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A four-node C\(^{0}\) tetrahedral element based on the node-based smoothing technique for the modified couple stress theory

Abstract

In this paper, a four-node \(C^{0}\) tetrahedral element for the modified couple stress theory is proposed. Since the governing equations are the fourth-order differential equations, the first-order derivative of displacement or rotation should be approximated by a continuous function. In the proposed element, nodal rotations are defined using the node-based smoothing technique. Continuous rotation fields are defined with the shape functions and nodal rotations. Both the displacement field and the rotation field are expressed solely in terms of the displacement degrees of freedom. The element stiffness matrix is calculated using the newly defined rotation field. To prevent the increase of calculation cost due to increase of the bandwidth of the stiffness matrix, the preconditioned conjugate gradient method is introduced. The performance of the proposed element is evaluated through various numerical examples.

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Acknowledgements

GDS and JHC were supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1C1C1003724) and Creative Materials Discovery Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT (No .NRF-2019M3D1A1079229). GDS also acknowledges support by the KAI-NEET, KAIST, Korea.

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Choi, JH., Sim, GD. & Lee, BC. A four-node C\(^{0}\) tetrahedral element based on the node-based smoothing technique for the modified couple stress theory. Comput Mech 65, 1493–1508 (2020). https://doi.org/10.1007/s00466-020-01831-3

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Keywords

  • Finite element method
  • Node-based smoothed finite element method
  • Size effect
  • Modified couple stress theory
  • Tetrahedral element
  • Preconditioned conjucate gradient method