Fatigue crack detection and identification by the elastic wave propagation method

In this paper the elastic wave propagation phenomenon was used to detect the initiation of the fatigue damage in isotropic plate with a circular hole. The safety and reliability of structures mostly depend on the effectiveness of the monitoring methods. The Structural Health Monitoring (SHM) system...

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Bibliographic Details
Published in:Mechanical systems and signal processing 2017-05, Vol.89, p.119-130
Main Authors: Stawiarski, Adam, Barski, Marek, Pająk, Piotr
Format: Article
Language:English
Subjects:
Aluminum
Crack initiation
Crack propagation
Damage assessment
Damage detection
Fatigue
Fatigue crack
Fatigue failure
Fracture mechanics
Lead zirconate titanates
Metal plates
Piezoelectricity
Propagation
Reliability engineering
SHM system
Structural damage
Structural reliability
Tensile tests
Tension test
Tension tests
Wave propagation
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Summary:In this paper the elastic wave propagation phenomenon was used to detect the initiation of the fatigue damage in isotropic plate with a circular hole. The safety and reliability of structures mostly depend on the effectiveness of the monitoring methods. The Structural Health Monitoring (SHM) system based on the active pitch-catch measurement technique was proposed. The piezoelectric (PZT) elements was used as an actuators and sensors in the multipoint measuring system. The comparison of the intact and defected structures has been used by damage detection algorithm. One part of the SHM system has been responsible for detection of the fatigue crack initiation. The second part observed the evolution of the damage growth and assess the size of the defect. The numerical results of the wave propagation phenomenon has been used to present the effectiveness and accuracy of the proposed method. The preliminary experimental analysis has been carried out during the tension test of the aluminum plate with a circular hole to determine the efficiency of the measurement technique. •The active pitch-catch measurement method was proposed with the use of PZT elements.•Comparison of the intact and defected plates was used by damage detection algorithm.•One part of the system was responsible for detection of the crack initiation.•.Second part observed the evolution of the damage and assess the size of the defect.•Experimental verification of the SHM system was carried out during the tension test.
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2016.08.023