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Dynamic crushing behavior of functionally graded honeycomb structures with random defects

Abstract In the present work, the in-plane dynamic crushing behavior of functionally graded honeycomb structures with missing-wall defects is investigated. To study the influences of the functionally graded properties on dynamic crushing, a density gradient is introduced by changing the cell wall thicknesses along the impact direction. Results show that both the deformation mode and energy absorption are sensitive to the density gradient. However, the deformation mode displays less dependence on the density gradient when the honeycomb is impacted at a high velocity. Furthermore, the effects of defect ratios and defect locations are discussed. Results reveal that the larger defect ratio is responsible for the lower energy absorption. For the case of 70 m s−1 impact velocity, defects in the middle of the structure should be avoided, as they lead to inferior energy absorption.