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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Implementation of arbitrary polyhedral elements for automatic dynamic analyses of three-dimensional structures.

Lei Zhou1,2, Jianbo Li3,4, Gao Lin1,2

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This study introduces a novel polyhedron element for ABAQUS, enabling automatic dynamic analysis of complex 3D structures. This Scaled Boundary Finite Element Method (SBFEM) approach enhances accuracy and efficiency, reducing computational demands.

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Area of Science:

  • Computational Engineering
  • Structural Analysis
  • Finite Element Methods

Background:

  • Automated mesh generation for complex 3D structures from CAD models is challenging and time-consuming.
  • Current methods require significant manual intervention, limiting automatic engineering analyses.
  • The Scaled Boundary Finite Element Method (SBFEM) offers potential for improved analysis efficiency.

Purpose of the Study:

  • To implement a user-defined element (UEL) for arbitrary convex polyhedron elements in ABAQUS.
  • To enable seamless and automatic dynamic analyses of 3D structures directly from CAD geometry.
  • To enhance the capabilities of ABAQUS for advanced structural simulations.

Main Methods:

  • Implementation of a polyhedron element with arbitrary convex topology using the Scaled Boundary Finite Element Method (SBFEM).
  • Integration into ABAQUS via the user-defined element (UEL) subroutine.
  • Verification through comparative analysis of a cantilever beam under harmonic excitation against hexahedron elements.
  • Application to a practical Soil-Structure Interaction analysis for a Nuclear Power Plant.

Main Results:

  • The implemented polyhedron element in ABAQUS demonstrates robust and compatible performance.
  • The SBFEM-based polyhedron element achieves higher accuracy with fewer degrees of freedom compared to traditional hexahedron elements.
  • Automatic dynamic analysis from CAD geometry is successfully demonstrated.

Conclusions:

  • The UEL implementation for SBFEM polyhedron elements significantly advances automatic dynamic analysis in ABAQUS.
  • This method offers a more accurate and computationally efficient alternative for analyzing complex 3D structures.
  • The approach is suitable for practical engineering applications, including Soil-Structure Interaction analysis.