Imperfection Mode of Thin Metallic Sandwich Plate with Pyramidal Metallic Inner Structures

피라미드형 금속 내부구조체를 가진 얇은 금속샌드위치 판재의 결함 모드

  • Received : 2012.06.13
  • Accepted : 2013.01.11
  • Published : 2013.02.04


Thin metallic sandwich plate with pyramidal metallic inner structures is manufactured from a continuous projection welding between face sheets and inner structures. Due to the welding pressure, imperfections of inner structures induced by the deformation of the inner structures occur. The imperfections affect the response of the thin metallic sandwich plate subjected to low-velocity impact loading. The goal of this paper is to obtain a proper dominant imperfection mode of the thin metallic sandwich plate with pyramidal metallic inner structures. The variation of impact responses of the thin metallic sandwich plate for different imperfection modes are investigated by finite element analysis. The results of the FE analysis are compared to those of drop impact experiments. From the results of the comparison, it has been shown that the dominant imperfection mode of the thin metallic sandwich plate with pyramidal metallic inner structures is all type of symmetric imperfection mode with symmetrical imperfections of four struts.


Imperfection Mode;Thin Metallic Sandwich Plate;Pyramidal Metallic Inner Structures;Finite Element Analysis;Impact Response


Supported by : 한국연구재단


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