Assessment of Reinforced Concrete Surface Breaking Crack Using Rayleigh Wave Measurement

Lee, Foo Wei; Chai, Hwa Kian; Lim, Kok-Sing

doi:10.3390/s16030337

Cited by 19 publications

(12 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fun(x 2 , ξ 0 )dx 2 (22) where d(x 1 ) is the flaw depth at coordinate x 1 . The integral range has been extended from minus infinity to infinity, since d(x 1 ) = 0 in the intact areas.…”

Section: Formulation Of Inverse Reconstructionmentioning

confidence: 99%

“…The inverse analysis is an important aspect and fundamental aim for studying the scattering of Rayleigh wave. Many researchers have tried to relate the amplitude and time-of-flight (TOF) of reflected wave with surface-breaking cracks [20][21][22][23] or notches [24,25], both in experimental and numerical aspects, in order to achieve flaw location and sizing effect. These researchers mainly adopted pitch-catch configurations, and were able to detect the positions and approximate sizes of defects, but lacked further information, such as depth, width, and severity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Forward and Inverse Studies on Scattering of Rayleigh Wave at Surface Flaws

Wang

Qian

2018

Applied Sciences

View full text Add to dashboard Cite

The Rayleigh wave has been frequently applied in geological seismic inspection and ultrasonic non-destructive testing, due to its low attenuation and dispersion. A thorough and effective utilization of Rayleigh wave requires better understanding of its scattering phenomenon. The paper analyzes the scattering of Rayleigh wave at the canyon-shaped flaws on the surface, both in forward and inverse aspects. Firstly, we suggest a modified boundary element method (BEM) incorporating the far-field displacement patterns into the traditional BEM equation set. Results show that the modified BEM is an efficient and accurate approach for calculating far-field reflection coefficients. Secondly, we propose an inverse reconstruction procedure for the flaw shape using reflection coefficients of Rayleigh wave. By theoretical deduction, it can be proved that the objective function of flaw depth d(x 1) is approximately expressed as an inverse Fourier transform of reflection coefficients in wavenumber domain. Numerical examples are given by substituting the reflection coefficients obtained from the forward analysis into the inversion algorithm, and good agreements are shown between the reconstructed flaw images and the geometric characteristics of the actual flaws.

show abstract

“…Fun(x 2 , ξ 0 )dx 2 (22) where d(x 1 ) is the flaw depth at coordinate x 1 . The integral range has been extended from minus infinity to infinity, since d(x 1 ) = 0 in the intact areas.…”

Section: Formulation Of Inverse Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Forward and Inverse Studies on Scattering of Rayleigh Wave at Surface Flaws

Wang

Qian

2018

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Compared with the bulk waves, they can propagate a long distance along the component surface with less beam spreading [3,4]. Rayleigh wave is generated and detected on the same side of the material, therefore, access to only one side of the material is required [5].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Rayleigh Wave Beams Using Angle Beam Wedge Transducers as the Transmitter and Receiver with Consideration of Beam Spreading

Zhang

Jeong

2017

Sensors

View full text Add to dashboard Cite

A theoretical model, along with experimental verification, is developed to describe the generation, propagation and reception of a Rayleigh wave using angle beam wedge transducers. The Rayleigh wave generation process using an angle beam wedge transducer is analyzed, and the actual Rayleigh wave sound source distributions are evaluated numerically. Based on the reciprocity theorem and considering the actual sound source, the Rayleigh wave beams are modeled using an area integral method. The leaky Rayleigh wave theory is introduced to investigate the reception of the Rayleigh wave using the angle beam wedge transducers, and the effects of the wave spreading in the wedge and transducer size are considered in the reception process. The effects of attenuations of the Rayleigh wave and leaky Rayleigh wave are discussed, and the received wave results with different sizes of receivers are compared. The experiments are conducted using two angle beam wedge transducers to measure the Rayleigh wave, and the measurement results are compared with the predictions using different theoretical models. It is shown that the proposed model which considers the wave spreading in both the sample and wedges can be used to interpret the measurements reasonably.

show abstract

“…Several studies related to the detection of surface flaws in civil infrastructures using different imaging techniques have been reported [9][10][11][12][13][14][15][16][17][18][19]. Microwave and millimeter wave imaging techniques have been used to detect fatigue cracks in metal [9,10] and concrete [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, this technique is mainly useful for conducting materials but not for dielectric materials such as concrete. Different parameters of Rayleigh wave sensed by accelerometers, which were attached to the surface of the reinforced concrete block under impact, were analyzed to detect an artificial crack on the surface of the reinforced concrete [14]. However, this method needed direct surface contact of sensor and also needed external impact, which are not always practical.…”

Section: Introductionmentioning

confidence: 99%

Inspection of Metal and Concrete Specimens Using Imaging System with Laser Displacement Sensor

2017

View full text Add to dashboard Cite

Flaws such as cracks and impact damages initially occur on the surface of the infrastructure materials and propagate internally causing further degradation. These infrastructure materials have different physical and chemical composition and have different geometric shapes, which can mask the indication of minute surface flaws. There is a need to develop systems that can detect these surface flaws irrespective of their properties and shapes. We propose an imaging system capable of interrogating plain and non-plain structures for the purpose of detection and evaluation of surface flaws such as cracks and impact damages using a laser displacement sensor (LDS). The developed system consists of LDS mounted on the scanner, which is capable of raster scanning over the material under test. The reading of displacement from the sensor head to the laser spot on the surface of the test material is then used to generate two-dimensional (2-D) images in real time, which can be used to detect minute surface flaws. This paper presents the results of inspection of metal and concrete test specimens. 2-D images through the cut of the metal profile are also generated to demonstrate the ability of a system to image interior structure.

show abstract

Assessment of Reinforced Concrete Surface Breaking Crack Using Rayleigh Wave Measurement

Cited by 19 publications

References 21 publications

Forward and Inverse Studies on Scattering of Rayleigh Wave at Surface Flaws

Forward and Inverse Studies on Scattering of Rayleigh Wave at Surface Flaws

Measurement of Rayleigh Wave Beams Using Angle Beam Wedge Transducers as the Transmitter and Receiver with Consideration of Beam Spreading

Inspection of Metal and Concrete Specimens Using Imaging System with Laser Displacement Sensor

Contact Info

Product

Resources

About