Quasicontinuum method using variable-node elements and its applications for simulations of nanostructures = 변절점 요소를 이용한 준연속체 방법 및 나노 구조물 변형 모사에의 응용

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A new three-dimensional adaptive quasicintinuum (QC) method is studied to improve the conventional QC that utilizes tetrahedral elements. The linear tetrahedral elements of the conventional QC are replaced by hexahedral elements, and the adaptive refinement is achieved by utilizing what is known as variable-node elements. This leads to a substantial improvement in the solution convergence in the adaptive QC method, and removes the need of an extra code for the constrained Delaunay triangulation, which is required in the course of adaptive mesh refinement in the conventional QC with tetrahedral elements. The new QC scheme is firstly applied for simulations of Al (111) nanoindentation to explore the load-displacement behavior, and the effect of a void on the response to indentation. Secondly, the method is extended for application to the case of a curved crystalline structure like a carbon nanotube (CNT) to study deformation behaviors of CNTs. Numerical examples demonstrate the effectiveness and the accuracy of the new QC with the proposed hexahedral-type or variable-node elements.
Advisors
Im, Se-Youngresearcher임세영researcher
Description
한국과학기술원 : 기계공학전공,
Publisher
한국과학기술원
Issue Date
2009
Identifier
308972/325007  / 020037037
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학전공, 2009.2, [ vii, 115 p. ]

Keywords

Quasicontinuum; Variable-node elements; Multiscale modeling; Nanoindentation; Adaptive mesh refinement; 준연속체; 변절점 요소; 다중스케일 모델링; 나노인덴테이션; 적응 요소 세분화; Quasicontinuum; Variable-node elements; Multiscale modeling; Nanoindentation; Adaptive mesh refinement; 준연속체; 변절점 요소; 다중스케일 모델링; 나노인덴테이션; 적응 요소 세분화

URI
http://hdl.handle.net/10203/43361
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=308972&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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