Abstract:Adhesively bonded stiffeners are employed in aerospace applications to increase structural stiffness. The potential of feature-guided wave modes for the verification of adhesion and curing state in difficult-to-access regions has been investigated. The properties of guided wave modes propagating along a T-shaped stiffener bonded to an aluminium plate were calculated using the Semi-Analytical Finite Element (SAFE) method. Feature-guided modes dominated by shearing motion were identified to be well suited, with … Show more
“…ese methods have some disadvantages, and it is impossible to achieve safe and efficient nondestructive testing (NDT) of the welded structure. To address this problem, shear horizontal-(SH-) guided wave detection methods have been proposed [2,[11][12][13]. Due to the low dispersion of the SH wave, the SH-guided wave in the weld seam can achieve long-distance weld inspection [14] and multiple defects can be detected from a single scan [15].…”
e dispersion characteristics of shear horizontal-(SH-) guided waves in a weld seam are critical to identifying defects. By considering the force on the virtual boundary layer near the weld surface, a dispersion equation for the SH-guided wave in the weld seam was established here based on the peridynamics method. e wave dispersion equation is similar to the traditional theory. e SH wave in the infinite peridynamics medium has dispersion characteristics, and the group velocity of the SH-guided wave in the weld seam is slightly slower than that in the conventional theory. In the welded structure, the group velocity of the SHguided wave is unevenly distributed in different regions due to the differences in material parameters between the weld seam and the steel plate and residual weld height on the weld seam. e distance from the different sensors to the defect can be precisely calculated via the group velocity distribution; thus, the defect can be accurately located. By compared with the finite element method and experiments under the same conditions, the reliability of the peridynamics method is verified. We used the group velocity of the SH-guided wave in the weld seam and peridynamics theory to better reflect the experimental conditions versus finite element simulations.
“…ese methods have some disadvantages, and it is impossible to achieve safe and efficient nondestructive testing (NDT) of the welded structure. To address this problem, shear horizontal-(SH-) guided wave detection methods have been proposed [2,[11][12][13]. Due to the low dispersion of the SH wave, the SH-guided wave in the weld seam can achieve long-distance weld inspection [14] and multiple defects can be detected from a single scan [15].…”
e dispersion characteristics of shear horizontal-(SH-) guided waves in a weld seam are critical to identifying defects. By considering the force on the virtual boundary layer near the weld surface, a dispersion equation for the SH-guided wave in the weld seam was established here based on the peridynamics method. e wave dispersion equation is similar to the traditional theory. e SH wave in the infinite peridynamics medium has dispersion characteristics, and the group velocity of the SH-guided wave in the weld seam is slightly slower than that in the conventional theory. In the welded structure, the group velocity of the SHguided wave is unevenly distributed in different regions due to the differences in material parameters between the weld seam and the steel plate and residual weld height on the weld seam. e distance from the different sensors to the defect can be precisely calculated via the group velocity distribution; thus, the defect can be accurately located. By compared with the finite element method and experiments under the same conditions, the reliability of the peridynamics method is verified. We used the group velocity of the SH-guided wave in the weld seam and peridynamics theory to better reflect the experimental conditions versus finite element simulations.
“…Guided ultrasonic waves can propagate over long distances in structures that are thin in at least one dimension, providing an efficient way for the SHM of large structures [1,2]. High frequency guided waves have been employed to monitor fatigue crack growth at fastener holes [3][4][5][6] and to detect defects in multi-layered structures [7].…”
“…Efficient monitoring of the structural integrity of large areas of industrial structures can be achieved using guided ultrasonic wave array systems [3][4][5]. Guided ultrasonic waves can propagate over large distances in thin structures [6,7]. This allows for the nondestructive testing and monitoring of large technical structures [8].…”
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