Numerical Study on Impact Resistance of Nonuniform Nacre-patterned Multi-layer Structures

Tae Hee Lee; Kwonhwan Ko; Jung-Wuk Hong

doi:10.7734/COSEIK.2022.35.4.215

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2022 Vol.35, Issue 4 Preview Page Next Page

Research Paper

Numerical Study on Impact Resistance of Nonuniform Nacre-patterned Multi-layer Structures 비균일 진주층 모사 다층형 복합재료의 내충격성에 관한 수치해석

31 August 2022. pp. 215-226

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Abstract

Significant efforts have been devoted to developing high-performance composite materials by emulating the structure of biological creatures with superior mechanical characteristics. Nacre has been one of the most sought-after natural structures due to its exceptional fracture toughness compared with the constituent materials. However, the effect of manipulating the nacre-like geometry on the impact performance has not been fully investigated thus far. In this study, composites of randomly manipulated nacreous geometry are numerically developed and the impact performance is analyzed. We develop an algorithm by which the planar area of platelets in the nacre-like design is randomly resized. Thereafter, the numerical models of nonuniform nacre-patterned multi-layer structures are developed and the drop-weight impact simulation is performed. The impact behaviors of the model are evaluated by using the ratio of absorbed energy, the von Mises stress distribution, and the impact force-time curve. Therefore, the effect of the geometric irregularity on the nacre-patterned design is elucidated. This insight can be efficiently utilized in establishing the optimum design of the nacre-patterned structure.

Keywords

nacre-patterned multi-layer structure

nonuniform pattern

drop-weight impact simulation

impact resistance

우수한 역학적 성능을 가진 생물체의 구조를 모방하여 고성능의 복합재료를 개발하려는 노력이 최근 활발히 이뤄지고 있다. 진주층 구조는 구성재료 대비 월등히 높은 파괴인성을 지닌다는 점에서 촉망받는 자연 모사 구조 중 하나이다. 하지만, 진주층 모사 구조의 형상이 변형될 때 구조의 충격성능이 어떻게 달라지는지에 관한 연구는 아직 충분히 진행되지 않았다. 본 연구에서는 무작위로 변형된 진주층 모사 복합재의 수치모델을 개발하고 충격성능을 분석하였다. 먼저, 균일한 진주층 모사 패턴에서 플레이트 판의 평면 크기를 무작위로 변형하는 알고리즘을 개발하고 이를 활용하여 불균일한 진주층 패턴 모사 구조를 모델링하였다. 그 후, 낙하충격 시뮬레이션을 수행하고 해당 모델의 충격거동을 에너지 흡수율과 본 미세스 응력 분포, 충격력-시간 그래프를 활용하여 평가하였다. 수치해석결과를 바탕으로, 충돌 범위 주변 플레이트 판의 기하학적 형상이 불균일할수록 진주층 모사 구조의 내충격성이 저하됨을 입증하였다. 이러한 진주층 모사 형상에 대한 심층적인 이해는 진주층 모사 구조의 최적설계를 수립하는 데 효율적으로 활용될 수 있을 것으로 기대된다.

키워드

진주층 모사 다층형 복합재료

패턴 비균일화

낙하충격해석

내충격성

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 35
No :4
Pages :215-226
Received Date : 2022-05-06
Revised Date : 2022-06-21
Accepted Date : 2022-07-05
DOI :https://doi.org/10.7734/COSEIK.2022.35.4.215

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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