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논문 기본 정보

자료유형
학술대회자료
저자정보
(Ulsan National Institute of Science and Technology) (Ulsan National Institute of Science and Technology) (Ulsan National Institute of Science and Technology) (Ulsan National Institute of Science and Technology)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2014년도 CAE 및 응용역학부문 춘계학술대회 논문집
발행연도
수록면
17 - 18 (2page)

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초록· 키워드

With the rapid advances in nano-structure materials, understanding mechanical behavior of nanostructures is essential. It is well-known that, due to the large surface-to-volume ratio of nanostructures, their material properties are tremendously influenced by surface effects and size effects. For example, surface stress in extremely thin FCC metal nanowires can be strong enough to induce a phase transformation in the nanowires [1]. Also, those extremely thin nanowires can exhibit sharp memory and pseudoelasticity behaviors because of surface effects [2], [3]. Resonant and critical electric potentials for bulking of clamped-clamped piezoelectricity nanoplates are changed significantly by surface piezoelectricity [4]. In this report, we show another typical example of surface effects: negative Poisson’s ration can be found in metal nanoplates. This interesting property is the result of a phase transformation induced by intrinsic instability and a compressive stress induced by surface effects [5]. The Poisson’s ratio behavior of such nanoplates strongly depends on their thickness because the compressive stress is a function of nanoplate thickness and applied strain. Poisson’s ratio is defined as the negative ratio between changes of strain along an orthogonal direction to change of strain along the loading direction. Under stretching, negative Poisson’s material expands in the direction orthogonal to the applied load instead of compressing like positive Poisson’s ratio material does. Negative Poisson’s ratio materials (also known as auxetics) have been studying sine the seminal work about auxetic behavior of reentrant foam structure in 1987 [6]. Auxetics can also be found in composites [7], zeolites [8], and some animal skins [9]. Beside metal nanoplates, we also so that cubic materials can show negative P ... 전체 초록 보기
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