Research on Nonlinear Ultrasonic Properties of Tension Stress in Metal Materials

Hongjuan YAN

doi:10.3901/jme.2016.06.022

Research on Nonlinear Ultrasonic Properties of Tension Stress in Metal Materials

Journal of Mechanical Engineering ◽

10.3901/jme.2016.06.022 ◽

2016 ◽

Vol 52 (6) ◽

pp. 22 ◽

Cited By ~ 5

Author(s):

Hongjuan YAN

Keyword(s):

Tension Stress ◽

Ultrasonic Properties ◽

Nonlinear Ultrasonic ◽

Metal Materials

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Nonlinear Ultrasonic Properties of As-Quenched Steels

Nondestructive Characterization of Materials VIII ◽

10.1007/978-1-4615-4847-8_130 ◽

1998 ◽

pp. 825-829 ◽

Cited By ~ 2

Author(s):

D. C. Hurley ◽

P. T. Purtscher ◽

K. W. Hollman ◽

C. M. Fortunko

Keyword(s):

Ultrasonic Properties ◽

Nonlinear Ultrasonic

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Simulation and Experimental Study of Closed Crack Detection by Ultrasonic Nonlinearity Under Electromagnetic Loading

Studies in Applied Electromagnetics and Mechanics - Electromagnetic Non-Destructive Evaluation (XXIII) ◽

10.3233/saem200017 ◽

2020 ◽

Author(s):

Chuang Zhang ◽

Longlong He ◽

Suzhen Liu ◽

Qingxin Yang

Keyword(s):

Crack Detection ◽

Response Signal ◽

Closed Crack ◽

Ultrasonic Detection ◽

External Interference ◽

Weak Response ◽

Nonlinear Ultrasonic ◽

Testing Technology ◽

Frequency Components ◽

Metal Materials

The reliability of micro-damage detection of metal materials plays a crucial role in the safe and reliable operation of large equipment. In recent years, nonlinear ultrasonic nondestructive testing technology has achieved good development in closed cracks detection, but the problem of nonlinear ultrasonic detection of closed cracks is weak response signal and vulnerable to external interference. This paper realizes the modulation of the ultrasonic wave by electromagnetic loading at the closed cracks, which can effectively enrich the frequency components of nonlinear ultrasonic and magnify the amplitude. This lays a foundation for further research on nonlinear ultrasonic detection of closed cracks under electromagnetic loading.

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Monitoring of stress variation of strands in prestressed concrete by second harmonic generation measurements based on piezoelectric sensors

Smart Materials and Structures ◽

10.1088/1361-665x/ac36e1 ◽

2021 ◽

Author(s):

JUN CHEN ◽

Xiaohan Wan ◽

Quanquan Guo

Keyword(s):

Second Harmonic Generation ◽

Harmonic Generation ◽

Contact Force ◽

Prestressed Concrete ◽

Second Harmonic ◽

Nonlinear Parameter ◽

Tension Stress ◽

Stress Monitoring ◽

Stress Variation ◽

Nonlinear Ultrasonic

Abstract The stress loss of prestressed concrete may cause the ultimate failure of structures and the monitoring of stress variation of prestressed structures is therefore important to ensure the service safety. This paper developed a nondestructive evaluation (NDE) method of nonlinear ultrasonic second harmonic generation (SHG) based on piezoelectric (PZT) sensors and applied for the distinction of different stress level of post-tensioned steel strands in concrete. The nonlinear ultrasonic behavior of both free strand and embedded strand having different length is studied with the developed SHG technique and a defined nonlinear parameter is introduced in SHG experiments to correlate with the tension stress in the strand. It is found that the nonlinear parameter has a negative correlation with the increasing stress of strand in both free and embedded case, indicating the nonlinear ultrasonic behavior is getting weak corresponding to the increasing contact force among strand wires. In addition, the decreasing ratio of nonlinear parameter is very close to each other regardless of the length of steel strand, indicating the possibility of replacing the large-scale on-site testing with scaled down samples in laboratory. The experimental results of this research demonstrate that the SHG technique based on PZT sensors could be useful for the stress monitoring of prestressed reinforced concrete with consideration of the relatively high sensitivity of nonlinear parameter to the variation of contact force of strand wires.

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