Auxetic structure and design method thereof

An auxetic structure of the present invention has a plurality of first and second bodies alternately arranged in a snap-through structure, and is provided to be deformable at a negative Poisson's ratio between a first state in which the plurality of first and second bodies are in close contact with each other and a second state in which the plurality of first and second bodies are spread apart from each other to form an open space. A method for designing the auxetic structure comprises the steps of: meshing a three-dimensional target surface; projecting an auxetic structure in any one of the first and second states onto the meshed target surface; determining design variables and constraints so that the plurality of projected first and second bodies can be in another state in a two-dimensional plane; and determining the value of the design variable by performing optimization with the design variable and the constraint. Therefore, provided are the auxetic structure with improved structure and the method for designing the same. 본 오그제틱구조는, 복수의 제 1, 2 몸체가 스냅스루구조로 교번되게 배치되며, 복수의 제 1, 2 몸체가 밀착된 제 1 상태와, 상기 복수의 제 1, 2 몸체가 벌어져 개방공간이 형성된 제 2 상태간을 음의 프아송비로 변형가능하게 구성된다. 본 오그제틱 구조의 설계방법은 3차원 타겟면을 메쉬화하는 단계와, 메쉬화된 타겟면에 제 1, 2 상태 중 어느 하나의 상태의 오그제틱 구조를 투영하는 단계와, 투영된 복수의 제 1, 2 몸체가 2차원 평면에서 다른 하나의 상태가 될 수 있도록, 설계변수와 제약조건을 결정하는 단계와, 설계변수와 제약조건으로 최적화를 수행하여 상기 설계변수값을 결정하는 단계를 포함한다.