As a kind of super-light lattice material, the sandwich plate with pyramidal truss cores has wide application prospect. In this paper, a vibration parameter based nondestructive testing method using Uniform Load Surface (ULS) curvature was proposed to detect the delamination defects of the pyramid-type lattice sandwich plate. The feasibility of the approach is that the surface smoothing method and curvature mode change rate method are adopted to overcome the dependence on the unflawed model. The validity and efficiency of the proposed methods were demonstrated through numerical simulations.
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