Damage detection in bent plates using shear horizontal guided waves

Nakash Nazeer; Madis Ratassepp; Zheng Fan

doi:10.1016/j.ultras.2016.11.020

Damage detection in bent plates using shear horizontal guided waves

Ultrasonics. 2017 Mar:75:155-163. doi: 10.1016/j.ultras.2016.11.020. Epub 2016 Nov 29.

Authors

Nakash Nazeer¹, Madis Ratassepp¹, Zheng Fan²

Affiliations

¹ School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
² School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. Electronic address: ZFAN@ntu.edu.sg.

PMID: 27951504
DOI: 10.1016/j.ultras.2016.11.020

Abstract

Study of the interaction of shear horizontal guided mode with defects in the bend region of an isotropic top hat stiffener is presented. Compared with the SH0 wave in a plate, the shear mode in the bend is dispersive and its wavefield characteristics are affected by the curvature of the bend. The scattering studies showed that the sensitivity of the wave to outer surface cracks in the bend increases with increasing frequency compared to inner surface cracks. Further numerical simulations demonstrated that the shear mode is sensitive to the delamination in the bend due to non-zero transverse shear stress. Results of finite element modeling were validated by experiments and reasonably good agreements were obtained.

Keywords: Curvature effect; Defect scattering; Shear horizontal mode.

Publication types

Research Support, Non-U.S. Gov't