Abstract

Lattice truss core sandwich panels are widely applied in transportation, automobile, aircraft and aerospace industries for their outstanding characteristics and excellent designable properties. However, only a little work concentrates on their non-destructive testing (NDT) methods. In this paper, based on vibration and continuous wavelet transform (CWT), a baseline-free NDT method is proposed for damage identification in lattice truss core sandwich panels. Firstly, the special mode shapes are chosen and the 2D CWT is applied to process the mode curvatures. Then, considering the periodicity, which is the instinct characteristic of lattice truss core sandwich panel, a damage index is defined by a combination of the structural periodicity and the coefficients of CWT. Finally, numerical simulations and experimental tests are conducted for damage identification in sandwich panels. Results show that the proposed method is efficient and reliable, and has a good identification resolution for one or more truss core bars missing detection without a baseline. It indicates the proposed method has an applicable potential in damage detection of sandwich panels.

How to Cite:

Zhou, J. . & Li, Z. ., (2019) “Damage identification method based on vibration for lattice truss core sandwich panels”, Review of Progress in Quantitative Nondestructive Evaluation .