An efficient three-dimensional adaptive quasicontinuum method using variable-node elements

  • Authors:

  • Sungjin Kwon;Youngmin Lee;Jong Youn Park;Dongwoo Sohn;Jae Hyuk Lim;Seyoung Im

  • Affiliations:

  • Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Science Town, Daejeon 305-701, Republic of Korea;Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Science Town, Daejeon 305-701, Republic of Korea;Technical Research Lab., POSCO, Pohang, Gyeongbuk, Republic of Korea;Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Science Town, Daejeon 305-701, Republic of Korea;Satellite Structure Department, Korea Aerospace Research Institute, 115 Gwahangno 45, Eoeun-dong, Yuseong-gu, Daejeon 305-333, Republic of Korea;Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Science Town, Daejeon 305-701, Republic of Korea

  • Venue:
  • Journal of Computational Physics
  • Year:
  • 2009

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Abstract

A new quasicontinuum (QC) implementation using the so-called ''variable-node finite elements'' is reported in this work. Tetrahedral elements, which have been exclusively utilized for the conventional QC are replaced by hexahedral elements in conjunction with the so-called variable-node elements. This enables an effective adaptive mesh refinement in QC, leading to fast and efficient simulations compared with the conventional QC. To confirm the solution accuracy, comparison is made for a nanoindentation problem with a molecular dynamics simulation as well as a molecular mechanics solution. Further examples of nanoindentation are shown and discussed to demonstrate the effectiveness of the present scheme.