1,721,042 research outputs found
Niching particle swarm optimization techniques for multimodal buckling maximization of composite laminates
No full textAbstract not availableLiang Huang, Ching-Tai Ng, Abdul H. Sheikh, Michael C. Griffit
Second harmonic generation at fatigue cracks by low-frequency Lamb waves: experimental and numerical studies
Full text linkAbstract not availableYi Yang, Ching-Tai Ng, Andrei Kotousov, Hoon Sohn, Hyung Jin Li
Mechanics and Evaluation of Early Damage
Full text linkProceedings of the ICMFM XIXThis chapter describes the microstructural mechanisms leading to damage and the formation of fatigue cracks as well as the methods available to monitor these processes. The evaluation of early damage is especially important for structures with long service life spans, where the crack nucleation stage can dominate the total fatigue life.Andrei Kotousov, James Vidler, James Hughes, Aditya Khanna, Ching-Tai Ng and Munawwar Mohabut
Debonding detection in FRP-strengthened concrete structures utilising nonlinear Rayleigh wave mixing
No full textThis paper reports an investigation on the use of Rayleigh wave mixing method for the debonding detection in concrete structures strengthened with externally bonded fibre-reinforced polymer (FRP) composite plates. A three-dimensional (3D) finite element model is developed to simulate the propagation of Rayleigh waves in FRPstrengthened concrete structures. In this model, the frequency domain of the transmitted waves shows the generation of second harmonics and combinational harmonics on account of debonding. The numerically simulated results are then experimentally validated with carbon fibre-reinforced polymer (CFRP)-plated concrete blocks containing two different sizes of debonding. Based on the experimentally verified numerical model, parametric studies are then conducted, where a nonlinear debonding crack growth parameter is proposed. The nonlinear Rayleigh wave mixing method is proven to be practical, reliable, and sensitive for detecting debonding at bonded concrete-FRP interfaces in FRP-strengthened reinforced concrete (RC) structures.Yuqiao Cao, Ching Tai Ng, Scott T. Smit
Seismic Fragility Models for Unbraced Steel Pallet Racks
No full textRecent Italian earthquakes revealed the significant seismic vulnerability of industrial pallet racks designed for gravity loads only. Nevertheless, these structures remain the most common industrial storage system. Therefore, this study aims to determine the seismic fragility of such structural systems, facilitating more accurate enterprise risk assessments and the development of effective retrofit strategies. To this end, 3D non-linear models of 27 unbraced pallet racks, representative of those used in Italy, were subjected to Time-History analysis under 268 bidirectional seismic events, representative of the Italian seismicity. Multiple fragility models were then developed using various engineering demand parameters and seismic intensity measures through a cloud-based approach
Special issue on Structural Health Monitoring of Civil Structures
Full text linkChing-Tai Ng, Tommy H.T. Cha
Detection of multiple cracks on obstructed structural members by measured dynamic responses
No full textH. F. Lam, Ching-Tai Ng, H. M. Cho
Special issue on structural identification and monitoring with dynamic data
No full textPreface. Special issue S1 April 2015Dr. Ching-Tai Ng, Prof. Siu-Kui A
A model-based method for damage detection with guided waves
Full text linkAbstract not availablePouria Aryan, Andrei Kotousov, Ching-Tai Ng and Benjamin Cazzolat
Natural fibre composites made solely from the Castor plant for aircraft cabin interior materials
No full textMichael T. Heitzmann, Ching-Tai Ng, Benjamin Lindenberger, Martin Veidt, MengHou and Rowan Pato
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