A5045810041- Ultrasonics and Acoustic Wave Propagation
- Non-Destructive Testing Techniques
- Thermography and Photoacoustic Techniques
- Structural Health Monitoring Techniques
- Geophysical Methods and Applications
- Acoustic Wave Resonator Technologies
- Tunneling and Rock Mechanics
- Advanced Surface Polishing Techniques
- Advanced machining processes and optimization
- Welding Techniques and Residual Stresses
- Grouting, Rheology, and Soil Mechanics
- Geotechnical Engineering and Analysis
- Laser and Thermal Forming Techniques
- Advanced Optical Sensing Technologies
- Optical Systems and Laser Technology
- Laser Material Processing Techniques
- Advanced MEMS and NEMS Technologies
- Geotechnical Engineering and Soil Stabilization
- Geomechanics and Mining Engineering
- Optical measurement and interference techniques
- Flow Measurement and Analysis
- Seismic Waves and Analysis
- Landslides and related hazards
- Civil and Geotechnical Engineering Research
University of South Carolina
2017-2022
Hunan University of Science and Technology
2022
University of Pittsburgh
2017
Nanjing Institute of Technology
2009
Nanjing University of Aeronautics and Astronautics
2008
We present a structural health monitoring system based on the simultaneous use of passive and active sensing. The approach is acoustic emission, whereas uses electromechanical impedance guided ultrasonic wave methods. As all these methods can be deployed with wafer-type piezoelectric transducers bonded or embedded to structure interest, this article describes unified where impedance, are integrated in same hardware/software unit. assess feasibility multimodal large flat aluminum plate...
Lamb waves have been widely used for damage detection on plate-like structures. However, there are still considerable interests quantifying with complex profile. In this article, quantification of in structures using a network actuators and time-space wavefield is investigated. The actuator inspection system implemented multiple PZT transducers wave actuation round robin pattern scanning laser Doppler vibrometer sensing. arranged way that the target area fully enclosed come to from all...
Pitting corrosion presents challenges for ultrasonic nondestructive evaluation due to the small pit dimension. Few Lamb wave-based techniques have achieved identification of individual pits as subwavelength wave scatterers that are densely packed in a cluster. In this article, noncontact laser vibrometry-based fence-like arrays with wavefield filtering-assisted adaptive imaging algorithms developed detecting and identifying Signals back scattering waves induced by cluster acquired Doppler...
Abstract Stress corrosion cracking (SCC) had occurred in early-generation high-level nuclear waste tanks constructed by welding carbon steel. This paper describes an ultrasonic inspection system and its fundamental ability to detect quantify the length of SCC on thick welded steel plates. The finite element method (FEM) was applied simulate process estimate residual stress field. Growth cracks is driven crack intensities exceeding subcritical threshold intensity. subject plate experimentally...
Traditional Lamb wave structural health monitoring (SHM)/nondestructive evaluation (NDE) system employs contact type transducers such as PZT, ultrasonic transducers, and optical fibers. In application, transducer attachment maintenance can be time labor consuming. addition, the use of couplant adhesives introduce additional materials on structures, interface coupling is often not well understood. To overcome these limitations, we proposed a fully non-contact NDE by employing pulsed laser...
Abstract Composite materials are widely used in aerospace industries due to their light weight, strength, and various other desired properties. However, they susceptible defects occurring during the manufacturing process or service. Typical include porosity, wrinkles, delamination. Nondestructive means of detection at any stage great importance ensure quality safety composite structures. A nonintrusive removable Lamb wave system accompanied methodology that is not material dependent...
In this paper we present a structural health monitoring (SHM) paradigm based on the simultaneous use of ultrasounds and electromechanical impedance (EMI) to monitor waveguides. The uses guided ultrasonic waves (GUWs) in pitch-catch mode EMI simultaneously. two methodologies are driven by same sensing/hardware/software unit. To assess feasibility unified system an aluminum plate was monitored for varying damage location. Damage simulated adding small masses plate. results associated with GUW...
Composites have been extensively used in aerospace engineering due to their advantages of light weight, high strength, and design flexibility. Manufacturing defects such as wrinkle porosity can affect the performance composites may lead failure end, while damage delamination, fiber fraction, matrix cracking directly cause composites. In this paper, a Lamb wave based nonintrusive nondestructive evaluation system, which employs piezoelectric transducer for actuation scanning laser Doppler...
Composites have been extensively used in aero structure and become the predominate components new airframes. Thus, rapid effective inspection for composite structures is highly desired aerospace engineering order to shorten certificate cycle or provide safety guarantee existing ones. In this paper, a laser based remote Lamb wave system presented implemented on plates simulated damage detection. The employs pulsed (PL) scanning Doppler vibrometer (SLDV) noncontact actuation wavefield sensing....
Abstract Noncontact and remote NDE systems methods are highly desired in a broad range of engineering applications such as material property characterization. This paper aims to develop noncontact/remote system based on laser ultrasonic guided waves establish its fundamental capability for thickness evaluation. The noncontact employs pulsed (PL) wave actuation scanning Doppler vibrometer (SLDV) wavefield sensing. A cylindrical planoconvex lens is adopted focus the beam line source order...
Abstract Stress corrosion cracking (SCC) has been observed in the high-level nuclear waste tanks that were constructed by welding carbon steel plates. This paper aims to establish an ultrasonic inspection system and its fundamental ability for SCC quantification on thick welded A plate was fabricated without heat treatment joining two plates through gas metal arc (GMAW) procedure. growth, which initiated with starter cracks across weld, a few weeks after submerging 5 molar (5M) sodium...
This paper aims to study the working mechanism of pulsed laser generated ultrasonics on metallic surfaces as well evaluate pulse parameter effect waves. A thermoelastic model is adopted assuming that works in regime and illuminates a half space structure. Through Hankel-Laplace transform, surface temperature displacement are solved transformed frequency wavenumber domain. The numerical solutions then obtained through inverse transform. Laser epicenter studied, showing increase excitation...