Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Collinear nonlinear guided wave mixing for debonding detection in reinforced concrete beam using longitudinal and torsional wave modes
https://orcid.org/0000-0001-5339-2130
Highlights Nonlinear guided wave mixing for debonding damage in reinforced concrete beam. Longitudinal mode pairs with phase matching and synchronism condition are excited at rebar end. Generation of sum combinational harmonics in longitudinal and torsional wave modes at rebar end due to debonding. Increase in amplitude of sum combinational harmonics using phase reversal technique. Numerical simulations are performed with material nonlinearity to investigate the harmonics at the sum frequency. Debonding location estimation using wavenumber frequency analysis and phase reversal. Experimental studies are carried out to validate the numerical simulation model. Sum Combinational harmonics in torsional direction are more sensitive than longitudinal direction for excited mode pairs.
Abstract Nonlinear guided wave (GW) mixing of longitudinal wave is proposed to detect and locate debonding damage between rebar and concrete in the reinforced concrete beam. Two wave mode pairs are chosen based on phase matching and synchronism conditions for observing sum combinational harmonics, and longitudinal GW as the excitation signal while the longitudinal and torsional wave as the receiving signal. The study is carried out numerically and experimentally for bonded and debonded reinforced concrete specimens. For bonded specimens, second-order combinational harmonics are absent in all bonded cases. The contact effect due to debonding can generate second and higher-order combination harmonics. The indication of debonding damage is determined in debonded specimens by the presence of sum combinational harmonics. The use of the phase reversal approach in this study clearly observes the increase in the amplitude of the sum combinational harmonics in the debonded cases. By utilizing the phase reversal approach and wavenumber frequency analysis, the dominant longitudinal GW modes can be used to accurately determine the location of debonding. The amplitude of the nonlinear parameter of longitudinal and torsional GW modes increases with debonding length. In this study, the results show that the torsional GW modes have better performance than longitudinal GW modes for debonding detection because the torsional GW modes have larger amplitudes than the longitudinal GW modes.
Collinear nonlinear guided wave mixing for debonding detection in reinforced concrete beam using longitudinal and torsional wave modes
https://orcid.org/0000-0001-5339-2130
Highlights Nonlinear guided wave mixing for debonding damage in reinforced concrete beam. Longitudinal mode pairs with phase matching and synchronism condition are excited at rebar end. Generation of sum combinational harmonics in longitudinal and torsional wave modes at rebar end due to debonding. Increase in amplitude of sum combinational harmonics using phase reversal technique. Numerical simulations are performed with material nonlinearity to investigate the harmonics at the sum frequency. Debonding location estimation using wavenumber frequency analysis and phase reversal. Experimental studies are carried out to validate the numerical simulation model. Sum Combinational harmonics in torsional direction are more sensitive than longitudinal direction for excited mode pairs.
Abstract Nonlinear guided wave (GW) mixing of longitudinal wave is proposed to detect and locate debonding damage between rebar and concrete in the reinforced concrete beam. Two wave mode pairs are chosen based on phase matching and synchronism conditions for observing sum combinational harmonics, and longitudinal GW as the excitation signal while the longitudinal and torsional wave as the receiving signal. The study is carried out numerically and experimentally for bonded and debonded reinforced concrete specimens. For bonded specimens, second-order combinational harmonics are absent in all bonded cases. The contact effect due to debonding can generate second and higher-order combination harmonics. The indication of debonding damage is determined in debonded specimens by the presence of sum combinational harmonics. The use of the phase reversal approach in this study clearly observes the increase in the amplitude of the sum combinational harmonics in the debonded cases. By utilizing the phase reversal approach and wavenumber frequency analysis, the dominant longitudinal GW modes can be used to accurately determine the location of debonding. The amplitude of the nonlinear parameter of longitudinal and torsional GW modes increases with debonding length. In this study, the results show that the torsional GW modes have better performance than longitudinal GW modes for debonding detection because the torsional GW modes have larger amplitudes than the longitudinal GW modes.
Collinear nonlinear guided wave mixing for debonding detection in reinforced concrete beam using longitudinal and torsional wave modes
https://orcid.org/0000-0001-5339-2130
Highlights Nonlinear guided wave mixing for debonding damage in reinforced concrete beam. Longitudinal mode pairs with phase matching and synchronism condition are excited at rebar end. Generation of sum combinational harmonics in longitudinal and torsional wave modes at rebar end due to debonding. Increase in amplitude of sum combinational harmonics using phase reversal technique. Numerical simulations are performed with material nonlinearity to investigate the harmonics at the sum frequency. Debonding location estimation using wavenumber frequency analysis and phase reversal. Experimental studies are carried out to validate the numerical simulation model. Sum Combinational harmonics in torsional direction are more sensitive than longitudinal direction for excited mode pairs.
Abstract Nonlinear guided wave (GW) mixing of longitudinal wave is proposed to detect and locate debonding damage between rebar and concrete in the reinforced concrete beam. Two wave mode pairs are chosen based on phase matching and synchronism conditions for observing sum combinational harmonics, and longitudinal GW as the excitation signal while the longitudinal and torsional wave as the receiving signal. The study is carried out numerically and experimentally for bonded and debonded reinforced concrete specimens. For bonded specimens, second-order combinational harmonics are absent in all bonded cases. The contact effect due to debonding can generate second and higher-order combination harmonics. The indication of debonding damage is determined in debonded specimens by the presence of sum combinational harmonics. The use of the phase reversal approach in this study clearly observes the increase in the amplitude of the sum combinational harmonics in the debonded cases. By utilizing the phase reversal approach and wavenumber frequency analysis, the dominant longitudinal GW modes can be used to accurately determine the location of debonding. The amplitude of the nonlinear parameter of longitudinal and torsional GW modes increases with debonding length. In this study, the results show that the torsional GW modes have better performance than longitudinal GW modes for debonding detection because the torsional GW modes have larger amplitudes than the longitudinal GW modes.
Collinear nonlinear guided wave mixing for debonding detection in reinforced concrete beam using longitudinal and torsional wave modes
Aseem, Ahmed (Autor:in) / Ng, Ching Tai (Autor:in)
04.08.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch