000
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Cited By (1)

Optical in-situ analysis method for fatigue cracks and its application in fatigue initiation and growth study on steels with different microstructures journal December 2019

Figures / Tables (14)

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Related Subjects

42 ENGINEERING
high-cycle fatigue
in-situ monitoring
nonlinear ultrasound
surface wave