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Bonded composites are widely used in various fields including civil and aerospace engineering.Strength and damage behavior of a sandwich structure are vital for the sustainable service of bonded composites.In this paper,the finite element method(FEM)is employed for analyzing the strength of a bonded sandwich beam with corrugated core.The adhesive layer(AL)is discretized and modeled with beam elements.A strength criterion and stiffness degeneration law of an AL is proposed.Effects of the configuration of the corrugated core on structural strength are investigated using a representative beam model containing three panels bonded with two corrugated layers.In this work,two major geometrical parameters of the core are considered: the angle between the oblique side and the horizontal bonded side of the corrugated layer and the overlap length of the two corrugated layers on both sides of the central panel.Numerical results obtained from 3-point bending tests show that the beam structure possesses maximum strength when the angle equals 90? and the overlap length of two corrugated layers is equal to the length of the horizontal bonded side of the corrugated layer.The crack expansion in ALs is also analyzed.It is found that the possibility of crack expansion on the boundary of an ALs is clearly higher than that within the AL.Furthermore,the ductility of a bonded structure can be improved by enhancing the strength of the AL boundary.