Year: 2025
Type: conference-paper
Abstract: During manufacturing or service processes, laminated beams can experience debondings, which is a typical form of barely visible damage. Accurately localizing debondings of laminated beams is crucial for maintaining structural integrity. Within the scope of linear vibration, the existing linear interface forces (LIFs), which are distributed along interfaces between two layers of a laminated beam feature the capability of locating open debondings, but are not applicable to breathing debondings with contact behaviours. To address this problem, this study extends the LIFs to the realm of nonlinear vibration, by which the nonlinear interface forces (NIFs) are formulated based on the equations of the nonlinear transverse motions of beam elements. In contrast to the LIFs, which appear in intact regions only and vanish within open debonding regions, the NIFs proposed in this study appear exclusively in breathing debonding regions, acting as multi-tone harmonic excitation sources to produce higher harmonics. This study highlights the use of NIFs for the localization of debondings in laminated beams due to their inherent merit of localization. The NIFs are reconstructed from nonlinear operating deflection shapes of a laminated beam in the absence of its material and structural parameters. The capability of the NIF approach for localizing breathing debondings in laminated beams is experimentally validated through laser scanning. The results reveal that the approach is capable of characterizing the occurrence, locations, and sizes of debondings.
DOI: 10.58286/31062
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Funder: China Scholarship Council
OpenAlex ID: W4409730597