Dr. Haichang Gu Profile

Dr. Haichang Gu

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Publications (8)

Proceedings Article | 12 April 2010 Paper

A one-dimensional rate-dependent constitutive model for thermomechanical behavior of superelastic shape memory alloys

Hui Qian, Wenjie Ren, Huai Chen, Haichang Gu, Sihua Zhang

Proceedings Volume 7643, 76430F (2010) https://doi.org/10.1117/12.847001

KEYWORDS: Shape memory alloys, Temperature metrology, Atrial fibrillation, Numerical simulations, Data modeling, Civil engineering, Instrument modeling, Reverse modeling, Curium, Data acquisition

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Proceedings Article | 9 April 2010 Paper

Health monitoring of concrete piles using piezoceramic-based smart aggregates

Gangbing Song, Haichang Gu, Y. Mo, Ruoling Wang

Proceedings Volume 7650, 76500X (2010) https://doi.org/10.1117/12.847827

KEYWORDS: Sensors, Actuators, Ferroelectric materials, Transducers, Wave propagation, Acoustics, Signal attenuation, Damage detection, Wavelets, Optical fibers

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Proceedings Article | 20 April 2007 Paper

Derivation and simulation of an improved two-dimensional constitutive law for shape memory alloys

Wei Wang, Shi Yan, Gangbing Song, Haichang Gu

Proceedings Volume 6526, 65262P (2007) https://doi.org/10.1117/12.714709

KEYWORDS: Shape memory alloys, Chromium, Temperature metrology, Thermodynamics, Numerical simulations, Mechanics, Systems modeling, Data modeling, Curium, Actuators

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Proceedings Article | 19 April 2007 Paper

Seismic response control of frame structure braced with SMA tendons

Shi Yan, Gangbing Song, Linsheng Huo, Haichang Gu

Proceedings Volume 6529, 65292H (2007) https://doi.org/10.1117/12.714505

KEYWORDS: Shape memory alloys, Earthquakes, Finite element methods, Motion models, Chromium, Computer simulations, Numerical simulations, Sensors, Complex systems, Matrices

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Proceedings Article | 6 April 2006 Paper

Development and characterization of carbon nanopaper-based nanocomposite materials

Jihua Gou, Scott O'Braint, Haichang Gu, Gangbing Song

Proceedings Volume 6170, 61701O (2006) https://doi.org/10.1117/12.661286

KEYWORDS: Carbon, Nanofibers, Nanocomposites, Composites, Glasses, Scanning electron microscopy, Carbon nanotubes, Polymers, Nanolithography, Structured optical fibers

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Proceedings Article | 16 March 2006 Paper

Early age strength monitoring of concrete structures using embedded smart piezoelectric transducers

H. Gu, G. Song, H. Dhonde, Y. L. Mo, S. Yan

Proceedings Volume 6179, 61790H (2006) https://doi.org/10.1117/12.668017

KEYWORDS: Fuzzy systems, Fuzzy logic, Sensors, Cements, Transducers, Ultrasonics, Associative arrays, Capacitance, Nondestructive evaluation, Actuators

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Proceedings Article | 17 May 2005 Paper

Health monitoring of a concrete structure using piezoceramic materials

G. Song, H. Gu, Y. L. Mo, T. Hsu, H. Dhonde, R. R. H. Zhu

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.602658

KEYWORDS: Actuators, Wavelets, Sensors, Ferroelectric materials, Microscopes, Bridges, Transducers, Composites, Analytical research, Smart materials

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Health monitoring for reinforced concrete bridges and other large-scale civil infrastructure has received considerable attention in recent years. Traditional inspection methods (x-ray, C-scan etc.) are expensive and sometimes ineffective for large-scale structures. Piezoceramic transducers have emerged as new tools to health monitoring of large size structures due to the advantages of active sensing, low cost, quick response, availability in different shapes, and simplicity for implementation. In this research, piezoceramic transducers in the form of patches are used to detect internal cracks of a 6.1-meter long reinforced concrete bridge bent-cap. Piezoceramic patches are embedded in the concrete structure at pre-determined spatial locations prior to casting. This research can be considered as a continuation of an early work, where four piezoceramic patches were embedded in planar locations near one end of the bent-cap. This research involves ten piezoceramic patches embedded at spatial locations in four different cross-sections. To induce cracks in the bent-cap, the structure is subjected to loads from four hydraulic actuators with capacities of 80-ton and 100-ton. In addition to the piezoceramic sensors, strain gages, LVDTs, and microscopes are used in the experiment. During the experiment, one embedded piezoceramic patch is used as an actuator to generate sweep sinusoidal waves, and the other piezoceramic patches are used as sensors to detect the propagating waves. With the increase of number of and severity of cracks, the magnitude of the sensor output decreases. Wavelet packet analysis is used to analyze the recorded sensor signals. A damage index is formed on the basis of the wavelet packet analysis. The experimental results show that the proposed methods using piezoceramic transducers along with the damage index based on wavelet packet analysis is effective in identifying the existence and severity of cracks inside the concrete structure. The experimental results also show that the proposed method has the ability to predict the failure of concrete as verified by results from conventional microscopes (MS) and LVDTs.

Proceedings Article | 20 July 2004 Paper

Delamination detection of composite plates using piezoceramic patches and wavelet packet analysis

Haichang Gu, Gangbing Song, Pizhong Qiao

Proceedings Volume 5393, (2004) https://doi.org/10.1117/12.548828

KEYWORDS: Composites, Wavelets, Ferroelectric materials, Sensors, Wavelet transforms, Actuators, Analytical research, Signal analyzers, Aerospace engineering, Neural networks

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Showing 5 of 8 publications

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